Active aluminum rich coatings

A chromate-free corrosion-inhibiting coating composition for application onto metal substrates consisting essentially of, in parts by weight, from about

• 20 to 40 parts of a film-forming binder, selected from the group consisting of polyacrylates, polyurethanes, polyimides, polymers derived from epoxies, polymers derived from isocyanates, and an uncured pre-polymers of said polymers,
• 50 to 70 parts of galvanic aluminum alloy powder prepared in an oxygen or nitrogen-hydrogen atmosphere having particle sizes ranging from about 20 to 100 microns;
• said aluminum alloy powder consisting essentially of the formula:
• Aluminum-Zinc-X (AlZnX), wherein X is an element selected from the group consisting of indium, gallium, tin, and bismuth, from about
• 0.0 to 2.0 parts of at least one wetting agent, from about
• 2.0 to 6.0 parts of at least one corrosion inhibitor selected from the group consisting of inorganic talcite clay, benzimidazole, benzothiazole, benzoxazole, diphenyltriazole, benzotriazole and tolyltriazole, and effective amounts of an organic solvent.

Process for inhibiting the corrosion of a metal substrate which comprises coating said metal substrate with an effective amount of a chromate-free corrosion-inhibiting coating composition consisting essentially of, in parts by weight, from about,

• 15 to 50 parts of a film-forming binder selected from the group consisting of polyacrylates, polyurethanes, polyimides, polymers derived from epoxies, polymers derived from isocyanates, and an uncured pre-polymers of said polymers,
• 40 to 85 parts of a galvanic aluminum alloy powder having a particle size ranging from about 10 to 100 microns;
• said aluminum alloy powder prepared in an atmosphere of oxygen or nitrogen-hydrogen and having the formula:
• Aluminum-Zinc-X (AlZnX), wherein X is an element selected from the group consisting of indium, gallium, tin and bismuth, from about
• 0.0 to 2.0 parts of at least one wetting agent, from about
• 1.0 to 10 parts of at least one corrosion inhibitor selected from the group consisting of an inorganic talcite clay, benzimidazole, benzothiazole, benzoxazole, diphenyltriazole, benzotriazole, and tolyltriazole, effective amounts of solvent and subsequently curing said coating composition.

A process for inhibiting the corrosion of a metal substrate which comprises coating said metal substrate with an effective amount of a chromate-free corrosion-inhibiting coating composition consisting essentially of, in parts by weight, from about

• 20 to 40 parts of a film-forming binder selected from the group consisting of polyacrylates, polyurethanes, polyimides, polymers derived from epoxies, polymers derived from isocyanates, and an uncured pre-polymers of said polymers,
• 50 to 70 parts of a galvanic aluminum-alloy powder prepared in an atmosphere of oxygen and having a particle size ranging from about 20 to 45 microns;
• said aluminum alloy powder having the formula:
• Aluminum-Zinc-X (AlZnX), wherein X is an element selected from the group consisting of indium, gallium, tin, and bismuth, from about
• 0.1-1.5 parts of at least one wetting agent, from about
• 2.0 to 6.0 parts of a least one corrosion inhibitor selected from the group consisting of an inorganic talcite clay, benzimidazole, benzothiazole, benzoxazole, diphenyltriazole, benzotriazole and tolyltriazole, effective amounts of solvent and subsequently curing said composition to form the coating.