Environmentally friendly coating compositions
AssigneeSermatech International, Inc.
InventorsMark F. Mosser, Kevin B. Eddinger
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Abstract
An aqueous phosphoric bonding solution and coating composition slurry which are environmentally friendly in that they are generally free of molybdate or chromium. Yet the solution is stable with respect to inorganic metal particles, especially aluminum which are admixed to the bonding solution for the preparation of the coating slurry. The metal coated parts and the method of coating the parts with the coating composition are also described. The parts have very satisfactory properties.
Claims19
An aqueous phosphoric acid coating composition which comprises a source of magnesium and a source of aluminum ions, and aluminum particles, the solution having a pH in the range of 2 to 4.5, and the amount of aluminum in solution being less than necessary to equilibrate the solution with respect to addition of the aluminum particles, the composition being substantially free of chromate and molybdate, and being substantially unreactive with respect to the aluminum powder.
An aqueous phosphoric acid coating composition having a pH in the range of 2 to 4.5 and comprising a source of magnesium ions and a source of zinc and of borate ions.
Dependencies are inferred from the claim text.