Chromium-containing coating of enhanced corrosion resistance

Details Chromium-containing coating of enhanced corrosion resistance Chromium-containing coating of enhanced corrosion resistance

1977-04-21

1978-10-31

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 616, C23F 726

Patent

active

041232909

ABSTRACT:
A chromium-containing coating composition, also containing pulverulent metal, will provide a coating of excellent corrosion resistance when the composition contains urea as at least a part of the reducing agent, and when the composition also contains particular pH adjusting agent. The reducing agent of the composition is used in regard to the hexavalent chromium contained in the chromium portion of the composition. The pH adjusting agent should be a compound of zinc. In addition to achieving excellent corrosion resistance, resulting coatings can provide the other desirable characteristics for coated substrates, such as topcoat adhesion and formability, without deleterious effect.

REFERENCES:
patent: 2898250 (1959-08-01), Pimbley
patent: 3990920 (1976-11-01), De Ridder et al.

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