Non-cyanide electrode cleaning process

Details Non-cyanide electrode cleaning process Non-cyanide electrode cleaning process

1989-11-27

1990-11-06

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204146, C25F 100, C25F 500

Patent

active

049683977

ABSTRACT:
An electrolytic process employing a water solution of metal lactates or lactic acid and metal hydroxides, rapidly and safely removes metal plating bleed, residual oxides or the like (stains), plastic flash, resin bleed and deflashing media, from electrodes of electronic devices. Anodic etching or a combination of cathodic and anodic etching is preferred. Noble metals are selectively removed without cyanide compounds. For example, excess silver from spot plating on copper leadframes is etched away 2-3 times faster than the underlying copper. After cleaning the device leads are bright, polished, stain-free and without scale, residual plating bleed, deflashing media, plastic flash or resin bleed. The process is effective, less hazardous, easy to use and economical.

REFERENCES:
patent: 3912603 (1975-10-01), Mietens

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