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US 8,980,015 B2Granted
Non-chrome passivation of steel
AssigneeChemtall Corporation
InventorsAndrea Keys, Jeffrey I. Melzer, Michael T. Raab
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Abstract
Chromate free treatments and compositions for applying a conversion or passivation coating to metal surfaces. Preferred compositions comprise a film forming latex polymer, fluoacid, phosphoric acid, and a polyoxyethylene/oxypropylene block copolymer. The requisite metal surfaces are contacted by the compositions and dried. Rinsing is optional.
Claims12
A method of forming a conversion or passivation coating on a metal surface comprising contacting said metal surface with a chromate free aqueous treatment composition comprising:
- (a) 1-20 wt % of a film forming latex polymer;
- (b) 1-40 wt % of a fluoacid;
- (c) 1-50 wt % of a phosphoric acid;
- and
- (d) 0.01-15 wt % of a non-ionic polyoxyethylene/polyoxypropylene block copolymer surfactant.
2 more elements
Dependencies are inferred from the claim text.