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-----Anodising problems
I am working in anodising plant as supervisor.plant located at Chennai. we are using a 20% sulfuric acid at 20deg for anodising . we are having an Al alloy 5%Cu,12%Si. We are facing a problem in finish. FInished material having greenish in some area. I feel that cu is also oxidised. I thought alloy was etched during process. Another one is roughness. which is best method const current or voltage.
M.Ramasami- Chennai, INDIA
2006
What casting & cleaning processes?
This alloy (a bit more alloyed than 384) isn't expected to give a good anodized appearance. Avoid caustic etching -- use only as necessary to hide scratches, etc. Caustic preferentially attacks the aluminum, increasing the surface Si & Cu content. Use a fluoride-containing deox/desmut.
Constant anodizing current is preferable.
I've heard that burnishing can homogenize the surface to enable a good anodize appearance. Anyone know more about this?
- Goleta, California
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2006
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