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Letter 14026
Red indicates corrosion site in hard
chrome deposit
I recently witnessed a test used on a Hard Chrome deposit, where a
clear solution was dabbed onto the deposit. The deposit was approx
1mil thick. If pores or potential corrosion sites existed, the
solution indicated this by turning red at the site. It sounds similar
to the ferroxyl test, but red not blue. Could the solution contain
phenolphthalein? I asked, but of course got no answer from the
tester. I would like to make some of this solution for my own use,
and I'm sure others would as well. Can anyone help?
Steve Delaney
- Beamsville, Ontario, Canada
Sounds a lot like a copper sulfate test, but that should have been
a light blue solution.
James Watts
- Navarre, Florida
I assume that the basis metal is steel. The solution could be
sodium or potassium thiocyanate. This will react with corrosion
products of iron (compounds in the ferric state) to give a deep red
color.
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Dave Wichern
- The Bronx, New York
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Dear Reader, please --
- Post a
question on a different subject.
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- Answer or follow-up on this subject (in non-commercial
fashion).
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