Electrochemical machining with avoidance of erosion
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United States of America Patent
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-
Mar 5, 1991
Grant Date -
N/A
app pub date -
Feb 13, 1989
filing date -
Feb 13, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Metal workpieces for electrochemical machining, particularly those comprising titanium and/or aluminum, are protected from pitting by the application of an adherent conductive and protective coating comprising a compound of at least one noble metal selected from the group consisting of ruthenium, rhodium, palladium, iridium and platinum. Said coating protects the workpiece and also catalyzes oxidation of halide and/or water in the electrolyte, which competes successfully with oxidative erosion in the vicinity of faults in the protective coating. Other anodic elements, including clamping fixtures and auxiliary anodes, may also be coated.
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