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Holes in Hard Anodize

I do hard anodize with internal anodes on tubes. I sometimes get bubbles which demage the tubes by making tiny holes and this is a reason for rejection. Can anybody gives me a solution. The solution is 230ml/l sulfuric acid(technical) 11g/l oxalic acid. Temperature 0 degrees C. Vigorous air circulating.

Moshe Yaakov
- Lod Israel
2001

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