Chrome free treatment for aluminum
First Claim
1. A method of coating an aluminum or aluminum alloy metal surface comprising contacting said surface with an effective amount of a chromate free, acidic aqueous treatment solution comprising a (a) water soluble fluoacid of a Group IVB (CAS) metal or mixtures thereof, (b) fluoboric acid, (c) boric acid, (d) gluconic acid, and, optionally a topping agent (e) wherein said topping agent is selected from the group of (ei) aminosilane adhesion promoter and/or (eii) organophosphonate corrosion inhibitors.
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Abstract
A chromate free conversion coating for Al based metals and methods of use. The compositions comprise (a) water soluble fluoacids of Group IVB metals, (b) fluoboric acid, (c) boric acid, (d) gluconic acid and, optionally (e) an aminosilane adhesion promoter or an organophosphonate corrosion inhibitor. In the method, the requisite metal part is contacted by the composition such as by immersion or spraying or the like.
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Citations
14 Claims
- 1. A method of coating an aluminum or aluminum alloy metal surface comprising contacting said surface with an effective amount of a chromate free, acidic aqueous treatment solution comprising a (a) water soluble fluoacid of a Group IVB (CAS) metal or mixtures thereof, (b) fluoboric acid, (c) boric acid, (d) gluconic acid, and, optionally a topping agent (e) wherein said topping agent is selected from the group of (ei) aminosilane adhesion promoter and/or (eii) organophosphonate corrosion inhibitors.
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9. Chromate free aqueous conversion coating adapted for contact with an aluminum or aluminum alloy surface, said composition comprising:
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(a) water soluble fluoacid of a Group IVB (CAS) metal or mixtures of said fluoacids (b) fluoboric acid (c) boric acid (d) gluconic acid and (e) a topping agent, wherein said topping agent is selected from the group consisting of (ei) aminosilane adhesion promoters and/or (eii) organophosphonate corrosion inhibitors. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification