Chromate-free phosphate bonding composition
AssigneeSermatech International, Inc.
InventorsJohn E. Hughes, Mark F. Mosser, Kevin B. Eddinger, Ronald E. Myers
Life of this patent
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Abstract
A heat curable bonding composition for providing a coating to a solid substrate comprises water, phosphate ions, borate ions, and aluminum ions. The bonding composition has a pH in the range from about 1.4 to about 2.2, and is substantially free of chromate ions, molybdate ions, and magnesium ions.
Claims29
A heat curable bonding composition for coating a solid substrate, the composition comprising:
- a. water;
- b. phosphate ions;
- c. borate ions;
- d. aluminum ions;
- wherein the composition has a pH in the range from about 1.4 to about 2.2;
- and wherein the composition is substantially free of chromate ions, molybdate ions, and magnesium ions.
A heat curable coating composition comprising metallic aluminum particles dispersed in a bonding composition, the bonding composition comprising:
- a. water;
- b. phosphate ions;
- c. borate ions;
- d. aluminum ions, wherein the amount of aluminum ions in solution is less than necessary to equilibrate the solution with respect to the metallic aluminum particles;
- wherein the composition has a pH in the range from about 1.4 to about 2.2;
- and wherein the composition is substantially free of chromate ions, molybdate ions, and magnesium ions.
An article of manufacture comprising a substrate with a coating, the coating prepared in accordance with a method comprising the steps of:
- a. providing a heat curable coating composition comprising metallic aluminum particles dispersed in a bonding composition, the bonding composition comprising:
- i) water;
- ii) phosphate ions;
- iii) borate ions;
- iv) aluminum ions, wherein the amount of aluminum ions in solution is less than necessary to equilibrate the solution with respect to the metallic aluminum particles;
- wherein the composition has a pH in the range from about 1.4 to about 2.2;
- and wherein the composition is substantially free of chromate ions, molybdate ions, and magnesium ions;
- b. applying the coating composition to the substrate;
- and
- c. heating the substrate with the coating composition applied thereon to form a heat cured coating.
An article of manufacture comprising a substrate with a coating, the coating prepared in accordance with a method comprising the steps of:
- a. providing a heat curable topcoat coating composition comprising:
- i) water;
- ii) phosphate ions;
- iii) borate ions;
- iv) aluminum ions, and
- wherein the coating composition has a pH in the range from about 1.4 to about 2.2;
- and wherein the composition is substantially free of chromate ions, molybdate ions, and magnesium ions;
- b. applying the coating composition to the substrate;
- and
- c. heating the substrate with the coating composition applied thereon to form a heat cured coating.
Dependencies are inferred from the claim text.