Method for cleaning and passivating a metal surface

Details Method for cleaning and passivating a metal surface Method for cleaning and passivating a metal surface

1974-06-03

1976-05-18

Bashore, S. Leon

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 28, 134 40, 134 41, C23G 102

Patent

active

039575292

ABSTRACT:
A cleaning solvent useful in the cleaning of metal surfaces, e.g. nickle-iron alloys, contains sulfamic acid, citric acid, a solvent for hydrocarbon residues, and a surfactant. Metal surfaces are cleaned by contacting the surface with the cleaning solvent and then passivated by contact with aqueous solutions of citric acid or sodium nitrite or a combination of the two.

REFERENCES:
patent: 2994664 (1961-08-01), Wachter
patent: 3114657 (1963-12-01), Stilwell
patent: 3162547 (1964-12-01), Kendall
patent: 3239467 (1966-03-01), Lipinski
patent: 3330769 (1967-07-01), Golben et al.
patent: 3522093 (1970-07-01), Woolman

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