Method for etching piston rings
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United States of America Patent
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-
May 16, 1989
Grant Date -
N/A
app pub date -
Jun 22, 1988
filing date -
Jun 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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