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Pitting in bright silver anodizing




2006

I am inquiring about bright silver anodizing on aluminum extrusions
We have had problems with bad pitting on the aluminum, we bring the metal in from china and have had that blamed but when we push the anodizer it gets done properly.
can you tell me why this happens.

Jeffrey James Stokes




2006

Suspect chloride contamination in the line. Look for it in the deox, anodizing solution, and seal. IF the parts are racked on titanium and the seal tank is stainless steel, the galvanic current aggravates pitting, then in the presence the chloride pitting will be worse.

robert probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
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