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Letter 22012
Powdercoating aged alodine
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I have conversion coated surfaces that I would like to powdercoat.
The conversion coating has been on for 6-12 months. Does this have to
be removed to get good adhesion to the aged surface? Will I still get
good corrosion protection?
AJ Nielsen
- Duluth, MN, USA
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Six months room temperature low humidity shelf life should not
matter provided you can remove the organic soils that may have
settled on the surface.
More important, especially with powder coat, is that the chromate
conversion coating be very thin. If the chromate is too thick the
coating will sheer and the paint peel right off. Also, if the coating
is thick, the high temperature of curing powder paint will crumble
the chromate and, again, the paint will peel.
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I have some parts that I want to powder coat in some areas and
alodine in others. I need the alodine for corrosion resistance and
conductivity and the powder coat for corrosion resistance and
aesthetics. How should I go about getting this combination? Can the
powder coating be subjected to the processes required for alodine
coating? If so, how does this affect the powder if at all? Also, if a
part is alodine coated, then powder coated, and the re alodined is
the second alodine coating as good as the first? What kind of
dimensional change could I expect from two coatings of alodine? Any
information will be much appreciated.
Thanks,
Brian Atchley
- Santa Rosa, CA, USA
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