Accession Number:

ADD019813

Title:

Trivalent Chromium Solutions for Sealing Anodized Aluminum

Descriptive Note:

Patent, Filed 1 Oct 1993, patented 20 Dec 1994

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

1994-12-20

Pagination or Media Count:

8.0

Abstract:

Corrosion resistant seal-coatings are formed on anodized aluminum by immersion in aqueous solutions containing trivalent chromic compounds with an alkali added near or slightly beyond the precipitation of insoluble basic compounds. Trivalent chromium seals formed on the anodized aluminum when tested in 5 NaCl salt spray chamber showed improved corrosion resistance. After a post-treatment in a peroxide or permanganate solution, the corrosion resistance for the anodized aluminum showed even greater improvement in the salt chamber.

Subject Categories:

  • Inorganic Chemistry
  • Physical Chemistry
  • Adhesives, Seals and Binders
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE