【英文标准名称】:StandardTestMethodforMeasurementofCorrosionPotentialsofAluminumAlloys
【原文标准名称】:测定铝合金潜在腐蚀性
【标准号】:ASTMG69-1997(2003)
【标准状态】:现行
【国别】:
【发布日期】:1997
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:G01.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:铝;合金;工艺;磨损;测量;腐蚀;金属
【英文主题词】:aluminumalloy;aqueous;copper;corrosionpotential;sodiumchloride;solidsolution;zinc
【摘要】:Thecorrosionpotentialofanaluminumalloydependsupontheamountsofcertainalloyingelementsthatthealloycontainsinsolidsolution.Copperandzinc,whicharetwoofthemajoralloyingelementsforaluminum,havethegreatesteffectwithcoppershiftingthepotentialinthenobleorpositivedirection,andzincintheactiveornegativedirection.Forexample,commerciallyunalloyedaluminum(1100alloy)3hasapotentialofx2212;750mVwhenmeasuredinaccordancewiththispractice,2024x2013;T3alloywithnearlyallofitsnominal4.3%copperinsolidsolution,apotentialofx2212;600tox2212;620mV(Note2),and7072alloywithnearlyallofitsnominal1.0%zincinsolidsolution,apotentialofx2212;885mV(SCE)(1-3).4Note28212;Thepotentialdependsupontherateofquenching.Becauseitreflectstheamountofcertainalloyingelementsinsolidsolution,thecorrosionpotentialisausefultoolforcharacterizingthemetallurgicalconditionofaluminumalloys,especiallythoseofthe2XXXand7XXXtypes,whichcontaincopperandzincasmajoralloyingelements.Itsusesincludethedeterminationoftheeffectivenessofsolutionheattreatmentandannealing(1),oftheextentofprecipitationduringartificialaging(4)andwelding(5),andoftheextentofdiffusionofalloyingelementsfromthecoreintothecladdingofalcladproducts(2).1.1Thistestmethodisaprocedureformeasurementofthecorrosionpotential(seeNote1)ofanaluminumalloyinanaqueoussolutionofsodiumchloridewithenoughhydrogenperoxideaddedtoprovideanamplesupplyofcathodicreactant.Note18212;Thecorrosionpotentialissometimesreferredtoastheopen-circuitsolutionorrestpotential.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H25
【国际标准分类号】:77_120_10
【页数】:4P.;A4
【正文语种】: