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Dyed trivalent chromium conversion coatings and methods of using same

  • US 10,533,254 B2
  • Filed: 01/31/2018
  • Issued: 01/14/2020
  • Est. Priority Date: 02/01/2017
  • Status: Active Grant
First Claim
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1. A trivalent chromium conversion coating solution comprising:

  • approximately 0.1 g/liter to approximately 20 g/liter of a trivalent chromium compound;

    approximately 0.2 g/liter to approximately 20 g/liter of a zirconate compound; and

    approximately 0.01 wt % to approximately 2 wt % of mordant dye, the mordant dye comprising a chromium complex azo dye or a triphenylmethane dye;

    wherein the conversion coating solution is an aqueous solution and has a pH of at least 2.5; and

    wherein the trivalent chromium conversion coating solution is capable of satisfying the corrosion resistance requirement of MIL-DTL-81706B Class 1A.

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