Patent ID: 8277688

Claim:
An electrochemically corrosion-resistant composition for application onto metal substrates consisting essentially of, in parts by weight, from about 5 to 80 parts of a film-forming binder selected from the group consisting of an inorganic binder, polyurethanes, polyimides, polyacrylates, polymers derived from diisocyanates, polymers derived from epoxies and the uncured prepolymers of said polymers, from about 0.0 to 10 parts of at least one ionic-corrosion inhibitor, from about 0.0 to 5.0 parts of at least one wetting agent, from about 0.0 to 5.0 parts of solvent, and from about 20 to 80 parts of a galvanic aluminum alloy powder-pigment prepared in an atmosphere selected from the group consisting of oxygen, nitrogen/inert gas and nitrogen-hydrogen having a particle size ranging from about 2 to 100 microns; said aluminum alloy powder-pigment coated with an effective amount of a semi-conducting corrosion inhibitor and has the formula Aluminum-X—Y, wherein X is an element selected from the group consisting of zinc, cadmium, magnesium, barium, and manganese and Y is an element selected from the group consisting of indium, gallium, tin and bismuth; said semi-conducting corrosion inhibitor consist essentially of an acidic aqueous solution of from about 0.01 to 22 parts of a trivalent chromium compound, from about 0.01 to 12 parts of hexafluorozirconate, from about 0.01 to 12 parts of at least one fluorocarbon selected from the group consisting of tetra fluoroborates, hexafluorosilicates, and hexafluorotitanates, from about 0.00 to 12 parts of at least one divalent zinc compound, and from about 0.00 to 5 parts by weight of a water soluble organic corrosion inhibitor.