Patent ID: 6059867
Filing Date: 2000-05-09
Classification: C09D

Abstract:
A nonchromate, corrosion-inhibiting coating composition for a metal surface, said composition containing inhibitors, said inhibitors comprising:a synergistic amount of at least one compound selected from the group consisting of boric acid and salts thereof; dipotassium monohydrogen phosphate; calcium dihydrogen phosphate; ammonium dihydrogen phosphate; sodium dihydrogen phosphate; potassium dihydrogen phosphate; sodium pyrophosphate; calcium, strontium phosphosilicate; calcium, strontium, zinc phosphosilicate; tetrasodium orthosilicate; and mixtures thereof;a synergistic amount of at least one compound selected from the group consisting of: sodium titanium oxide, an inorganic zinc compound and an organo-zinc compound wherein the organo-zinc compound is selected from the group consisting of:Zn[L(CR.sub.1 R.sub.2).sub.n CH.sub.3 ].sub.2wherein L is selected from carboxyl, hydroxyl, sulfonyl, phosphyl, phosphonyl, sulfinyl, amino, cyano, imino, mercapto, nitro, nitroso, siloxy, sulfamino and sulfamyl; R.sub.1 and R.sub.2 are each independently hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 heteroatom containing alkyl, hydroxyl, carboxyl, and amino; n is an integer between 0 and 18 inclusive, mono-unsaturated analogs thereof, di-unsaturated analogs thereo fZn[L--(CR.sub.3 R.sub.4).sub.m --L']wherein L and L' are each independently selected from carboxyl, hydroxyl, sulfonyl, phosphyl, phosphonyl, sulfinyl, amino, cyano, imino, mercapto, nitro, nitroso, siloxy, sulfamino and sulfamyl; m is an integer between 1 and 8 inclusive; R.sub.3 and R.sub.4 are each independently selected from a group consisting of: hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 heteroatom containing alkyl, carboxyl, hydroxyl, sulfonyl, phosphyl, phosphonyl, sulfinyl, amino, cyano, imino, mercapto, nitro, nitroso, siloxy, sulfamino and sulfamyl, zinc (EDTA) complexes, and zinc containing polymer; andan effective film-forming amount of a carrier for said inhibitors, said carrier capable of placing said inhibitors in proximity with said metal surface.