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Post-treatment for metal coated substrates

  • US 6,663,700 B1
  • Filed: 01/23/2003
  • Issued: 12/16/2003
  • Est. Priority Date: 10/31/2000
  • Status: Expired due to Term
First Claim
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1. A process for post-treating metal coated substrates to provide color recognition, and improve the corrosion-resistance, abrasion, and adhesion properties which comprises treating the metal coated substrates with an acidic aqueous solution having a pH ranging from about 2.5 to 5.5 comprising, per liter of said solution, from about 0.01 to 22 grams of a water soluble trivalent chromium compound, about 0.01 to 12 grams of an alkali metal hexafluorozirconate, about 0.0 to 12 grams of a least one fluoro-compound selected from the group consisting of alkali metal tetrafluoroborates, alkali metal hexafluorosilicates and mixtures thereof, from about 0.001 to 10 grams of a divalent zinc compound, from 0 to 10 grams of at least one water soluble thickener and from 0 to 10 grams of at least one water soluble surfactant.

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