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Trivalent Chromium-Containing Composition for Use in Corrosion Resistant Coatings on Metal Surfaces

  • US 20100132843A1
  • Filed: 05/10/2007
  • Published: 06/03/2010
  • Est. Priority Date: 05/10/2006
  • Status: Active Grant
First Claim
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1. A composition for coating a metal surface, said composition comprising water and:

  • (A) a component of fluorometallate anions, each of said anions consisting of;

    (i) at least four fluorine atoms; and

    (ii) at least one atom of an element selected from the group consisting of titanium, zirconium, hafnium, silicon, aluminum, and boron, and, optionally, one or both of(iii) at least one ionizable hydrogen atom; and

    (iv) at least one oxygen atom;

    (B) a component of water soluble chromium fluoride;

    said composition being substantially free of hexavalent chromium and storage stable at ambient temperature for at least 2 weeks.

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