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TCP with color?

TCP with color?

TCP with color?

We are specifying the new TCP conversion coating for some alumium parts and we have always specified "gold" color to our CR(6) coatings.  I understand adding dyes to TCP makes it fail salt spray tests.  We don't need a lot of protection since the end product is used in laboratory conditions.  Will platers be adding color to TCP coatings if it is specified?

RE: TCP with color?

Not likely.  Not considered a good idea: http://www.finishing.com/398/39.shtml

If you are willing to spend enough money, better to bright-dip, anodize & dye gold.

Very few dyes are available for chromate conversion coatings.  Those used for chromated zinc (blue, green, red) should work for chromated aluminum, but it's doubtful that such a gold dye exists since there wasn't a need.  
Also, if you do specify gold dyed, your metal finisher may try an anodizing dye which may bleed & fade since cannot seal properly.  A tinted lacquer should work, but you'd have to mask off or post-clean any electrical contact areas.

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