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Protecting 6061 aluminum from harsh chemicals

We are manufacturing a motor for the food industry. Part of the motor is made from 6061 extruded aluminum. We need a coating to protect the aluminum from harsh cleaning agents ranging in pH from 1 to 12. Part of our manufacturing process involves heating the aluminum part to 700 degrees F, so any coating will have to withstand this temperature. The coating must also have FDA approval. We have used a white, 2-part epoxy coating in the past, but it is brittle and susceptible to chipping which exposes the aluminum substrate.

Any suggestions would be greatly appreciated.

David Hansen
- Racine, Wisconsin
2004

In a perfect world electroless nickel plating will work . In the real world your motor housings will get nicks and dings exposing the aluminum and get attacked by some of the more harsh cleaners. Until your customers identify and use cleaners compatible with aluminum all you can do is sit back and watch your spare parts sales soar.

Todd Osmolski
- Charlotte, North Carolina, USA
2004