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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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BLACK ANODIZED PROBLEM

I HAVE A SET OF BLACK ANODIZED TRUCK BEDRAILS THAT ARE TURNING PURPLE IN COLOR,WHAT IS CAUSING THIS PROBLEM?

ALBERT PACHECO
- ACUSHNET, MASSACHUSETTS, USA
2003

Could be numerous things...poor sealing of the coating would be the #1 suspect. Inadequate coating thickness.... using a dye with poor lightfastness. Its almost impossible to tell without physically testing the rails.

Marc Green
anodizer - Boise, Idaho
2003

Is there a smut that rubs off when parts are dry? If so cut your anodize time by 15 min your parts may be burning in the anodize tank. This is also common on 2000 series substrates.

Casey Weizel, President
Foresight Finishing LLC

- Tempe, Arizona

2003

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