Metal treating compositions of adjusted pH

Details Metal treating compositions of adjusted pH Metal treating compositions of adjusted pH

1975-04-10

1976-11-09

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 616, 106 14, C23F 726

Patent

active

039909204

ABSTRACT:
Metal treating compositions, containing chromic acid and pulverulent zinc, and which find particular utility in the coating of metal substrates prior to painting, now exhibit extended bath stability through pH adjustment. The key to the adjustment is not in the final bath makeup. Rather, the adjustment is made during preparation of a precursor component containing chromic acid. Such component of adjusted pH may then be blended with additional composition ingredients including the pulverulent zinc to form a bath of excellent stability, e.g., extended freedom from gelation.

REFERENCES:
patent: 3553034 (1971-01-01), Harvey et al.
patent: 3671331 (1972-06-01), Malken et al.
patent: 3687738 (1972-08-01), Malken
patent: 3687739 (1972-08-01), Kennedy et al.
patent: 3849141 (1974-11-01), Palm et al.

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