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WSS-M21P44-A1 to A4-20040914-镀锌镍合金三价铬钝化表面处理-eng.pdf

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ENGINEERINGMATERIALSPECIFICATION

CORROSIONPROTECTIVECOATING,ZINCNICKELALLOY,WSS-M21P44-A1

TRIVALENTPASSIVATE,SILVER

CORROSIONPROTECTIVECOATING,ZINCNICKELALLOY,WSS-M21P44-A2

TRIVALENTPASSIVATEWITHORGANICSEAL,SILVER

CORROSIONPROTECTIVECOATING,ZINCNICKELALLOY,WSS-M21P44-A3

TRIVALENTPASSIVATEWITHCATHODICELECTROCOAT,

BLACK

CORROSIONPROTECTIVECOATING,ZINCNICKELALLOY,WSS-M21P44-A4

TRIVALENTPASSIVATEWITHWATERBORNETOPCOAT,

BLACK

1.SCOPE

Thematerialsdefinedbythesespecificationsarecorrosionprotectivecoatingsappliedsequentiallyper

supplierspecificationsoversteel.Theyconsistofanalkalinezincnickelalloyelectrodepositanda

trivalentchromiumpassivate/adhesionpromoter.A2,A3andA4arefollowedrespectivelybyan

organicseal,acathodicelectrocoat,orawaterbornetopcoat.Whenusedwithanintegrallycured

torquemodifiedpostdip,theseprocessesprovideconsistenttorque-tensioncontrol.

Allprocessesarefreeofhexavalentchromium,leadandcadmium.

2.APPLICATION

Thesespecificationswerereleasedformaterialsusedascorrosionprotectivecoatingsoversteel

fastenersandsmallparts.Theprocessesmayinducehydrogenembrittlementandthereforethese

coatingsmustbehydrogenembrittlementrelievedwhenappliedtohighhardnesspartsinaccordance

withWSS-M99A3-A.

ThecuretemperatureoftheorganicsealusedforA2is80to120°C.

Thecuretemperatureofthecathodicsyste

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