Coating solution having trivalent chromium and manganese for coating metal surfaces
AssigneeAmchem Products, Inc.
InventorGeorge Schneider
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Abstract
A coating solution comprising trivalent chromium and one or more cations selected from the group consisting of manganese, bismuth, antimony tin, zinc and molybdenum is employed in a process wherein the solution is contacted with a metallic surface to form a corrosion resistant coating. The coating can be force dried or can be treated with a passivating solution.
Claims15
An aqueous acidic coating solution for forming a conversion coating on a metallic surface, consisting essentially of trivalent chromium and one or more cations selected from the group consisting of manganese, bismuth, antimony, tin, zinc and molybdenum, the trivalent chromium present in an amount of from about 0.1 g/l to about 2 g/l and the cation present in a stoichiometric equivalent amount of from about 0.2 g/l to about 1.0 g/l of manganese.
An aqueous acidic concentrate consisting essentially of trivalent chromium present as chromium nitrate and manganese present as manganese carbonate.
A process comprising contacting a metallic surface with a coating solution consisting essentially of trivalent chromium and one or more cations selected from the group consisting of manganese, bismuth, antimony, tin, zinc and molybdenum, the trivalent chromium present in an amount of from about 0.1 g/l to about 2 g/l and the cation present in a stoichiometric equivalent amount of from about 0.2 g/l to about 1.0 g/l of manganese.
Dependencies are inferred from the claim text.