Cobalt based NON-TOXIC

September 12, 2008

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 5×10−1 and about 1×10−5 moles per liter of cobalt at approximately 25°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.

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