Patent Number: 6,248,184

Title: Use of rare earth metal salt solutions for sealing or anodized aluminum for corosion protection and paint adhesion

Abstract: A process for sealing the surface coating formed by anodizing an aluminum or aluminum alloy substrate (for example, aerospace, commercial, and architectural products), the process including the steps of: (a) providing an aluminum or aluminum alloy substrate with a surface coating formed thereon by anodizing the aluminum or aluminum alloy substrate; (b) providing a sealing solution comprising a dilute solution of a rare earth metal salt selected from the group consisting of cerium salts and yttrium salts; and (c) contacting the substrate with the sealing solution for a sufficient amount of time to seal the surface coating on the substrate. Also disclosed is a chemical sealing solution for sealing the surface coating formed by anodizing an aluminum or aluminum alloy substrate, the solution being a dilute solution of a rare earth metal salt selected from the group consisting of cerium salts and yttrium salts.

Inventors: Dull; Dennis L. (Sumner, WA), Mansfeld; Florian B. (Santa Monica, CA)

Assignee: The Boeing Company

International Classification: C25D 11/18 (20060101); C25D 11/24 (20060101); C23C 28/00 (20060101); C23C 30/00 (20060101); C23C 022/56 (); C23C 028/00 (); C04B 009/02 (); C09K 003/00 (); B05D 001/36 ()

Expiration Date: 06/19/2018