Methods and electrolyte compositions for electrodepositing chromium coatings
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United States of America Patent
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May 16, 1995
Grant Date -
N/A
app pub date -
Aug 18, 1993
filing date -
Aug 18, 1993
priority date (Note) -
Expired
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Abstract
Methods for electrodepositing a chromium coating on a substrate comprisingmmersing the substrate in an aqueous electrolyte, and passing a sufficient current through the electrolyte to effect deposition of a chromium coating on the substrate. The aqueous electrolytes comprise from about 0.2 to about 0.6 mol/l of trivalent chromium ions, greater than about 1.4 mol/l of an amidosulfonic acid or a salt thereof, ammonium ions, formic acid or a salt thereof, and water.
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