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【英文标准名称】:StandardTestMethodforRepassivationPotentialofAluminumandItsAlloysbyGalvanostaticMeasurement
【原文标准名称】:用恒电流测量铝及其合金的再钝化电位的标准试验方法
【标准号】:ASTMD6208-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:D15.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:铝;铝合金;腐蚀;钝化;斑蚀;测试
【英文主题词】:aluminum;corrosion;electrochemicalmeasurement;galvanostatic;localizedcorrosion;polarization
【摘要】:Thistestmethodisdesignedtomeasuretherelativeeffectivenessofinhibitorstomitigatepittingcorrosionofaluminumanditsalloys,inparticularAA3003-H14,rapidlyandreproducibly.Themeasurementsarenotintendedtocorrelatequantitativelywithothertestmethodvaluesorwithsusceptibilitytolocalizedcorrosionofaluminumobservedinservice.Qualitativecorrelationofthemeasurementsandsusceptibilityinservicehasbeenestablished(1).Themaximumpotentialreacheduponinitialpolarization,EB,isameasureoftheresistancetobreakdownofthealuminumoxidefilm.Lowersusceptibilitytoinitiationofpittingcorrosionisindicatedbyamorenoblepotential(SeePracticeG3andTerminologyG15.)Thispotential,asmeasuredinthistestmethod,isnotverysensitivetotheinhibitorspresent.Theminimumpotential,EG,followingthemaximumpotentialisameasureoftheprotectionagainstcontinuedpittingcorrosionbytheinhibitors.Again,amorenoblepotentialindicatesbetterprotection.Thispotentialissensitivetotheinhibitorspresent.Visualexaminationofthespecimenscanprovideinformationaboutsubletiesofthepittingandinhibitionmechanisms.Numberofpits,pitdepth,amountofdeposit,andsurfacediscolorationaresomeexamplesofrecordableobservations,whichcanassistevaluationofinhibitoreffectiveness.Thepresenceofchlorideinthetestsolutioniscriticaltoobservationofpittingcorrosion.Also,acoolant/corrosivewatersolutioninwhichgasbubblesevolvespontaneouslyonthealuminum(indicatinggeneralcorrosion)isunlikelytohaveasignificantamountofobservablepittingcorrosion.1.1Aproceduretodeterminetherepassivationpotentialofaluminumalloy3003-H14(UNSA93003)(1)asameasureofrelativesusceptibilitytopittingcorrosionbyconductingagalvanostaticpolarizationisdescribed.Aprocedurethatcanbeusedtocheckexperimentaltechniqueandinstrumentationisdescribed,aswell.1.2Thetestmethodservesasaguideforsimilarmeasurementonotheraluminumalloysandmetals(2-5).1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Valuesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H61
【国际标准分类号】:77_150_10
【页数】:6P.;A4
【正文语种】: