液化石油气铜片腐蚀试验法
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液化石油气G B11174液化石油气 GB 11174-891.主题内容与适用范围本标准规定了由石油炼厂生产的液化石油气的技术条件。
本标准所属的产品适用于作工业和民用燃料。
2.引用标准GB5842 液化石油气钢瓶GB6602 工业用裂解碳四蒸气压的测定雷德法ZB E46001 液化石油气密度或相对密度测定法(压力密度计法)ZB B46002 液化石油气总硫测定法(电量法)SY2081 液化石油气组成测定法(色谱法)SY2083 液化石油气铜片腐蚀试验法SY2084 液化石油气采样法SY7509 液化石油气残图物测定法CJ2-81 液化石油气钢瓶角阀3.技术要求┏━━━━━━━━━━━━━━━━━━┯━━━━━━━┯━━━━━━━┓┃项目│质量指标│实验方法┃┠──────────────────┼───────┼───────┨┃密度(15℃),KG/M3 │报告│ ZBE 46001 ┃┠──────────────────┼───────┼───────┨┃蒸气压(37.8℃),KPA 不大于│ 1380 │ GB 6602 ┃┠──────────────────┼───────┼───────┨┃C5及C5以上组分含量,%(V/V)不大于│ 3.0 │ SY 7509 ┃┠──────────────────┼───────┼───────┨┃残留物││ SY7509 ┃┠──────────────────┼───────┼───────┨┃蒸发残留物,ML/100ML │报告│┃┠──────────────────┼───────┼───────┨┃油渍观察值,ML │报告│┃┠──────────────────┼───────┼───────┨┃铜片腐蚀,级不大于│ 1 │ SY 2083 ┃┠──────────────────┼───────┼───────┨┃总硫含量,MG/M3 不大于│ 343 │ ZB E46002 ┃┠──────────────────┼───────┼───────┨┃游离水│无│目测1)┃┗━━━━━━━━━━━━━━━━━━┷━━━━━━━┷━━━━━━━┛注:①为确保液化石油气的使用安全,液化石油气要求有特殊气味,必要时加入硫醇、硫醚等含硫化物配制的加臭剂。
第1篇一、实验目的本实验旨在通过铜片腐蚀试验,测定不同油品对铜片的腐蚀程度,了解油品的腐蚀性能,为油品的选择和使用提供参考。
二、实验原理铜片腐蚀试验是一种定性方法,主要用于测定油品中腐蚀金属的活性硫化物和元素硫。
试验原理是将磨光的标准尺寸的铜片浸入油中,在一定温度和时间条件下保持,然后取出与未浸油的铜片比较其表面颜色,根据浸过油试片所呈现的绿色、黑色、棕黑色或钢灰色斑点确定腐蚀级别。
三、实验仪器与试剂1. 仪器:铜片腐蚀测定仪、恒温水浴锅、电子天平、计时器、移液管、玻璃试管、标准色板等。
2. 试剂:待测油品、蒸馏水、标准铜片。
四、实验步骤1. 准备工作:将标准铜片用蒸馏水洗净、晾干,并置于干燥器中保存。
2. 标准溶液制备:按照实验要求,将标准油品加入试管中,用移液管移取一定量的油品至试管中,再加入适量的蒸馏水,充分混合。
3. 铜片处理:将标准铜片用蒸馏水洗净、晾干,然后放入油浴锅中,调整温度至规定值。
4. 浸泡:将制备好的标准溶液倒入试管中,将铜片浸入溶液中,计时。
5. 取出:根据实验要求,保持铜片在溶液中的时间,然后取出铜片。
6. 观察与记录:将取出后的铜片与未浸油的铜片进行比较,观察表面颜色变化,记录腐蚀级别。
7. 结果分析:根据标准色板,确定铜片的腐蚀级别。
五、实验结果与分析1. 实验结果:根据实验观察和记录,得到不同油品的腐蚀级别如下:(1)油品A:腐蚀级别为1级(2)油品B:腐蚀级别为2级(3)油品C:腐蚀级别为3级2. 结果分析:通过对比不同油品的腐蚀级别,可以发现,油品A的腐蚀性能最好,油品C的腐蚀性能最差。
这可能与油品的成分、添加剂等因素有关。
六、实验结论本实验通过对不同油品进行铜片腐蚀试验,得出以下结论:1. 铜片腐蚀试验是一种有效的定性方法,可以用于测定油品的腐蚀性能。
2. 油品的腐蚀性能与其成分、添加剂等因素有关。
3. 在选择和使用油品时,应考虑其腐蚀性能,以避免对设备造成损害。
发布时间:2011年12月30日实施时间:2012年07月01日规范号:GB 11174—2011发布单位:中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会前言本标准第4章、第6章为强制性的,其余为推荐性的。
本标准修改采用ASTM D 1835—2005《液化石油气规范》(英文版)制定。
本标准根据ASTM D 1835—2005重新起草。
本标准与ASTM D 1835—2005标准的主要技术性差异如下:——由于本标准所属产品主要适用于作工业和民用燃料,不适用于作内燃机燃料,所以本标准不包括ASTM D 1835—2005中的“专用丙烷”品种(见本版中表1,ASTM D 1835—2005中表1);——由于国内液化石油气组分中不仅含有烷烃,还含有烯烃组分,因此考虑国内实际情况,本标准将ASTM D 1835—2005中的“丁烷及以上组分”和“戊烷及以上组分”分别改为“C4及C4以上组分”和“C5及C5以上组分”,并将“商品丙丁烷混合物”的“C5及C5以上组分”指标由“不大于2.0%(体积分数)”改为“不大于3.0%(体积分数)”(见本版中表1,ASTM D 1835—2005中表1);——本标准适用于我国炼厂和油气田生产的液化石油气,为了与市场上掺混气区别,对“商品丙烷”,增加“C3烃类组分”指标“不小于95%”,对“商品丁烷”和“商品丙丁烷混合物”,增加“C3+C4烃类组分”指标“不小于95%”(见本版中表1);——为了保证在最高使用温度下容器内液化石油气的压力小于容器的工作压力,“丙丁烷混合物”的“蒸气压”指标由“表注B”改为“不大于1380kPa”(见本版中表1,ASTM D 1835—2005中表1);——考虑到我国习惯,“总硫含量”的单位由“ppm”改为本标准的“mg/m3”,并根据国内生产情况将“总硫含量”指标减少约10mg/m3(见本版中表1,ASTM D 1835—2005中表1);——国内生产企业均控制游离水,根据国内实际情况,本标准“商品丙烷”增加了“游离水”指标,取消了“湿度”指标(见本版中表1,ASTM D 1835—2005中表1)。
Designation:D130–04e1Designation:154/93An American National StandardFederation of Societies for Paint Technology Standard No.Dt-28-65British Standard4351Standard Test Method forCorrosiveness to Copper from Petroleum Products by Copper Strip Test1This standard is issued under thefixed designation D130;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.e1N OTE—Paragraphs11.1.2and11.1.3were editorially corrected to match Table1and ADJD0130.1.Scope1.1This test method covers the determination of the corro-siveness to copper of aviation gasoline,aviation turbine fuel, automotive gasoline,cleaners(Stoddard)solvent,kerosine, diesel fuel,distillate fuel oil,lubricating oil,and natural gasoline or other hydrocarbons having a vapor pressure no greater than124kPa(18psi)at37.8°C.(Warning—Some products,particularly natural gasoline,may have a much higher vapor pressure than would normally be characteristic of automotive or aviation gasolines.For this reason,exercise extreme caution to ensure that the pressure vessel used in this test method and containing natural gasoline or other products of high vapor pressure is not placed in the100°C(212°F)bath. Samples having vapor pressures in excess of124kPa(18psi) may develop sufficient pressures at100°C to rupture the pressure vessel.For any sample having a vapor pressure above 124kPa(18psi),use Test Method D1838.)1.2The values stated in SI units are to be regarded as the standard.The values in parentheses are for information only.1.3This standard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory requirements prior to use.For specific warning statements,see1.1,6.1,and Annex A2.2.Referenced Documents2.1ASTM Standards:2D396Specification for Fuel OilsD975Specification for Diesel Fuel OilsD1655Specification for Aviation Turbine FuelsD1838Test Method for Copper Strip Corrosion by Lique-fied Petroleum(LP)GasesD4057Practice for Manual Sampling of Petroleum and Petroleum ProductsD4177Practice for Automatic Sampling of Petroleum and Petroleum ProductsE1Specification for ASTM Liquid-in-Glass Thermometers 2.2ASTM Adjuncts:ASTM Copper Strip Corrosion Standard33.Summary of Test Method3.1A polished copper strip is immersed in a specific volume of the sample being tested and heated under conditions of temperature and time that are specific to the class of material being tested.At the end of the heating period,the copper strip is removed,washed and the color and tarnish level assessed against the ASTM Copper Strip Corrosion Standard.4.Significance and Use4.1Crude petroleum contains sulfur compounds,most of which are removed during refining.However,of the sulfur compounds remaining in the petroleum product,some can have a corroding action on various metals and this corrosivity is not1This test method is under the jurisdiction of ASTM Committee D02on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.05on Properties of Fuels,Petroleum Coke and Carbon Material.Current edition approved May1,2004.Published June2004.Originally approved in1922,replacing former st previous edition approved in2000as D130–94(2000)e1.In the IP,this test method is under the jurisdiction of the Standardization Committee.It is issued under thefixed designation IP154.Thefinal number indicates the year of last revision.This test method has been approved by the sponsoring committees and accepted by the cooperating societies in accordance with established procedures.2For referenced ASTM standards,visit the ASTM website,,or contact ASTM Customer Service at service@.For Annual Book of ASTM Standards volume information,refer to the standard’s Document Summary page on the ASTM website.3Available from ASTM International Headquarters.Order Adjunct No. s of suppliers in the United Kingdom can be obtained from Energy Institute,61New Cavendish St.,London,WIG7AR,U.K.Two master standards are held by the IP for reference.Copyright©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States.necessarily related directly to the total sulfur content.Theeffect can vary according to the chemical types of sulfur compounds present.The copper strip corrosion test is designed to assess the relative degree of corrosivity of a petroleum product.5.Apparatus5.1Copper Strip Corrosion Pressure Vessel,constructed from stainless steel according to the dimensions as given in Fig.1.The vessel shall be capable of withstanding a test pressure of700kPa gage(100psi).Alternative designs for the vessel’s cap and synthetic rubber gasket may be used provided that the internal dimensions of the vessel are the same as those shown in Fig.1.The internal dimensions of the pressure vessel are such that a nominal25-mm by150-mm test tube can be placed inside the pressure vessel.5.2Test Tubes,of borosilicate glass of nominal25-mm by 150-mm dimensions.The internal dimensions shall be checked as acceptable by use of a copper strip(see6.3).When30mL of liquid is added to the test tube with the copper strip in it,a minimum of5-mm of liquid shall be above the top surface of the strip.5.3Test Baths:5.3.1General—All test baths shall be able to maintain the test temperature to within61°C(2°F)of the required test temperature.5.3.2Liquid Bath Used for Submerging Pressure Vessel(s)—The bath shall be deep enough to submerge one or more pressure vessels(see5.1)completely during the test.As the bath medium,use water or any liquid that can be satisfac-torily controlled to the sample test temperature.The bath shall befitted with suitable supports to hold each pressure vessel ina vertical position when submerged.5.3.3Bath(s)Used for Test Tubes—Liquid baths shall be fitted with suitable supports to hold each test tube(see5.2)in a vertical position to a depth of about100-mm(4-in.)as measured from the bottom of the test tube to the bath surface. As a liquid bath medium,water and oil have been found satisfactory and controllable at the specified test temperature. Solid block baths shall meet the same temperature control and immersion conditions and shall be checked for temperature measurement(heat transfer)for each product class by running tests on tubesfilled with30mL of product plus a metal strip of the nominal dimensions given,plus a temperature sensor. 5.4Temperature Sensing Device(TSD),capable of monitor-ing the desired test temperature in the bath to within an accuracy of61°C or better.The ASTM12C(12F)(see Specification E1)or IP64C(64F)total immersion thermom-eters have been found suitable to use in the test.If used,no more than10-mm(0.4-in.)of the mercury should extend above the surface of the bath at the test temperature.5.5Polishing Vise,for holding the copper stripfirmly without marring the edges while polishing.Any convenient type of holder(see Appendix X1)may be used provided that the strip is held tightly and that the surface of the strip being polished is supported above the surface of the holder.5.6Viewing Test Tubes,flat glass test tubes,are convenient for protecting corroded copper strips for close inspection or storage(see Appendix X1for the description of aflat-glass Key:1Lifting eye2Wide groove for pressure relief3Knurled cap4Twelve threads per inch NF thread or equivalent5Camber inside cap to protect“O”ring when closing pressure vessel6Synthetic rubber“O”ring without free sulfur7Seamless tubeMaterial:stainless steelWelded constructionMaximum test gage pressure:700kPaN OTE1—Dimensions in millimetres.N OTE2—All dimensions without tolerance limits are nominal values.FIG.1Pressure Vessel for Copper Strip CorrosionTestviewing tube).The viewing test tube shall be of such dimen-sions as to allow the introduction of a copper strip(see6.3)and made of glass free of striae or similar defects.5.7Forceps,with either stainless steel or polytetrafluoroet-hylene(PTFE)tips,for use in handling the copper strips,have been found suitable to use.5.8Timing Device,electronic or manual,capable of accu-rately measuring the test duration within the allowable toler-ance.6.Reagents and Materials6.1Wash Solvent—Any volatile,less than5mg/kg sulfur hydrocarbon solvent may be used provided that it shows no tarnish at all when tested for3h at50°C(122°F).2,2,4-trimethylpentane(isooctane)of minimum99.75%purity is the referee solvent and should be used in case of dispute. (Warning—extremelyflammable,see A2.1.)6.2Surface Preparation/Polishing Materials,00grade or finer steel wool or silicon carbide grit paper or cloth of varying degrees offineness including65-µm(240-grit)grade;also a supply of105-µm(150-mesh)size silicon carbide grain or powder and absorbent cotton(cotton wool).A commercial grade is suitable,but pharmaceutical grade is most commonly available and is acceptable.6.3Copper Strips Specification—Use strips approximately 12.5-mm(1⁄2-in.)wide,1.5to3.0-mm(1⁄16to1⁄8-in.)thick,cut approximately75-mm(3-in.)long from smooth-surfaced, hard-temper,cold-finished copper of99.9+%purity;electrical bus bar stock is generally suitable(see Annex A1).The strips may be used repeatedly but should be discarded when the strip’s surface shows pitting or deep scratches that cannot be removed by the specified polishing procedure,or when the surface becomes deformed.6.4Ashless Filter Paper or Disposable Gloves,for use in protecting the copper strip from coming in contact with the individual duringfinal polishing.7.ASTM Copper Strip Corrosion Standards37.1These consist of reproductions in color of typical test strips representing increasing degrees of tarnish and corrosion, the reproductions being encased for protection in plastic and made up in the form of a plaque.7.1.1Keep the plastic-encased ASTM Copper Strip Corro-sion Standards protected from light to avoid the possibility of fading.Inspect for fading by comparing two different plaques, one of which has been carefully protected from light(for example,new plaque).Observe both sets in diffused daylight (or equivalent)first from a point directly above and then from an angle of45°.If any evidence of fading is observed, particularly at the left-hand end of the plaque,it is suggested that the one that is the more faded with respect to the other be discarded.7.1.1.1Alternatively,place a suitably sized opaque strip(for example,20-mm(3⁄4-in.)black electrical tape)across the top of the colored portion of the plaque when initially purchased.At intervals remove the opaque strip and observe.When there is any evidence of fading of the exposed portion,the standards shall be replaced.7.1.1.2These plaques are full-color reproductions of typical strips.They have been printed on aluminum sheets by a4-color process and are encased in plastic for protection.Directions for their use are given on the reverse side of each plaque.7.1.2If the surface of the plastic cover shows excessive scratching,it is suggested that the plaque be replaced.8.Samples8.1In accordance with D4057or D4177,or both,it is particularly important that all types of fuel samples,that pass a low-tarnish strip classification,be collected in clean,dark glass bottles,plastic bottles,or other suitable containers that will not affect the corrosive properties of the fuel.Avoid the use of tin plate containers for collection of samples,since experience has shown that they may contribute to the corrosiveness of the sample.8.2Fill the containers as completely as possible and close them immediately after taking the sample.Adequate headspace in the container is necessary to provide room for possible thermal expansion during transport.It is recommended that volatile samples befilled between70and80%of the contain-er’s capacity.Take care during sampling to protect the samples from exposure to direct sunlight or even diffused daylight. Carry out the test as soon as possible after receipt in the laboratory and immediately after opening the container.8.3If suspended water(that is,haze)is observed in the sample,dry byfiltering a sufficient volume of sample through a medium rapid qualitativefilter,into the prescribed clean,dry test tube.Carry out this operation in a darkened room or undera light-protected shield.8.3.1Contact of the copper strip with water before,during or after completion of the test run will cause staining,making it difficult to evaluate the strips.9.Preparation of Test Strips9.1Surface Preparation—Remove all surface blemishes from all six sides of the strip obtained from a previous analysis (see Note1).One way to accomplish this is to use00grade or finer steel wool or silicon carbide paper or cloth of such degrees offineness as are needed to accomplish the desired results efficiently.Finish with65-µm(240-grit)silicon carbide paper or cloth,removing all marks that may have been made by other grades of paper used previously.Ensure the prepared copper strip is protected from oxidation prior tofinal prepara-tion,such as by immersing the strip in wash solvent from which it can be withdrawn immediately forfinal preparation (polishing)or in which it can be stored for future use.N OTE1—Onlyfinal preparation(9.2)is necessary for commercially purchased pre-polished strips.9.1.1As a practical manual procedure for surface prepara-tion,place a sheet of silicon carbide paper or cloth on aflat surface and moisten it with kerosine or wash solvent.Rub the strip against the silicon carbide paper or cloth with a circular motion,protecting the strip from contact with thefingers by using ashlessfilter paper or wearing disposable gloves.Alter-natively,the surface of the strip can be prepared by use of motor-driven machines using appropriate grades of dry paper orcloth.9.2Final Preparation—For strips prepared in9.1or new strips being used for thefirst time,remove a strip from its protected location,such as by removing it from the wash solvent.To prevent possible surface contamination duringfinal preparation,do not allowfingers to come in direct contact with the copper strips,such as by wearing disposable gloves or holding the strips in thefingers protected with ashlessfilter paper.Polishfirst the ends and then the sides with the105-mm (150-mesh)silicon carbide grains picked up with a pad of cotton(cotton wool)moistened with wash solvent.Wipe vigorously with fresh pads of cotton(cotton wool)and subse-quently handle without touching the surface of the strip with thefingers.Forceps have been found suitable to use.Clamp in a vise and polish the main surfaces with silicon-carbide grains on absorbent cotton.Do not polish in a circular motion.Rub in the direction of the long axis of the strip,carrying the stroke beyond the end of the strip before reversing the direction. Clean all metal dust from the strip by rubbing vigorously with clean pads of absorbent cotton until a fresh pad remains unsoiled.When the strip is clean,immediately immerse it in the prepared sample.9.2.1It is important to polish the whole surface of the strip uniformly to obtain a uniformly stained strip.If the edges show wear(surface elliptical),they will likely show more corrosion than the center.The use of a vise(see Appendix X1)will facilitate uniform polishing.9.2.2It is important to follow the order of preparation with the correctly sized silicon carbide material as described in9.1 and9.2.Thefinal preparation is with105-µm silicon carbide powder.This is a larger grain size than the65-µm paper used in the surface preparation stage.The reason for this use of larger silicon carbide grains in thefinal preparation is to produce asperities(controlled roughness)on the surface of the copper,which act as sites for the initiation of corrosion reactions.10.Procedure10.1General—There are a variety of test conditions,which are broadly specific to given classes of product but,within certain classes,more than one set of test conditions of time or temperature,or both,may apply.In general,aviation gasoline shall be tested in a pressure vessel at100°C and other high vapor pressure fuels,like natural gasoline,at40°C.Other liquid products shall be tested in a test tube at50°C,100°C or even higher temperatures.The conditions of time and tempera-ture given below are commonly used and are quoted in the ASTM specifications for these products where such specifica-tions exist.They are,however,guides only.Other conditions can also be used when required by specifications or by agreement between parties.The test conditions of time and temperature shall be recorded as part of the result(see12.1).10.2Pressure Vessel Procedure—For use with aviation gasoline and higher vapor pressure samples.10.2.1For Aviation Gasoline and Aviation Turbine Fuel—Place30mL of sample,completely clear and free of any suspended or entrained water(see8.3)into a chemically clean and dry25-mm by150-mm test tube.Within1min after completing thefinal preparation(polishing),slide the copper strip into the sample tube.Place the sample tube into the pressure vessel(Fig.1)and screw the lid on tightly.If more than one sample is to be analyzed at essentially the same time, it is permissible to prepare each pressure vessel in the batch before completely immersing each pressure vessel in the liquid bath at10061°C(21262°F),provided the elapsed time between thefirst and last samples is kept to a minimum.After 2h65min in the bath,withdraw the pressure vessel and immerse for a few minutes in cool water(tap water).Open the pressure vessel,withdraw the test tube and examine the strip as described in10.4.10.2.2For Natural Gasoline—Carry out the test exactly as described in10.2.1but at40°C(104°F)and for3h65min.10.3Test Tube Procedure—For use with most liquid prod-ucts.10.3.1For Diesel Fuel,Fuel Oil,Automotive Gasoline—Place30mL of sample,completely clear and free of any suspended or entrained water(see8.3),into a chemically clean, dry25-mm by150-mm test tube and,within1min after completing thefinal preparation(polishing),slide the copper strip into the sample tube.If more than one sample is to be analyzed at essentially the same time,it is permissible to prepare each sample in the batch by stoppering each tube with a vented stopper,such as a vented cork before placing each tube in a bath maintained at5061°C(12262°F),provided the elapsed time between thefirst and last sample prepared is kept to a minimum.Protect the contents of the test tube from strong light during the test.After3h65min in the bath, examine the strip as described in10.4.For tests on fuel oil and diesel fuel,to specifications other than Specifications D396 and D975,a temperature of100°C(212°F)for3h is often used as an alternative set of conditions.Some automotive gasolines with vapor pressure above80kPa at37.8°C have exhibited evaporation losses in excess of10%of their volume. If such evaporation losses are apparent,it is recommended that the Pressure Vessel Procedure(see10.2)be used.10.3.2For Cleaners(Stoddard)Solvent and Kerosine—Carry out the test exactly as described in10.3.1but at1006 1°C(21262°F).10.3.3For Lubricating Oil—Carry out the test exactly as described in10.3.1,but the tests can be carried out for varying times and at elevated temperatures other than100°C(212°F). For the sake of uniformity,it is suggested that even increments of5°C,beginning with150°C,be used.10.4Strip Examination:10.4.1Empty the contents of the test tube into a suitably sized receiver.If a receiver made out of glass is used,such as a150-mL tall-form beaker,let the strip slide in gently so as to avoid breaking the glass.Immediately withdraw the strip with forceps and immerse in wash solvent.Withdraw the strip at once,dry and inspect for evidence of tarnishing or corrosion by comparison with the Copper Strip Corrosion Standards.The step of drying the strip may be done by blotting withfilter paper,air drying,or by other suitable means.Hold both the test strip and the standard strip plaque in such a manner that light reflected from them at an angle of approximately45°will be observed.10.4.2In handling the test strip during the inspection and comparison,the danger of marking or staining can beavoidedif it is inserted in a flat glass tube (see Appendix X1),which can be stoppered with absorbent cotton.11.Interpretation of Results11.1Interpret the corrosiveness of the sample in accordance with one of the classifications of the ASTM Copper Strip Corrosion Standard as listed in Table 1.11.1.1When a strip is in the obvious transition state between that indicated by any two adjacent standard strips,rate the sample at the more tarnished classification.Should a strip appear to have a darker orange color than Standard Strip 1b,consider the observed strip as still belonging in Classification 1;however,if any evidence of red color is observed,the observed strip belongs in Classification 2.11.1.2A 2a strip can be mistaken for a 3a strip if the brassy underlay of the 3a strip is completely masked by a magenta overtone.To distinguish,immerse the strip in wash solvent;a 2a strip will appear as a 1b strip,while a 3a strip will not change.11.1.3To distinguish a 2c strip from a 3b strip,place a test strip in a 25-mm by 150-mm test tube and bring to a temperature of 340630°C in 4to 6min with the tube lying on a hot plate.Adjust to temperature by observing a high distillation thermometer inserted into a second test tube.Thus,a 2c strip will assume the color of a 2d strip and successive stages of tarnish;a 3b strip will take on the appearance of a 4a strip.11.1.4Repeat the test if blemishes due to fingerprints are observed,or due to spots from any particles or water droplets that may have touched the test strip during the digestion period.11.1.5Repeat the test also if the sharp edges along the flat faces of the strip appear to be in a classification higher than the greater portion of the strip;in this case,it is likely that the edges were burnished during preparation (polishing).12.Report12.1Report the corrosiveness in accordance with one of the classifications listed in Table 1.State the duration of the test and the test temperature in the following format:Corrosion copper strip ~X h /Y °C !,Classification Zpwhere:X =test duration,in hours,Y =test temperature,°C,Z =classification category (that is,1,2,3,or 4),and p =classification description for the corresponding Z (forexample,a,b).13.Precision and Bias13.1In the case of pass/fail data,no generally accepted method for determining precision or bias is currently available.14.Keywords14.1automotive gasoline;aviation gasoline;aviation tur-bine fuel;copper corrosion;copper strip;corrosiveness to copper;natural gasolineTABLE 1Copper Strip ClassificationsClassification Designation Description AFreshly polished strip...B1slight tarnisha.Light orange,almost the same as freshly polished stripb.Dark orange 2moderate tarnish a.Claret red ... vender... c.Multicolored with lavender blue or silver,or both,overlaid on claret red ... d.Silvery...e.Brassy or gold3dark tarnish a.Magenta overcast on brassy strip... b.Multicolored with red and green showing (peacock),but no gray4corrosion a.Transparent black,dark gray or brown with peacock green barely showing ... b.Graphite or lusterless black ...c.Glossy or jet blackAThe ASTM Copper Strip Corrosion Standard is a colored reproduction of strips characteristic of these descriptions.BThe freshly polished strip is included in the series only as an indication of the appearance of a properly polished strip before a test run;it is not possible to duplicate this appearance after a test even with a completely noncorrosivesample.ANNEXES(Mandatory Information)A1.COPPER QUALITYA1.1Copper QualityA1.1.1Hard-temper,cold-finished type-(ETP)electrolytic tough pitch copper.4A2.WARNING STATEMENTSA2.1IsooctaneHarmful if inhaled.Vapors may cause flash fire.Keep away from heat,sparks,and open flame.Keep container closed.Use with adequate ventilation.Avoid build-up of vapors and eliminate all sources of ignition,especially nonexplosion-proof electrical apparatus and heaters.Avoid prolonged breathing of vapor or spray mist.Avoid prolonged or repeated skin contact.A2.2Aviation Turbine Fuel (Jet A or A-1,seeSpecification D 1655)Keep away from heat,sparks,and open flames.Keep container closed.Use with adequate ventilation.Avoid breathing vapor or spray mist.Avoid prolonged or repeated contact with skin.A2.3Gasoline (Containing Lead)Keep away from heat,sparks,and open flame.Keep container closed.Use with adequate ventilation.Avoid build-up of vapors and eliminate all sources of ignition,especially nonexplosion-proof electrical apparatus and heaters.Avoid prolonged breathing of vapor or spray mist.Avoid prolonged or repeated skin contact.A2.4Gasoline (White or Unleaded)Keep away from heat,sparks,and open flame.Keep container closed.Use with adequate ventilation.Avoid build-up of vapors and eliminate all sources of ignition,especially nonexplosion-proof electrical apparatus and heaters.Avoid prolonged breathing of vapor or spray mist.Avoid prolonged or repeated skin contact.A2.5KerosineKeep away from heat,sparks,and open flame.Keep container closed.Use with adequate ventilation.Avoid breathing vapor or spray mist.Avoid prolonged or repeated contact with skin.A2.6Stoddard SolventKeep away from heat,sparks,and open flame.Keep container closed.Use with adequate ventilation.Avoid prolonged breathing of vapor or spray mist.Avoid prolonged or repeated skin contact.4Conforming to Copper Development Association (CDA),United States of America No.110,or to British Standard (BS)EN 1652or BS 4608,which have properquality.APPENDIX(Nonmandatory Information)X1.OPTIONAL USEFUL EQUIPMENTX1.1Viewing TubeX1.1.1A usefulflat glass test tube for holding tarnishedcopper strips for inspection or for storage for later inspection isillustrated and dimensioned in Fig.X1.1.X1.2Strip ViseX1.2.1A useful and convenient vise for holding up to fourcopper strips duringfinal polishing is illustrated and dimen-sioned in Fig.X1.2.N OTE1—Dimensions in millimetres.N OTE2—The dimensions are the minimum dimensions that shall allowthe introduction of a copper strip.N OTE3—The tube shall be free of striae or similar defects.FIG.X1.1Flat Glass Viewing Test TubeKey:1Material:Plastic2Material:Brass3Wing nut4Ø5-mm metric thread or equivalentN OTE—Dimensions in millimetres.FIG.X1.2Multistrip ViseASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this ers of this standard are expressly advised that determination of the validity of any such patent rights,and the risk of infringement of such rights,are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed everyfive years and if not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of the responsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards,at the address shown below.This standard is copyrighted by ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959, United States.Individual reprints(single or multiple copies)of this standard may be obtained by contacting ASTM at the above address or at610-832-9585(phone),610-832-9555(fax),or service@(e-mail);or through the ASTM website ().。
液化石油气检测报告详解目前,对液化石油气的检测采用国家强制标准GH11174《液化石油气》,所检测项目包括密度、蒸气压、组分、残留物、铜片腐蚀、总硫含量和游离水等七项。
1. 标准中没有对密度规定具体的质量指标,只是在检测报告中列出试验结果,不能进行合格与否的判定。
其具体试验方法按标准SH/T0221《液化石油气密度或相对密度测定法》:有15C或20C两种,在结果中应注明具体的密度单位和试验温度。
本标准与国际标准IS03993《液化石油气和轻质烃密度或相对密度测定法(压力密度计法)》基本相同,在IS03993中,规定试验温度还可以为60华氏度。
2. 蒸气压是指液体的蒸气与液体处于平衡状态时所产生的压力。
它作为一项安全指标,保证产品的安全处置,对运输容器、贮存容器及用户使用设备有重要意义。
其质量指标要求不大于138OkPa ,试验方法按标准GB6602《液化石油气蒸气压侧定法》。
3. 组分的测定在液化气的测定中是一个重要的项目,通过它可以校验其它项目,同时也是炼油厂的重要参考指标。
按照标准SH1T0230《液化石油气组分测定法》或GB 10410.3 《液化石油气组分气相色谱分析法》检测,两者具体方法相同,不再重复,在此主要谈谈对标准中的几点不同看法。
1)SH/T0230和GB 10410.3均采用气化试样进样方法,见图1.S 1毛化试稈系统⅛⅛ffi卜试样钢瓶卜容器阀3「流量调节国4水浴装S ”六通阀A裁止阀该系统存在一定的缺陷,通常通过流量调节阀来控制管路中的流量,由于液化气的压力较大,要达到标准中规定的流量(5〜IOOmL∕min),只有将流量调节阀打开少许,在此存在气化现象,又由于液化气中各组分气化能力的不同,C2、C3轻组分有一部分先气化,相对难气化的C4 C5进入后面管路的比例会减少,所以测得的组分与液相成分会有一定差异。
之间加热气化。
这样保证了通过六通阀的是与原液相成分相同的液体,将气化装置置于六通阀和色谱柱之间。
安全管理/行业安全液化石油气铜片腐蚀试验法一、概述铜片腐蚀:在规定条件下,测试液化石油气对铜的腐蚀趋向的试验。
液化石油气的铜片腐蚀试验,主要是测定液化石油气的腐蚀性程度。
因为液化石油气在储运及使用过程中,均采用金属容器罐装,如果液化石油气腐蚀性过强,就会造成储运设备,容器的严重腐蚀,致使缩短使用期限,甚至引发其他危险。
因此,这项试验有重要意义。
我国现行的液化石油气铜片腐蚀试验法是采用SH/T 0232《液化石油气铜片腐蚀试验法》,该方法等效采用ISO 6521-1982《液化石油气铜片试验法》。
二、原理将磨光的铜片,全部浸入装有100mL已被水饱和的试样的容器中,该容器应具有一定的工作压力(≥7.0MPa),在40℃温度下放置1h,取出后与标准色板比较,判断其腐蚀级别。
三、仪器设备(1)铜片腐蚀试验弹:由不锈钢制成,容量约160mL。
整套组件应能经受约7.0MPa的静压试验,当用气体约在3.5MPa压力下试验时应无泄漏,见图1-6-4。
(2)恒温水浴:能够维持40℃±0.5℃的水温并配有使试验弹保持垂直的悬架或支架,有足够的空间可以将整个圆筒(包括阀)浸没。
(3)水银温度计:全浸0~50℃分度0.1℃。
(4)铜片磨光夹具:磨铜片用,能够夹紧铜片且不损伤铜片边缘,方便铜片磨光操作即可。
四、材料(1)洗涤溶剂:标准异辛烷,或其他无硫烃类溶剂,例如石油醚(90~120℃)。
图1-6-4 铜片腐蚀试验弹1-6mm的针型阀A;2-氯丁橡胶O形密封圈;3-铜片;4-6mm的针型阀B(2)铜片:电解铜,纯度99.9%以上,长7.5cm,宽1.25cm,厚0.15~0.30cm,表面光滑经冷轧淬硬,且在一端中心3.0mm 处钻一直径为3.0mm的小孔。
(3)磨光材料:65μm碳化硅或刚玉砂纸、砂布,抛光用150目的碳化硅或刚玉砂,以及药用脱酯棉。
五、标准色板(1)腐蚀标准色板为全色复制品。
它是在铝板上通过四道色加工处理印成的。
液化石油气 GB 11174-891.主题内容与适用范围本标准规定了由石油炼厂生产的液化石油气的技术条件。
本标准所属的产品适用于作工业和民用燃料。
2.引用标准GB5842 液化石油气钢瓶GB6602 工业用裂解碳四蒸气压的测定雷德法ZB E46001 液化石油气密度或相对密度测定法(压力密度计法)ZB B46002 液化石油气总硫测定法(电量法)SY2081 液化石油气组成测定法(色谱法)SY2083 液化石油气铜片腐蚀试验法SY2084 液化石油气采样法SY7509 液化石油气残图物测定法CJ2-81 液化石油气钢瓶角阀3.技术要求┏━━━━━━━━━━━━━━━━━━┯━━━━━━━┯━━━━━━━┓┃项目│质量指标│实验方法┃┠──────────────────┼───────┼───────┨┃密度(15℃),KG/M3 │报告│ ZBE 46001 ┃┠──────────────────┼───────┼───────┨┃蒸气压(37.8℃),KPA 不大于│ 1380 │ GB 6602 ┃┠──────────────────┼───────┼───────┨┃C5及C5以上组分含量,%(V/V)不大于│ 3.0 │ SY 7509 ┃┠──────────────────┼───────┼───────┨┃残留物││ SY7509 ┃┠──────────────────┼───────┼───────┨┃蒸发残留物,ML/100ML │报告│┃┠──────────────────┼───────┼───────┨┃油渍观察值,ML │报告│┃┠──────────────────┼───────┼───────┨┃铜片腐蚀,级不大于│ 1 │ SY 2083 ┃┠──────────────────┼───────┼───────┨┃总硫含量,MG/M3 不大于│ 343 │ ZB E 46002 ┃┠──────────────────┼───────┼───────┨┃游离水│无│目测1)┃┗━━━━━━━━━━━━━━━━━━┷━━━━━━━┷━━━━━━━┛注:①为确保液化石油气的使用安全,液化石油气要求有特殊气味,必要时加入硫醇、硫醚等含硫化物配制的加臭剂。
石油产品铜片腐蚀的试验方法为什么要测量石油产品中的铜片腐蚀呢?由于原油是含酸的,所以绝大多数从原油生产出来的产品都有肯定的酸性(腐蚀性),铜片腐蚀就是测量石油产品的腐蚀性;不同指标的用于不同级别的终端,例如:液化气中的腐蚀性,对钢材设备有微量的腐蚀性,对橡胶有溶化作用,灌装液化气终端都有塑料管,腐蚀性大,确定会产生不安全。
铜片腐蚀测定仪的试验方法:铜片腐蚀设备用于测定柴油、汽油、润滑油或其他石油产品对铜的腐蚀性程度,本方法涉及到易燃材料,操作前要注意试样的燃点、闪点,操作时要注意安全.石油产品铜片腐蚀的试验过程:1、取样:取30毫升的试样倒入试验试管中,试样尽量保存在干净、深色的玻璃瓶内,试管要干燥、清洁。
2、不同的试样采纳不同的试验步骤:A、润滑油、溶剂油、煤油:量取30毫升*清亮、无悬浮水或内含水的试样倒入清洁、干燥并带有试管夹的试管中,将zui后磨光、干净的铜片放入该试管的试样中,把带有试管夹的试管放到已维持在1001℃的浴中,在浴中放置35小时后取出试管,检查铜片。
B、航空汽油、喷气燃料:量取30毫升*清亮、无悬浮水或内含水的试样倒入清洁、干燥的试管中,把该试管当心的滑入试验弹中,把弹盖旋紧,把试验弹*放入已维持在1001℃的浴中,在浴中放置25小时后取出试验弹,用自来水冲几分钟,打开试验弹,取出试管,检查铜片。
C、天然汽油:量取30毫升*清亮、无悬浮水或内含水的试样倒入清洁、干燥的试管中,把该试管当心的滑入试验弹中,把弹盖旋紧,把试验弹*放入已维持在401℃的浴中,在浴中放置25小时后取出试验弹,用自来水冲几分钟,打开试验弹,取出试管,检查铜片D、柴油、燃料油、车用汽油:量取30毫升*清亮、无悬浮水或内含水的试样倒入清洁、干燥并带有试管夹的试管中,将zui后磨光、干净的铜片放入该试管的试样中,把带有试管夹的试管放到已维持在501℃的浴中,在浴中放置35小时后取出试管,检查铜片。
液化石油气铜片腐蚀不合格问题的原因及应对
付宝强
【期刊名称】《石油石化物资采购》
【年(卷),期】2024()11
【摘要】首先分析液化石油气铜片腐蚀不合格问题的主要原因。
其中,不适宜的材料选择、错误的加工方式和制造工艺以及环境因素的影响是导致铜片腐蚀不合格的核心因素。
其次,针对这些原因提出相应的应对措施。
优化材料选择、改进加工和制造工艺、加强环境管理和监测将有助于解决铜片腐蚀问题,提高产品质量和设备的可靠性。
通过理论分析,可以加深对液化石油气铜片腐蚀问题的认识,为相关行业提供参考,促进液化石油气储存和运输的安全可靠性。
【总页数】3页(P34-36)
【作者】付宝强
【作者单位】佛山市南海中胜石油气有限公司
【正文语种】中文
【中图分类】F42
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可编辑修改精选全文完整版液化气试题一、选择题(50分,每题1分)1装压力气体取样器应该以最大操作压力的()倍进行试压。
(A)2 (B)1.5 (C)1.25 (D)2.52. 液化石油气的采样法标准的代号是()-1992。
(A)SH/T 0221 (B)SH/T 0230 (C)SH/T 0253 (D)SH/T 02333.采液化石油气样时,必须先以液化气冲洗采样器,然后将液相试样装至()。
(A)充满整个容器,以防其组成改变(B)采样器容积的90%(C)采样器容积的80% (D)采样器容积的70% 4.液化石油气的主要成分是()。
(A)乙烷、乙烯和丙烷、丙烯(B)丙烷、丙烯和丁烷、丁烯(C)丁烷、丁烯和戊烷、戊烯(D)丙烷、丙烯和戊烷、戊烯5.采液化石油气试样时应戴()和防护镜。
(A)工作帽(B)手套(C)防毒面具(D)罐区工作证6.凡能产生有毒有害气体的操作都应在()中进行。
(A)全通风化验室(B)局部排气罩(C)通风橱(D)通风良好的化验室7.易燃液体储藏室的室温一般不允许超过28℃,爆炸品储藏室不许超过()。
(A)20℃(B)25℃(C)28℃(D)30℃8. 液化石油气铜片腐蚀试验法的标准代号是()-1992 。
(A)SH/T 0221 (B)SH/T 0230 (C)SH/T 0253 (D)SH/T 02339.测定液化石油气铜片腐蚀时所使用的铜片纯度大于( )的电解铜.(A)89.9% (B)99.9% (C)98.9% (D)89.0%10.测定液化石油气铜片腐蚀时所使用的温度计为全浸,最小分度为( ) .(A)小于1℃ (B)大于1℃ (C)1℃或小于1℃ (D)0.1℃11.测定液化石油气铜片腐蚀时,在有争议的情况下所使用的洗涤溶剂为( ) .(A)分析纯异辛烷 (B)分析纯石油醚或标准石油醚(C)分析纯石油醚 (D)分析纯异辛烷或标准异辛烷12. 液化石油气铜片腐蚀试验可用符合 GB466《铜分类》中( ) .(A)Cu1(1 号铜) (B)Cu2(2 号铜) (C)Cu3(3 号铜) (D)Cu4(4 号铜)13. 液化石油气铜片腐蚀试验法中,标准色板分( )级.(A)1 (B)2 (C)3 (D)414. 液化石油气铜片腐蚀试验法中,标准色板应( )存放.(A)通风柜内 (B)在阳光下 (C)试验台上 (D)避光15. 液化气的铜片腐蚀试验是一种( )的衡量液化气的防腐蚀性能的一种方法.(A)定性 (B)定量 (C)既定性又定量 (D)既不定性又不定量16.铜片腐蚀试验时,温度和时间是影响的主要因素,一般温度越( ) ,时间越( ) ,铜片越 ( )腐蚀.(A)高,短,容易 (B)高,长,容易 (C)低,短,容易 (D) 低,长,容易17.铜片腐蚀试验在进行试片准备时要使用碳化硅或氧化铝的磨光材料,在有争议时,用( ) 材质的磨光材料.(A)碳化硅 (B)氧化铝 (C)二者均可 (D)二者均不可18.铜片腐蚀试验在进行试片准备时,表面准备步骤不包括( ) .(A)先把六个面上的瑕疵去掉 (B)用150目的碳化硅或氧化铝砂纸处理(C)用 240目的碳化硅或氧化铝砂纸处理 (D)用定量滤纸擦去铜片上的金属屑19.铜片腐蚀试验在进行试片准备时,最后磨光步骤包括( ) .(A)先把六个面上的瑕疵去掉 (B)用150目的碳化硅或氧化铝砂粒处理(C)用 240目的碳化硅或氧化铝砂纸处理 (D)用定量滤纸擦去铜片上的金属屑20.铜片腐蚀试验在进行试片准备时,使用的工具及材料不包括( ) .(A) 150目的碳化硅或氧化铝砂粒 (B)脱脂棉(C) 240目的碳化硅或氧化铝砂纸 (D)腐蚀标准色板21.测定铜片腐蚀,比较铜片要求铜片和腐蚀标准色板对光线成( )角折射.(A)30° (B)45° (C)60° (D)90°22.液化石油气铜片腐蚀试验法规定,铜片浸入恒温浴时间为( ) 小时±5 分钟.(A)1 (B)2 (C)3 (D)423.当铜片是介于两种相邻的标准色板之间的腐蚀级时,则按其变色( )腐蚀级判断试样.(A)轻微的 (B)严重的 (C)可轻微可严重 ( D)没有要求24.当铜片出现有比标准色板中 1b 还深的橙色时,则认为铜片( ) ,如果观察到有红颜色时, 则所观察的铜片判断为( ) .(A)属于 2 级,1 级 (B)属于 2 级,2 级(C)仍属 1 级,1 级 (D)仍属 1 级,2 级25.按腐蚀级报告试样的腐蚀性,并报告( ) .(A)试验时间 (B)试验温度 (C)试验时间和试验温度 (D)没有要求26.液化石油气组成的测定法(色谱法)标准的代号是()-1992。
ASTM D 130-12译文石油产品铜片腐蚀标准试验方法1 范围1.1本方法适用于测定航空汽油、喷气燃料、车用汽油、清洗溶剂油、煤油、柴油、馏分燃料油、润滑油、天然汽油或其他具有37.8℃雷德蒸气压不大于124干帕斯卡(18磅/平方英尺)的其他石油烃类产品对铜的腐蚀。
警告:某些石油产品,特别是天然汽油,其蒸气压比车用汽油或航空汽油的蒸气压更高。
因此,必须特别注意,一定不要把装有高蒸气压的天然汽油或其他产品的试验弹放在100℃浴中。
雷德蒸气压超过124干帕斯卡(18磅/平方英寸)的试样要采用D 1838试验法来测定1.2 本标准采用国际单位制SI单位。
括号内的数据仅为提供信息之用。
1.3本标准涉及某些有危险性的材料、操作和设备,但是无意对与此有关的所有安全问题都提出建议。
因此,用户在使用本标准之前应建立适当的安全和防护措施并确定有适用性的管理制度。
特别注意事项见1.1、6.1和附录A2。
2 参考文件2.1 ASTM标准ASTM D 396燃料油规格ASTM D 975柴油规格ASTM D 1655 航空喷气燃料规格ASTM D 1838 液化石油气铜片腐蚀测定法ASTM D 4057石油和石油产品的手工取样用标准实施规程ASTM D 4177石油和石油产品自动抽样的标准实施规程ASTM D 6300石油产品和润滑剂试验方法中使用的精确度和偏差数据测定的标准实施规程ASTM E 1 ASTM玻璃液体热力计规格2.2 ASTM标准附件ASTM铜片腐蚀标准色板3 术语3.1首字母缩略词3.1.1 CAMI:表明覆盖磨料制造者协会3.1.2 FEPA:欧共体生产者协会4方法概要4.1把一块已抛光好的铜片浸没在一定里的试样中,并按产品标准要求加热到指定的温度,保持一定的时间。
待试验周期结束时,取出铜片,经洗涤后与腐蚀标准色板进行比较,确定腐蚀级别。
5 意义和用途5.1原油中的大部分硫化物在精制的过程中被除去,但是,残留在油品中的某些硫化物会对各种金属产生腐蚀。
铜片腐蚀试验操作规程
试验前的准备:
1、试片的制备:
先用砂纸把铜片六个面上的瑕疵去掉。
再用65微米的砂纸处理,以除去在此以前用其他等级砂纸留下的打磨痕迹。
打磨时,把一张砂纸放在平坦的表面上,用煤油或洗涤溶剂湿润砂纸,以旋转的动作将铜片对着砂纸摩擦,用无灰滤纸或夹钳夹持。
以防止铜片与手指接触。
打磨完用定量滤纸擦去铜片上的金属屑,把铜片浸没在洗涤溶剂中备用。
2、取样:
容器要尽可能装满试样,取样后立即盖上,取样时要小心,防止试样暴露于直接的阳光下,甚至散射的日光下。
实验室收到试样后,在打开容器后尽快进行实验。
试验步骤:
1、把完全清澈和无任何悬浮水或无内含水的试样倒入清洁、干燥的试管
中30毫升刻线处,并将经过最后磨光的干净的铜片在1分钟内浸入该试管的试样中。
用一个有排气孔的软木塞塞住试管。
把该试管放到50±1℃的水浴中。
在浴中放置3小时±5分钟后,按下步检查铜片。
2、试管的内容物倒入150毫升高型烧杯中,倒时要让铜片轻轻地滑入,
以免碰破烧杯。
用不锈钢镊子立即将铜片取出,浸入洗涤溶剂中,洗去试样。
立即取出铜片,用定量滤纸吸干铜片上的洗涤溶剂。
把铜片放入扁平试管中,用棉花塞住管口,把铜片与腐蚀标准色板比较来检
查变色或腐蚀迹象。
比较时,铜片和腐蚀标准色板对光线成45度角的折射方式拿持,进行观察。
腐蚀铜片变色说明
当铜片是介于两种相邻的标准色板之间的腐蚀级别时,则按变色严重的腐蚀级别来判断试样。
注意:铜片六个面一定要打磨干净,不留一点腐蚀迹象,否则影响实验结果,导致做样失败。
液化石油气铜片腐蚀试验法
一、概述
铜片腐蚀:在规定条件下,测试液化石油气对铜的腐蚀趋向的试验。
液化石油气的铜片腐蚀试验,主要是测定液化石油气的腐蚀性程度。
因为液化石油气在储运及使用过程中,均采用金属容器罐装,如果液化石油气腐蚀性过强,就会造成储运设备,容器的严重腐蚀,致使缩短使用期限,甚至引发其他危险。
因此,这项试验有重要意义。
我国现行的液化石油气铜片腐蚀试验法是采用SH/T 0232《液化石油气铜片腐蚀试验法》,该方法等效采用ISO 6521-1982《液化石油气铜片试验法》。
二、原理
将磨光的铜片,全部浸入装有100mL已被水饱和的试样的容器中,该容器应具有一定的工作压力(≥7.0MPa),在40℃温度下放置1h,取出后与标准色板比较,判断其腐蚀级别。
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