Method for etching piston rings

Details Method for etching piston rings Method for etching piston rings

1988-06-22

1989-05-16

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041297, 20412975, 20412995, 204217, 204222, C25F 302

Patent

active

048307190

ABSTRACT:
A method for the etching of chromium-coated piston rings comprises the steps of producing relative movement and rubbing contact between the chromium-coated surface of a piston ring which is anodic and a cathode having a porous material on the rubbing surface thereof, supplying an electrolyte to the porous material between the anodic ring surface and the cathode, establishing an electrical potential therebetween and supplying an electrical current for a period of time during the relative movement.

REFERENCES:
patent: 2315798 (1943-04-01), Koether
patent: 4176434 (1979-12-01), Cromwell et al.
patent: 4214952 (1980-07-01), Sato et al.
patent: 4294673 (1981-10-01), Kimoto et al.

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