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Method for creating a corrosion-resistant aluminum surface

  • US 5,194,138 A
  • Filed: 07/20/1990
  • Issued: 03/16/1993
  • Est. Priority Date: 07/20/1990
  • Status: Expired due to Fees
First Claim
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1. A method for treating the surface of an aluminum-based material so as to make the surface resistant to corrosion, comprising the steps of:

  • (a) contacting the surface with an aqueous cerium non-halide solution for at least about 1 hour, the cerium non-halide solution having a pH of between about 4 and about 7 and being at a temperature of at least about 80°

    C.; and

    (b) contacting the metal surface from step (a) with an aqueous solution consisting essentially of a cerium halide for at least about 1 hour, the cerium halide solution having a pH of between about 4 and about 7 and being at a temperature of at least about 80°

    C.

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