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Letter 2015
Is anodizing or chromate conversion coating
better under powder coating
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I am trying to find answers to the following questions:
- Is the adhesion of powder coatings on aluminum improved by
anodize or alodine treatment before coating?
- If there is an improvement, is there a significant difference
between the two treatments?
I also would like to know, in simple terms, what the difference is
between anodize and alodine.
Can any of your readers help?
Marshall Davidson
- Meriden CT
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Alodine is a brand name for a process which is generically called
chromate conversion coating. These coatings are electrically
conductive and corrosion resistant but with almost no abrasion
resistance.
Anodize is an electrochemical process which converts the surface
aluminum into aluminum oxide. It is non-conductive with significant
corrosion and abrasion resistance.
Both coatings are widely used as adhesion promoters. However, some
post treatments can cause adhesion problems. Make sure your finisher
knows the final application. Generally, chromate conversion coatings
are less expensive than anodize, while anodizing offers better
protection.
July 13, 2009
what is the different between aluminum anodized and alumimum
powder coated
hosam m
guest - k.s.a.
July 13, 2009
Hi, Hosam. Anodizing has been described; if the description leaves
you with any questions, please let us know.
Powder coating is very similar to painting in final results and
appearance. Rather than the solids of the paint being dissolved into
water or solvent, the solids are supplied as a powder. The powder
particles are sprayed onto the part, and electrostatic attraction
keeps them there. Then the part goes into an oven where the powder
melts and fuses into a continuous thin sheet.
Regards,
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Ted Mooney, P.E.
finishing.com
Brick, New Jersey
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