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Old 10-03-06, 11:32 AM   #1
merlinextraligh
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aluminum corrosion

The crankset on my Paramount has spots on it that appear to be the Aluminum corroding. Any ideas on how to remove the spots? It's only a cosmetic problem, so any solution needs to end up not damaging the finish to the crank.

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Old 10-03-06, 12:04 PM   #2
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polish them with a mild car wax and non-abrasive chamios, rag, sponge, etc...
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Old 10-03-06, 02:16 PM   #3
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Ammonia gets aluminum corrosion off pretty well. Just make sure to use eye protection and have good ventilation.
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Old 10-03-06, 02:35 PM   #4
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The crank likely has a clearcoat or clear anodizing over it. Tough stuff, but hell to pay when it starts to go. The easier way is to pull the crank and use aircraft stripper and THEN set about polishing the crank.
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Old 10-03-06, 07:26 PM   #5
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Originally Posted by CastIron
The crank likely has a clearcoat or clear anodizing over it. Tough stuff, but hell to pay when it starts to go. The easier way is to pull the crank and use aircraft stripper and THEN set about polishing the crank.
Aircraft stripper removes anodizing?
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Old 10-03-06, 08:45 PM   #6
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Aircraft stripper removes anodizing?
No, but it will remove clearcoat (a paint product).

If it is bare aluminum, use "Mother's Mag and Aluminum Polish". It is sold at auto stores.
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Old 10-03-06, 09:26 PM   #7
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Just buy these -- http://tinyurl.com/poe5b

I'm pretty sure this will cure your crank anodizing issues.

But seriously, I'm wondering if sandblasting with walnut shells will remove the clear anodizing (if it is anodizing rather than a paint or lacquer coat), allowing you to use previously mentioned products. It may be a bit expensive though.
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Old 10-03-06, 09:46 PM   #8
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Anodizing is a process that converts the surface layer to aluminun oxide. Do not think of it as a removeable layer short off sanding/grinding and repolishing.
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