Dark colored chromium based electrodeposits
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United States of America Patent
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Sep 25, 2012
Grant Date -
May 10, 2012
app pub date -
Nov 5, 2010
filing date -
Nov 5, 2010
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Abstract
An aqueous acidic trivalent chromium electrolyte comprising trivalent chromium ions and a complexing agent for maintaining the trivalent chromium ions in solution is provided in which the aqueous electrolyte comprises additives capable of producing a coating on a substrate having a desired dark hue. The additives typically comprise a dispersion of colloidal silica and an additional additive selected from thiocyanate ions and/or iron ions. The electrolyte is used in a method of producing the desired dark-hued decorative chromium coating on a substrate by electrodeposition.
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