Process for removing copper and copper oxide deposits from surfa

Details Process for removing copper and copper oxide deposits from surfa Process for removing copper and copper oxide deposits from surfa

1989-08-25

1991-04-23

Davis, Curtis R.

Cleaning and liquid contact with solids

Processes

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

134 26, 134 36, 134 42, C03C 2300

Patent

active

050097148

ABSTRACT:
A process for removing elemental copper and copper oxide deposits from a metal surface without first removing iron containing deposits therefrom. The process comprises the step of contacting the surface with an aqueous cleaning solution comprising gaseous oxygen present in an amount sufficient to oxidize at least a substantial portion of the elemental copper deposits present on the surface to copper oxide deposits and sufficient amounts of ammonia and an inorganic ammonium salt to dissolve at least a substantial portion of the copper oxide deposits present on the surface.

REFERENCES:
patent: 3072502 (1963-01-01), Alfano
patent: 3248269 (1966-04-01), Bell
patent: 3438811 (1969-04-01), Harriman et al.
patent: 4443268 (1984-04-01), Cook
patent: 4586961 (1986-05-01), Bradley et al.
patent: 4666528 (1987-05-01), Arrington et al.

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