The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 1999
Filed:
Dec. 26, 1996
Matthias P Schriever, Kent, WA (US);
The Boeing Company, Seattle, WA (US);
Abstract
An improved process that is commercially practical for forming an oxide film cobalt conversion coating exhibiting corrosion resistance and paint adhesion properties on an aluminum or aluminum alloy substrate (for example, aerospace and aircraft parts), the process including the steps of: (a) providing an oxide film forming cobalt conversion solution including an aqueous reaction solution, containing no triethanolamine (TEA), prepared by reacting the following starting materials: (1) a water soluble cobalt-II salt; (2) a water soluble ammonium salt; (3) a water soluble inorganic complexing agent selected from the group consisting of water soluble metal nitrites; (4) a water soluble organic complexing agent; and (5) a water soluble oxidizing agent; and (b) contacting the aluminum or aluminum alloy substrate with the aqueous reaction solution for a sufficient amount of time to oxidize the surface of the substrate, whereby the oxide film cobalt conversion coating is formed, thereby imparting corrosion resistance and paint adhesion properties to the substrate. Also an improved chemical conversion coating solution that is commercially practical for producing an oxide film cobalt conversion coating on a metal substrate, said solution comprising an aqueous reaction solution, containing no triethanolamine (TEA), prepared by reacting the following starting materials: (1) a water soluble cobalt-II salt; (2) a water soluble ammonium salt; (3) a water soluble inorganic complexing agent selected from the group consisting of water soluble metal nitrites; (4) a water soluble organic complexing agent; and (5) a water soluble oxidizing agent.