ASTM B766-1986(2003) 镉电沉积涂层标准规范

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【英文标准名称】:StandardSpecificationforElectrodepositedCoatingsofCadmium
【原文标准名称】:镉电沉积涂层标准规范
【标准号】:ASTMB766-1986(2003)
【标准状态】:现行
【国别】:
【发布日期】:1986
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:B08.08
【标准类型】:(Specification)
【标准水平】:()
【中文主题词】:金属覆层;金属的;电解镀层;金属;覆层;镉
【英文主题词】:cadmium,electrodepositedcoatings;
【摘要】:1.1Thisspecificationcoverstherequirementsforelectrodepositedcadmiumcoatingsonproductsofiron,steel,andothermetals.Note18212;Cadmiumisdepositedasacoatingprincipallyonironandsteelproducts.Itcanalsobeelectrodepositedonaluminum,brass,berylliumcopper,copper,nickel,andpowdermetallurgyparts.1.2Thecoatingisprovidedinvariousthicknessesuptoandincluding25956;meitheraselectrodepositedorwithsupplementaryfinishes.1.3Cadmiumcoatingsareusedforcorrosionresistanceandforcorrosionpreventionofthebasismetalpart.Theas-depositedcoating(TypeI)isusefulforthelowestcostprotectioninamildornoncorrosiveenvironmentwhereearlyformationofwhitecorrosionproductsisnotdetrimentalorharmfultothefunctionofacomponent.Theprimepurposeofthesupplementarychromatefinishes(TypesIIandIII)ontheelectroplatedcadmiumistoincreasecorrosionresistance.Chromatingwillretardorpreventtheformationofwhitecorrosionproductsonsurfacesexposedtovariousenvironmentalconditionsaswellasdelaytheappearanceofcorrosionfromthebasismetal.1.4Cadmiumplatingisusedtominimizebi-metalliccorrosionbetweenhigh-strengthsteelfastenersandaluminumintheaerospaceindustry.Undercuttingofthreadsonfastenerpartsisnotnecessaryasthecadmiumcoatinghasalowcoefficientoffrictionthatreducesthetighteningtorquerequiredandallowsrepetitivedismantling.1.5Cadmium-coatedpartscaneasilybesolderedwithouttheuseofcorrosivefluxes.Cadmium-coatedsteelpartshavealowerelectricalcontactresistancethanzinc-coatedsteel.Thelubricityofcadmiumplatingisusedonspringsfordoorsandlatchesandforweavingmachineryoperatinginhighhumidity.Corrosionproductsformedoncadmiumaretightlyadherent.Unlikezinc,cadmiumdoesnotbuildupvoluminouscorrosionproductsonthesurface.Thisallowsforproperfunctioningduringcorrosiveexposureofmovingparts,threadedassemblies,valves,anddelicatemechanismswithoutjammingwithdebris.
【中国标准分类号】:A29
【国际标准分类号】:25_220_40
【页数】:9P.;A4
【正文语种】: