AQUEOUS COATING SOLUTIONS, ACIDS, ZINC PHOSPHATE, CONCENTRATES FOR MAKING THE SAME, ACTIVATION SOLUTIONS AND PROCESSES FOR THEIR IMPLEMENTATION

摘要

Aqueous compositions and low temperature processes for treating clean steel and galvanized steel to provide a coating suitable for the application of paint thereto. The aqueous treating compositions contain:PP______________________________________ P PIngredient Quantity PP ______________________________________ PPzinc ion from about 0.9 to about 2.5 g/l; PPnickel ion from about 0.6 to about 2.0 g/l; PPorthophosphoric acid P P from about 15 to about 45 g/l; PPnitrate ion from about 1.0 to about 10.0 g/l. PP ______________________________________ PPP PThe pH of the composition is adjusted to 3.0-3.5 by addition of alkali metal hydroxide. The above composition is used on clean galvanized steel. For clean ungalvanized steel, from about 0.10 to about 0.65 g/l of nitrite ion is included in the composition. Optional ingredients in the above compositions include chlorate ion, ferric ion, and a fluoride compound.PPThe invention also relates to a metal activating composition comprising an aqueous colloidal solution of manganese ion and a titanium compound.