Letter 32088

Process on powdercoating alumium products  

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Dear Sir:

I have a question about powdercoat on Alumium. We have 1,000 pcs of alumium products ,for which we are going to powdercoat them matt black. However they were undertaking chemical reaction when phosphating. As major in steel and stainless steel,we are inexperienced in this field. Could you please give us a few suggestions?

Best Regards,

David Wei
metal fabrication - Xiamen, Fujian, China

Although it is possible to put zinc phosphate on aluminum, it is not possible to iron phosphate aluminum. You have not given us any details, so we have no idea whether there is a minor flaw in your sequence or you are attempting something that is hopeless from the start. It is probably better to chromate the aluminum than to phosphate it.

You need to either retain a consultant or to align yourself with a powder coating supplier and a pretreatment supplier who know what they are doing. Good luck.

Ted Mooney, P.E.  finishing.com Brick, New Jersey

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