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Letter 15057
Problem with Painting / Finishing of Non
Ferrous Castings
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In the use of copper and aluminum based castings I often have a
variety of final finishes applied either air dried and/or heat cured.
Great care is taken to polish, clean, and pre-treat the castings
prior to the application of final finish however occasionally
corrosion will occur beneath the surface of the coating applied to
the copper based castings or the paint will pop off of the aluminum
casting. There is no specific order to this problem as one batch may
not have a problem while another batch may have the problem
widespread or sometimes with just a few pieces within a batch. The
problem can show up almost immediately or sometimes weeks later. I
have gotten a wide variety of feedback from various "informal"
sources on this problem indicating such causes as the release of
gases from the casting and/or the trapment and later release of
moisture, oils, polishing compounds, etc. I am trying to better
understand what the cause might be and am looking for suggestions /
solutions to this problem.
G Pagel
- Wausau, WI, US
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Hello,
If you are having outgassing problems, try heating the part prior
to painting.
Dear Reader, please --
- Post a
question on a different subject.
-
- Answer or follow-up on this subject (in non-commercial
fashion).
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