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topic 9552

Sulfuric Concentration


Would the anodizers out there please let me know if hardcoat anodizing in sulfuric acid at a concentration of 270-300 gr/l is a common practice, rarely used or never used.

Thank you in advance for your help.

Rick Richardson, MSF
Dayton, Ohio


That number sounds pretty high - although it would still work. Common sulfuric concentration for hardcoat anodize is 165 - 240 gr/l.

David A. Kraft
- Long Island City, New York


We were using a 25%/vol bath for a while in our hardcoat line. The problem was it dissolved the surface faster than it built up. Thus coating for size was impossible. We have much better luck keeping all of our baths under 20%/wt.

Peter Faxon
- Oxnard, California


We use 247 - 303 g/l with pulse rectification up to 80V and have no problems.

Martin Trigg-Hogarth
Martin Trigg-Hogarth
surface treatment shop - Stroud, Glos, England

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