Designation:B994/B994M−15StandardSpecificationforNickel-CobaltAlloyCoating1ThisstandardisissuedunderthefixeddesignationB994/B994M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationdescribestherequirementsforcorrosion-resistantcoatingsofelectrodepositednickel-cobaltonmetallicsubstratesandelectrodepositednickel-cobaltusedforelectroforming.NOTE1—Thenickel-cobaltalloyisprincipallydepositedasacoatingonsteelproducts.Itcanalsobeelectrodepositedoniron,stainlesssteel,aluminum,titaniumandanyothermetalsubstrate.NOTE2—Thenickel-cobaltalloycoatinghasalowcoefficientoffrictionof0.08thatprovidesadrylubricantonpartsurfacesthatareincontactwitheachotherandaresubjecttogalling.1.2Thisspecificationincorporatesanacceleratedexposuretestmethodtoevaluatetheeffectsofcorrosionandgallingonthecoating,andincorporatesameansofreportingtheresultstothepurchaser.1.3Thespecificationincorporatesaclassificationschemethatestablishesserviceconditionsforthickness,classesofdepositsbasedonthelevelofmonitoring,andtypebasedonsupplementalcoatingsusedafterdeposition.1.4Thecoatingthicknessrangesfrom5to>30µm,anditcanbeappliedtomachinedparts,springs,latches,threadedparts,fasteners,etc.Thedepositcanalsobeusedtoelectro-formpartsrequiringhighstrengthwiththealloybeingmain-tainedat50%nickel-cobalt.1.5Thenickel-cobaltalloyisusedtoprotectferrousmetalsincontactwithcorrosiveenvironmentssuchas:oilandgasproductionfacilities,costalmarine,andACQ(AlkalineCopperQuaternary)treatmentsforwoodtreatments.1.6ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.7Thisstandarddoesnotpurporttoad...
