Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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BLACK ANODIZE TURNS RED
WHY WOULD SHELLS MADE OF 6262 ALUMINUM THAT ARE BLACK ANODIZED TURN RED?
BILL HUMESCONNECTORS - LOMBARD, IL., U.S.
2000
Poor sealing! or Needs Inorganic dyeing as our process Ano-Med Anodizing for the Medical Industry ( Non-Fading )
Max Faeth- Los Angeles, California, USA
2000
I'll agree with Max on the part about poor sealing part. There are also other things that can cause this problem. Check the pH on your dye tank(s) make sure its within range, and also check the tank for chlorides in the dye. They are most notorious for causing pitting problems in a dye tank but in my opinion nothing can be ruled out until you actually rule it out.
Matthew Stiltner- Toledo, Ohio
2000
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