Process of protecting metal substrates with corrosion-resistant compositions
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsCraig Matzdorf, William Nickerson
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Abstract
This invention relates to galvanic aluminum alloy powder-pigments coated with semi-conducting corrosion-inhibiting compositions and particularly to the process for preparing said coated powder-pigments for coating substrates to inhibit corrosion. The coated aluminum alloy powder-pigments are electrically active and prevent corrosion of metals which are more cathodic (electropositive) than the coated-aluminum alloy pigments.
Claims16
A process for protecting a metal substrate from corrosion which comprises coating said metal substrate with up to about 10 mils of an electrochemically corrosion-resistant composition comprising in parts by weight, from about
- 5 to 80 parts of a film-forming binder, 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 and has 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-inhibiting coating, 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.
Dependencies are inferred from the claim text.