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Letter 18012
Many spots in electro polishing process
before anodizing
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We have a great difficulty in anodizing process.
1: many spot on the surface when electro polishing (major
problems).
2: Rainbow after anodizing, even for longer times.
3: Losing brightness when anodizing.
This are some problem we have for long times. The sheets we are using
(1070 - 99.7%). Our reflectors are done by spinning. Before
anodizing, we hand polish it in soft wheel with green wax. We use
alloy or titanium hooks to hang the reflectors, then in the elector
polish. We dip in the solution for 30sec to wash the wax, and then
hook on electro. That helps less spots but doesn't stop it.
Many thanks for your reply
Joe Lee
- ZongShan, GungZou, China
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Agitation is very important.
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Ted Mooney, P.E.
finishing.com
Brick, New Jersey
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You need to go back to the basics of anodizing. Imporper settings
of anodizing bath parameters can cause the kinds of problems you
mentioned. Agitation is also a must.
S. Y. Yuen
- Hong Kong, China
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