Designation:B877−96(Reapproved2013)StandardTestMethodforGrossDefectsandMechanicalDamageinMetallicCoatingsbythePhosphomolybdicAcid(PMA)Method1ThisstandardisissuedunderthefixeddesignationB877;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisteststandardcoversequipmentandmethodsforusingphosphomolybdicacid(PMA)todetectgrossdefectsandmechanicaldamageincludingwearthroughinmetalliccoat-ingsofgold,silver,orpalladium.Thesemetalscomprisethetopmostmetalliclayersoversubstratesofnickel,copper,orcopperalloys.1.2Recentreviewsofporositytesting,whichincludethoseforgrossdefects,andtestingmethodscanbefoundintheliterature.2,3AnASTMguidetotheselectionofporosityandgrossdefecttestsforelectrodepositsandrelatedmetalliccoatingsisavailableasGuideB765.OtherrelatedporosityandgrossdefectsteststandardsareTestMethodsB735,B741,B798,B799,B809,andB866,SpecificationsB488,B679,andB689.1.3ThevaluesstatedinSIunitsarethepreferredunits.Thoseinparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:4B374TerminologyRelatingtoElectroplatingB488SpecificationforElectrodepositedCoatingsofGoldforEngineeringUsesB542TerminologyRelatingtoElectricalContactsandTheirUseB679SpecificationforElectrodepositedCoatingsofPalla-diumforEngineeringUseB689SpecificationforElectroplatedEngineeringNickelCoatingsB735TestMethodforPorosityinGoldCoatingsonMetalSubstratesbyNitricAcidVaporB741TestMethodforPorosityInGoldCoatingsOnMetalSubstratesByPaperElectrography(Withdrawn2005)5B765GuideforSelectionofPorosityandGrossDefectTestsforElectrodepositsandRelatedMetallicC...
