Color control of trivalent chromium deposits
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United States of America Patent
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Sep 12, 2017
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app pub date -
Feb 16, 2012
filing date -
Feb 16, 2012
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Abstract
A method of adjusting and controlling the color of trivalent chromium deposits is provided. The method includes the steps of: (a) measuring the color of a trivalent chromium deposit standard; (b) adding one or more color enhancing additives to a trivalent chromium electrolyte; (c) contacting the substrate with the trivalent chromium electrolyte containing the one or more color enhancing additives to deposit trivalent chromium on the substrate; (d) measuring the color of the color-enhanced trivalent chromium deposit; (e) comparing the color of the color-enhanced chromium deposit to that of the standard; and (f) if necessary, adjusting the amount of the one or more color enhancing additives added to the trivalent chromium electrolyte if the color of the color-enhanced chromium deposit is outside of a desired optical variation from that of the standard color-enhanced chromium deposit. The color of the trivalent chromium deposit may be measured using a spectrophotometer.
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