Water based coating for roughened metal surfaces
First Claim
1. A manufacture comprising a ferrous metal workpiece having a surface prepared by oxynitriding nitrocarburizing plus oxidizing, metallurgical process to provide an expanded porous surface, and coated with a composition comprising in combination:
2 Assignments
0 Petitions
Accused Products
Abstract
Calcium or other sulfonate gel in an oil carrier (such as that of U.S. Pat. No. 4,629,753 to Quinn), optionally mixed with a small amount of sodium sulfonate and tall oil fatty acids, can be neutralized with amine, e.g. DMEA, to form a soap which can be dispersed in water. Adding an acrylic emulsion results in an acrylic coating rich in corrosion-retarding alkali metal or alkaline earth metla sulfonates. This finish on metallurgically roughened, e.g. nitrocarburized, metal forms a firm film which can resist greater than 500 hours ASTM B117 salt spray.
9 Citations
4 Claims
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1. A manufacture comprising a ferrous metal workpiece having a surface prepared by oxynitriding nitrocarburizing plus oxidizing, metallurgical process to provide an expanded porous surface, and coated with a composition comprising in combination:
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2. colloidal metal-bearing organic/inorganic non-Newtonian complex having a total base number in the range of from about 80 to about 400 and comprising solid metal-containing colloidal particles, liquid dispersing agent and an organic molecule containing a hydrophobic portion and a polar substituent;
2. acrylic film-forming organic polymer. - View Dependent Claims (4)
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3. A manufacture comprising a metal workpiece having a surface prepared by, oxynitriding, nitrocarburizing or nitrocarburizing plus oxidizing metallurgical process to provide an expanded porous surface, and coated with a composition comprising in combination:
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1. non-Newtonian colloidal complex; 2. fatty acid having acid range of from about 80 to 250; 3. alkali-substituted amine; 4. alkali metal sulfonate or alkaline earth metal sulfonate; and 5. acrylic emulsion.
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Specification