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Chrome free treatment for aluminum

  • US 20040094235A1
  • Filed: 11/18/2002
  • Published: 05/20/2004
  • Est. Priority Date: 11/18/2002
  • Status: Abandoned Application
First Claim
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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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