|Discoloration of Aluminum|
Posted by: Dave Noseworthy |
We submerge our 5052 H34 aluminum boats in our water filled testing tank, in as little as 24 hours the part of the aluminum that is under water is changing color, becoming a much darker, browner, dark grey color. The color change of the aluminum can be removed with a polish, so it is not penetrating to a great degree. We had emptied the tank at the beginning of January, and I had partly submerged some samples in the new water for various lengths of time, with no major color change. Periodically since then, I have submerged aluminum samples, with the color change becoming more and more apparent the longer the water is in the tank. The water has been in the tank for 2 months now, and boats exiting the tank after being submerged for only 24 hours are in terrible condition. We use treated city water in our test tank, and I have test reports on the water supply, nothing seeming unusual. What should I do next?
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