Patent ID: 7291217

Claim:
A corrosion-inhibiting pigment composition comprising: a corrosion-inhibiting pigment comprising a rare earth element and a valence stabilizer combined to form a rare earth/valence stabilizer complex, wherein the rare earth element is selected from cerium, praseodymium, terbium, or a combination thereof, and at least one rare earth element is in the tetravalent oxidation state in the rare earth/valence stabilizer complex in the pigment composition, and wherein the rare earth/valence stabilizer complex has a solubility in water of between about 1×10 0 and about 1×10 −5 moles per liter of cerium, terbium, or praseodymium at about 25° C. and about 760 Torr; and a coating system comprising a carrier system and a binder system, or carrier system and a resin system, or both.