Chromium-free surface treatment

Details Chromium-free surface treatment Chromium-free surface treatment

1980-02-14

1981-04-28

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 615Z, C23F 710, C23F 714

Patent

active

042643783

ABSTRACT:
A chromium-free process for phosphatizing a metal surface provides for applying to the surface an aqueous acidic solution having pH 1.5 to 3.0 and containing phosphate; a metal cation of valence two or greater; molybdate, tungstate, vanadate, niobate or tantalate ions; and drying the solution on the surface without rinsing.

REFERENCES:
patent: 2502441 (1950-04-01), Dodd
patent: 2854369 (1958-09-01), Kronstein
patent: 2975082 (1961-03-01), Henricks
patent: 3097118 (1963-07-01), Leonard
patent: 3450577 (1969-06-01), Beach
patent: 3562023 (1971-02-01), Courier
patent: 3586543 (1971-06-01), Iijima et al.
patent: 3697332 (1972-10-01), Kuehner
patent: 3819385 (1974-06-01), Schumichen et al.
patent: 4110127 (1978-08-01), Longuepee et al.

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