Water based coating for roughened metal surfaces
AssigneeAshland Oil, Inc.
InventorsRoger E. Hayner, Stephen E. See
Life of this patent
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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.
Claims3
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:
- 1. 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.
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:
- 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.
Dependencies are inferred from the claim text.