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1、DIN50902-1994金属材料防腐涂层;词汇,表面处理,应用DEUTSCHENORMJulv1994ProtectivecoatingsonmetalsDIN-I50902IConcepts,applicationmethodsandsurfacepreparationICs25.220.20SupersedesJuly1975edition.SchichtenfürdenKorrosionsschutzvonMetallen;Begriffe,VerfahrenundOberfl??chenvorbereitungDescriptors:Corrosionprotection,me
2、tals,coatings,surfacepreparation.1Thisstandarddefinesconceptsrelatingtocoatingsforthecorrosionprotectionofmetals,providesanoverviewofthemethodsofapplyingsuchcoatings,describesvariousmethodsofsurfacepreparation,andlistsrele-vantstandards.Scopeandfieldofapplication2Concepts2.1ProtectivecoatingsFort
3、hepurposesofthisstandard,protectivecoatingsareone-layerormulti-layercoatingsappliedtoorformedonmetalsurfacesinordertoprovidecorrosionprotection.Multi-layercoatingsarealsoreferredtoas‘corrosionprotectionsystems’(cf.DIN50900-1).2.1.1Organiccoatings*)Forthepurposesofthisstandard,anorganiccoatingcons
4、istsofcoatingmaterialsasdefinedinsubclause2.2.2.1.2Inorganiccoatings*)Forthepurposesofthisstandard,inorganiccoatingsconsistofmetalsornon-metalsandareformedbyvari-ousprocesses(e.g.electrochemicalconversionordiffu-sion).NOTE:Somecoatingscanbedesignatedbothasaconversionandasadiffusioncoating.*)Trans
5、lator’snote.TheGermanoriginalmakesadis-tinctionbetweenBeschichtungen(non;metallic,appliedcoatings;cf.subclause3.1)andUberzüge(metalliccoatingsappliedorformedonthesubstrate,andnon-metalliccoatingsformedonthesubstrate;cf.subclause3.2).ThisdistinctionisirrelevantinEng-lish,asbothtermsaretranslatable
6、as‘coatings’.Instead,adivisionmoreappropriatetotheEnglishlanguagewaschosen,??.e.,theusualdistinctionbetweenorganicandinorganiccoatings,thelatterencompassingmetallic,conversion,andnon-metallicdiffusioncoatings.Asaresultofthisextensiverear-rangement,thesubclauseshavebeenrenumbered.AstheEnglishtrans
7、lationofUmhüllung(externalcoating)isself-explanatory,ithasnotbeendefinedhere(cf.subclause2.1.4intheGermanoriginal).2.1.2.1ConversioncoatingsConversioncoatingsareformedbyachemicalorelec-trochemicalreactionofthemetalsubs
