Cobalt based non-toxic corrosion-protection coating.

Patent No. U.S. 7,294,211 B2

University of Dayton, Dayton, OH has been granted a patent for a solid corrosion-inhibiting conversion coating formed on a substrate metal. The conversion coating is comprised of cobalt, wherein the cobalt is trivalent cobalt, or tetravalent cobalt, or combinations thereof, and a valence stabilizer combined to form a cobalt/valence stabilizer complex within the solid corrosion-inhibiting conversion coating, and wherein the cobalt/valence stabilizer complex has a solubility in water of between about 5x[10.sup.-1] and about 1x[10.sup.-5] moles per liter of cobalt at approximately 25[degrees]C and 760 Torr, and wherein the valence stabilizer is selected from an organic valence stabilizer and an inorganic valence stabilizer, with the proviso that the inorganic valence stabilizer is not a vanadate or a tungstate, and the organic valence stabilizer is not a carboxylate.