ASTM B-733-97 金属表面化学镀镍磷层规范标准

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1、Designation:B733–97StandardSpecificationforAutocatalytic(Electroless)Nickel-PhosphorusCoatingson1MetalThisstandardisissuedunderthe®xeddesignationB733;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesi

2、ndicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.8Themediumphosphorouscoatings(5to9%P)aremost1.1Thisspeci®cationcoversrequirementsforautocatalyticwidel

3、yusedtomeetthegeneralpurposerequirementsofwear(electroless)nickel-phosphoruscoatingsappliedfromaqueousandcorrosionresistance.solutionstometallicproductsforengineering(functional)uses.1.9Thehighphosphorous(morethan10%P)coatings1.2Thecoatingsarealloysofnickelandphosphoruspro-havesuperiorsalt-s

4、prayandacidresistanceinawiderangeofducedbyautocatalyticchemicalreductionwithhypophosphite.applications.TheyareusedonberylliumandtitaniumpartsforBecausethedepositednickelalloyisacatalystforthereaction,lowstressproperties.Coatingswithphosphoruscontentstheprocessisself-sustaining.Thechemicaland

5、physicalgreaterthan11.2%Parenotconsideredtobeferromagnetic.propertiesofthedepositvaryprimarilywithitsphosphorus1.10ThevaluesstatedinSIunitsaretoberegardedascontentandsubsequentheattreatment.Thechemicalmakeupstandard.oftheplatingsolutionandtheuseofthesolutioncanaffectthe1.11Thefollowingprecau

6、tionarystatementpertainsonlytoporosityandcorrosionresistanceofthedeposit.Formorethetestmethodportion,Section9,ofthisspeci®cation.Thisdetails,seeASTMSTP265(1)2andRefs(2)(3)(4)and(5)standarddoesnotpurporttoaddressallofthesafetyconcerns,alsorefertoFigs.X1.1,Figs.X1.2,andFigs.X1.3intheifany,asso

7、ciatedwithitsuse.ItistheresponsibilityoftheuserAppendixofGuideB656.ofthisstandardtoestablishappropriatesafetyandhealth1.3Thecoatingsaregenerallydepositedfromacidicsolu-practicesanddeterminetheapplicabilityofregulatorylimita-tionsoperatingatelevated