(A.) A process for forming a cobalt conversion coating on a metal substrate, thereby imparting corrosion resistance and paint adhesion properties. The invention was developed as a replacement for the prior art chromic acid process. The substrate may be aluminum or aluminum alloy, as well as magnesium...http://www.google.com/patents/US5472524?utm_source=gb-gplus-sharePatent US5472524 - Non-chromated cobalt conversion coating method and coated articles
