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【英文标准名称】:StandardSpecificationforElectrodepositedCoatingsofPalladiumforEngineeringUse
【原文标准名称】:工程用钯的电沉积覆层的标准规范
【标准号】:ASTMB679-1998(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1998
【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】:B08.08.02
【标准类型】:(Specification)
【标准水平】:()
【中文主题词】:
【英文主题词】:connectors;contacts;electricalconnectors;electricalcontacts;engineeringcoatings;palladium;palladiumcoatings;palladiumelectrodeposits;palladiumplatings;ElectrodepositedPdcoatings--specifications;Engineeredelectrodepositedcoatings--spec
【摘要】:1.1Thisspecificationcoversrequirementsforelectrodepositedpalladiumcoatingscontainingatleast99.7mass%ofpalladiummetal.Compositecoatingsconsistingofpalladiumwithathingoldoverplateforapplicationsinvolvingelectricalcontactsarealsocovered.1.2Properties8212;Palladiumisthelightestandleastnobleoftheplatinumgroupmetals.Ithasaspecificgravityof12.0,whichissubstantiallylessthangold(19.3)andplatinum(21.5).Thisyieldsagreatervolumeorthicknessofcoatingand,consequently,somesavingofmetalweightaccompaniedbyasmallsacrificeincorrosionresistanceandreflectivity.Thefollowingtablecomparesthehardnessrangeofelectrodepositedpalladiumwithotherelectrodepositednoblemetalsandalloys(1,2).
ApproximateHardness(HK25)
Gold
50x2013;250
Palladium
75x2013;600
Platinum
150x2013;550
Palladium-Nickel
300x2013;650
Rhodium
750x2013;1100
Ruthenium
600x2013;1300