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Letter 4034
Chrome & Chelates
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I would like to know if chelates are a residual product in the
chroming process?
Dave Beck
- Carthage, NY
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I suspect that the answer to your question is "No", Dave, but . .
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As discussed in e-mail, I think you would get far more useful
responses if you would spend a little more time formulating your
question, Mr. Beck. I don't know whether your concern is about
chelates affixed to the chrome plated part, or chelates in the rinse
wastewater, or chelates accumulating in the chrome plating tank. I
don't know whether the application is hard chrome plating or
decorative plating, or whether the solution you are talking about is
conventional chrome-sulfuric, or dual catalyst, or high efficiency
etch-free, or a proprietary thin dense chrome.
I don't know whether you mean to use 'chelate' in the strict sense
or in the more liberal sense (as many people do today) to refer to
any complexing agent. In a very broad interpretation of your
question, I might even imagine that you might be trying to
precipitate the chrome without first reducing it, and that you are
naturally being unsuccessful, and that you might really be asking why
you are having trouble.
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Ted Mooney, P.E.
finishing.com
Brick, New Jersey
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