Processing solution for forming hexavalent chromium free, black conversion film on zinc or zinc alloy plating layers, and method for forming hexavalent chromium free, black conversion film on zinc or zinc alloy plating layers
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United States of America Patent
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Jun 16, 2015
Grant Date -
Jul 16, 2009
app pub date -
Mar 10, 2009
filing date -
Mar 14, 2002
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Abstract
It is an object of the present invention to provide a processing solution used for forming a hexavalent chromium free, black conversion film, which is applied onto the surface of zinc or zinc alloy plating layers, and which has corrosion resistance identical to or higher than that achieved by the conventional hexavalent chromium-containing conversion film.
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