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neilca neilca is offline
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Join Date: Oct 1999
Location: Marietta, GA
Posts: 807
You probably cleaned this parts in a base solution (soap or sodium hydroxide) The aluminum looks "smutted" that is the gray/black look. To make this shine again you need to use an acid solution. There is a tri-acid solution used to desmut aluminum. Its a combination of Hydrachloric, Phosphoric, and another I cannot think of right now. Do a web search for Caswell Plating. The sell a de-smut solution. It should help you with the alumina deposits also.

Good luck,
Old 06-27-2005, 07:55 AM
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