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topic 3961

Problems in Powdercoating of Aluminum 6063


Problem: Powder coating 6063 anodized alum (webster 4-7) 2" x 1/2" x 40' long rail. 18 stanchions attached 1 1/4 dia x 1 1/2 long.

1. Please explain to me the correct process. I understand powder coating steel but not alum.

2. Please explain to me the correct steps for recoating rejected parts.

John Bruhn
tool company - Syracuse, Indiana

February 28, 2009

Hi, John. The biggest difference is in the pretreatment. While steel is phosphated, aluminum should ideally be chromate conversion coated (sometimes called Alodine or Iridite because these are two major trade names for the process.

The process usually includes caustic cleaning, etching, and desmutting in addition to the chromate conversion coating step per se.


Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

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