Coating composition and method

Details Coating composition and method Coating composition and method

1980-07-14

1982-07-06

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 615R, C23F 700, C23F 708

Patent

active

043381405

ABSTRACT:
An aqueous acidic composition provides improved corrosion resistance to a metal, e.g., ferrous, zinc or aluminum surface upon contact. The composition contains dissolved hafnium and/or zirconium, fluoride, preferably a vegetable tannin compound, and optionally phosphate ions.

REFERENCES:
patent: 1710743 (1929-04-01), Pacz
patent: 3160506 (1964-12-01), O'Connor et al.
patent: 3682713 (1972-08-01), Ries et al.
patent: 3912548 (1975-10-01), Faigen
patent: 3964936 (1976-06-01), Das
patent: 4017334 (1977-04-01), Matsushima et al.
patent: 4148670 (1979-04-01), Kelly
Hopkins, Chapters in the Chemistry of Less Familiar Elements, vol. II, Stipes Pub. (1939), pp. 5-7.
Imperial Metal Industries, Chem. Abs. 71:33000u (1969).

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