Black corrosion resistant coating and method for a metal substrate
AssigneeDepor Industries
InventorPeter E. Pelloski
Life of this patent
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Abstract
A black corrosion resistant coating composition which is applied to a metal substrate as a wet film and heated to dry and initiate curing to provide a protective coating tenaciously bonded to the substrate. The composition has a corrosion inhibiting powdered metal, a black pigment of manganese dioxide and a primary bonding titanate polymer which when heated, undergoes a hydrolysis reaction producing an inorganic titanium dioxide bonding of the coating to the substrate. Improved film integrity and adhesion of the wet coating prior to the hydrolysis reaction is provided by a secondary organic resin. Preferably the coating composition also has thixotropic, metal suspension and hygroscopic agents. All the constituents are dispersed in a vehicle of active and inactive solvents.
Claims20
A black colored corrosion resistant coating composition for application to and curing on a metal substrate when raised to an elevated temperature, comprising:
- finely divided metal of the group consisting essentially of zinc, magnesium, aluminum, stainless steel, and alloys and blends thereof;
- said finely divided metal having an average particle size not greater than about 100 microns;
- a quantity of manganese dioxide equal to about 30% to 100% by weight of said finely divided metal;
- a quantity of a primary bonding material of a titanate polymer equal to about 9% to 47% by weight of said finely divided metal;
- and a vehicle of active and inactive organic solvents compatable with said titanate polymer and of sufficient quantity for the coating composition to have a viscosity in a Zahn No. 2 cup of about 20 to 150 seconds.
A method of coloring a metal substrate black and protecting the substrate from corrosion, comprising:
- applying to at least a portion of a surface of the substrate a thin and wet film of a liquid composition comprising finely divided metal of the group consisting essentially of zinc, magnesium, aluminum, stainless steel, and alloys and blends thereof;
- said finely divided metal having an average particle size not greater than about 100 microns;
- a quantity of manganese dioxide equal to about 30% to 100% by weight of said finely divided metal;
- a quantity of a primary bonding material of a titanate polymer equal to about 9% to 47% by weight of said finely divided metal;
- said titanate polymer comprises at least one of the alkyl esters of tetraisopropyl titanate, tetrabutyl titanate, 2-ethylhexyl titanate and N-butyl titanate;
- a quantity of a secondary resin equal to about 0.7% to 23% by weight of said finely divided metal, said secondary resin comprising at least one of cellulose, polyester, medium WPE resins, silicones, epoxy in the presence of caprlactom pyrrolidone and piperidone, conjugated drying oils, unsaturated carboxylic amides and aromatic asphalt resins;
- and a vehicle of active and inactive solvents compatable with said titanate polymer and of sufficient quantity for the coating composition to have a viscosity in a Zahn No. 2 cup of about 20 to 150 seconds;
- and heating the thin wet film to an elevated temperature for a sufficient period of time to evaporate the solvents and at least initiate curing of said primary bonding material to tenaciously adhere the dry film to the substrate as a coating coloring and protecting the substrate without heating any portion of the substrate to a temperature greater than 450.degree. F.
A method of making a black colored corrosion resistant liquid composition comprising:
- mixing together finely divided metal of the group consisting essentially of zinc, magnesium, aluminum, stainless steel, and alloys and blends thereof;
- said finely divided metal having an average particle size not greater than about 100 microns;
- a quantity of manganese dioxide equal to about 30% to 100% by weight of said finely divided metal;
- a quantity of a primary bonding material of a titanate polymer equal to about 9% to 47% by weight of said finely divided metal;
- said titanate polymer comprises at least one of the alkyl esters of tetraisopropyl titanate, tetrabutyl titanate, 2-ethylhexyl titanate and N-butyl titanate;
- a quantity of a secondary resin equal to about 0.7% to 23% by weight of said finely divided metal, said secondary resin comprising at least one of cellulose, polyester, medium WPE resins, silicones, epoxy in the presence of caprolactam pyrrolidone and piperidone, conjugated drying oils, unsaturated carboxylic amides and aromatic asphalt resins;
- and a vehicle of active and inactive solvents compatable with said titanate polymer and said secondary resin and of sufficient quantity for the coating composition to have a viscosity in a Zahn No. 2 cup of about 20 to 150 seconds;
- while mixing maintaining the temperature of said mixture at less than about 140.degree. F.;
- and after mixing milling said mixture to produce a homogeneous composition having a Hegman grind rating in the range of about 4 to 7.
Dependencies are inferred from the claim text.