Non-chrome passivation of steel

摘要

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.

主权项

1. 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.