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【英文标准名称】:Specificationforingotsandcastingsofmagnesium-zinc-cerium-zirconiumalloy(precipitationtreated)(Zn4.5,rareearthmetals1.2,Zr0.7)
【原文标准名称】:镁-锌-铈-锆合金(沉淀处理)铸锭和铸件规范(Zn4.5、稀土金属1.2、Zr0.7)
【标准号】:BS2L128-1970
【标准状态】:现行
【国别】:英国
【发布日期】:1970-03-26
【实施或试行日期】:1970-03-26
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:航空运输工程;铸件;含铈合金;化学成分;热处理;铸锭;镁合金;材料的机械性能;沉淀硬化;含锌合金;含锆合金
【英文主题词】:Airtransportengineering;Castings;Cerium-containingalloys;Chemicalcomposition;Heattreatment;Ingots;Magnesiumalloys;Mechanicalpropertiesofmaterials;Precipitationhardening;Zinc-containingalloys;Zirconium-containingalloys
【摘要】:BRITISHSTANDARD:AEROSPACESERIESSPECIFICATIONFORINGOTSANDCASTINGSOFMAGNESIUM-ZINC-CERIUM-ZIRCONIUMALLOY(Precipitationtreated)1.INSPECTIONANDTESTINGPROCEDURE2.CHEMICALCOMPOSITION3.HEATTREATMENT4.MECHANICALPROPERTIES5.PROTECTIONAGAINSTCORROSION
【中国标准分类号】:V11
【国际标准分类号】:49_025_99
【页数】:2P;A4
【正文语种】:英语


【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】: