Blackening treatment solution for black Cr—Co alloy plating film
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United States of America Patent
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Mar 20, 2018
Grant Date -
Apr 2, 2015
app pub date -
Apr 18, 2013
filing date -
May 9, 2012
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Abstract
The present invention provides a blackening treatment method for a black Cr—Co alloy plating film, the method comprising bringing a black Cr—Co alloy plating film having a Cr content of 1 to 15 wt. % into contact with a blackening treatment solution comprising an aqueous solution with a pH value of −1 to 5. According to the present invention, the blackish color of a less blackish plating film formed from a plating bath containing trivalent chromium is enhanced to further improve decorativeness. Furthermore, the corrosion resistance of the film can be more improved by performing electrolytic chromate treatment after blackening treatment.
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