ASTM B764-2004 多层镍镀层中单层的同步厚度和电极电势测定的标准试验方法(STEP试验)

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【英文标准名称】:StandardTestMethodforSimultaneousThicknessandElectrodePotentialDeterminationofIndividualLayersinMultilayerNickelDeposit(STEPTest)
【原文标准名称】:多层镍镀层中单层的同步厚度和电极电势测定的标准试验方法(STEP试验)
【标准号】:ASTMB764-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【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】:B08.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:覆层技术;镍;覆层;试验;电化学镀覆;表面处理;厚度;覆层厚度;金属的;金属;金属覆层
【英文主题词】:potential;STEP;thickness
【摘要】:Theabilityofamultilayernickeldeposittoenhancecorrosionresistanceisafunctionofthedifferenceintheelectrodepotentialsofthenickellayers(asmeasuredindividuallyatafixedcurrentdensityinagivenelectrolyteversusareferenceelectrode)andthethicknessesofthelayers.Thepotentialdifferencesmustbesufficienttocausethebrightnickelortoplayertocorrodepreferentiallyandsacrificiallywithrespecttothesemi-brightnickellayerbeneathit.Thistestprocedureallowsthemeasurementofthesepotentialdifferencesdirectlyonanelectroplatedpartratherthanonseparatefoilspecimensinsuchawaythattimedeterminesthethicknessofeachlayer,whilethepotentialdifferencebetweennickellayersisanindicationofthecorrosionresistanceofthetotalnickeldeposit.Theinterpretationandevaluationoftheresultsofthistestshouldbebyagreementbetweenthepurchaserandthemanufacturer.Note18212;Thistestmaybeusedasaqualityassurancetestofthemultilayernickelcoatingsappliedinproduction.Itshouldbeunderstoodthatduetomanyfactorsthatinfluencetheprogressofcorrosionduringactualuseofthepart,theperformanceofdifferentmultilayernickeldepositsinthetestcannotbetakenasanabsoluteindicatoroftherelativecorrosionresistanceofthesedepositsinservice.1.1Thistestmethodcloselyestimatesthethicknessofindividuallayersofamultilayernickelelectrodepositandthepotentialdifferencesbetweentheindividuallayerswhilebeinganodicallystrippedatconstantcurrentdensity.1.2Thistestmethoddoesnotcoverdepositsystemsotherthanmultilayerelectroplatednickeldeposits.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A29
【国际标准分类号】:25_220_40
【页数】:6P.;A4
【正文语种】: