Patent ID: 6835460
Filing Date: 2004-12-28
Classification: C09D,C23C,Y10T

Abstract:
An article of manufacture comprising:(I) a metal workpiece, and (II) a dried amorphous conversion coating on a metallic surface of the metal workpiece, said amorphous conversion coating comprising the reaction product of: (a) the metallic surface of the workpiece and (b) a composition comprising water and the following dissolved components: (i) a concentration of from about 1.0 to about 400 g/l of phosphate ions, measured as their stoichiometric equivalent as orthophosphoric acid; (ii) a concentration, in g/l, of zinc cations that has a ratio to said concentration of phosphate ions, measured as their stoichiometric equivalent as orthophosphoric acid, that is from about 0.003:1.0 to about 0.10:1.00; (iii) a concentration, in g/l, of calcium cations that has a ratio to the concentration of phosphate ions, measured as their stoichiometric equivalent as orthophosphoric acid, in the liquid composition, both of these concentrations being measured in g/l, that is from about 0.007:1.00 to about 0.30:1.00; (iv) at least one adhesion-promoting substance selected from the group consisting of: a) film-forming organic substances, b) amino-phenolic polymers, and c) inorganic oxides of one of the elements silicon, aluminum, titanium, and zirconium.