Tri-cation zinc phosphate conversion coating and process of making the same
AssigneeGE Betz, Inc.
InventorsEdward A. Rodzewich, Bruce V. Haberle, Joseph E. Murphy
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Abstract
Tri-cation zinc phosphate conversion coating compositions are disclosed. The compositions include a phosphate component, ions of nickel, manganese, and zinc, and a glycerophosphate component, such as disodium glycerophosphate. Coatings formed from these compositions provide improved corrosion resistance to metal substrates and provide a uniform layer for the application of paint finishes. Processes of making and using these compositions are also disclosed.
Claims41
A coating composition for metal substrates, comprising:
- a) a tri-cationic phosphate composition which includes a phosphate component and ions of nickel, manganese, and zinc;
- and
- b) a glycerophosphate compound,
- wherein said composition is capable of providing anti-corrosion properties to metal substrates when applied thereto, and said zinc ions are present in an amount of 2000 parts per million or less.
A method of improving the anti-corrosion properties of metal substrates, comprising the steps of:
- a) providing a coating composition, said coating composition comprising phosphate ions, nickel ions, manganese ions, zinc ions, and disodium glycerophosphate;
- and
- b) coating a metal substrate with said coating composition
- wherein said zinc ions are present in an amount of 2000 parts per million or less.
Dependencies are inferred from the claim text.