Passivation method and composition for galvanized metal surfaces
AssigneeBetzDearborn Inc.
InventorsJiangbo Ouyang, William L. Harpel
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Abstract
Compositions and methods for passivating galvanized metal surfaces are disclosed. The addition of a paraffin wax, preferably emulsified with nonionic surfactants to commercial passivation treatment (non-chrome) enhances passivation.
Claims4
A process for passivating a galvanized metal surface with a substantially chromium free passivation treatment comprising including in said substantially chromium free passivation treatment from about 0.1% to about 20% by weight of a paraffin wax having a melting point of from about 90.degree. to 200.degree. F. and from about 1% to about 20% by weight of one or more nonionic surfactants having HLB values of from about 2 to about 18.
A process for passivating a galvanized metal surface with a substantially chromium free passivation treatment comprising including in said substantially chromium free passivation treatment from about 0.1% to about 20% by weight of a paraffin wax having a melting point of from about 90.degree. to 200.degree. F. and from about 1% to about 20% by weight of one or more nonionic surfactants having HLB values of from about 2 to 18 and about 0.1 to 1% by weight of a tetrafluoroethylene fluorocarbon polymer dispersion.
Dependencies are inferred from the claim text.