Metal treating compositions of controlled pH

Details Metal treating compositions of controlled pH Metal treating compositions of controlled pH

1974-09-09

1976-05-04

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 616, 106 1, C23F 726

Patent

active

039545105

ABSTRACT:
Metal treating compositions, containing hexavalent-chromium-providing substance and pulverulent zinc, and which find particular utility in the coating of metal substrates prior to painting, now exhibit extended bath stability through pH control. The key to the control is achieved during preparation of precursor components. Such components of controlled, or adjusted, pH are then blended together 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), Malkin et al.
patent: 3687738 (1972-08-01), Malkin
patent: 3687739 (1972-08-01), Kennedy et al.

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