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US 5,470,613 AGranted
Composition and method of forming a black no-rinse conversion coating on metal surfaces
AssigneeBetz Laboratories, Inc.
InventorEdward A. Rodzewich
Life of this patent
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Abstract
A black, no-rinse conversion coating on metal surfaces is provided. The treatment of a metal such as aluminum or aluminum alloys with a composition of hexavalent chromium, an acrylic/itaconic modified styrene butyl acrylate polymer resin, a fluoacid, and carbon black results in a black no-rinse conversion coating.
Claims4
A method of forming a black conversion coating on surfaces of aluminum and its alloys comprising:
- coating the surface with a coating solution having a pH below 7 consisting essentially of
- a. from about 0.01 to about 0.20% hexavalent chromium;
- b. from about 2.0 to about 10% acrylic/itaconic modified styrene butyl acrylate polymer resin (as solid);
- c. from about 0.5 to about 3.0% carbon black pigment;
- d. from about 0.2 to about 1.0% fluoacid;
- e. a thickening agent selected from the group consisting of guar gum and xanthan gum and drying said coating on said surface without rinsing;
- and optionally
- f. a non-ionic dispersant and/or a slow evaporating coalescent.
5 more elements
A fluid composition of matter, consisting essentially of:
- a. from about 0.01 to about 0.20% hexavalent chromium;
- b. from about 2 to about 10% acrylic/itaconic modified styrene butyl acrylate polymer resin (as solid);
- c. from about 0.5 to about 3.0% carbon black pigment;
- d. from about 2.2 to about 1.0% fluoacid;
- e. a thickening agent selected from the group consisting of guar gum and xanthan gum;
- and optionally
- f. a non-ionic dispersant and/or a slow evaporating coalescent.
4 more elements
Dependencies are inferred from the claim text.