Old 08-19-19, 11:41 AM
Wilfred Laurier
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I can't see the pictures. In general, though, aluminum corrosion is only a problem if there is some chemical or mechanical process removing the oxide layer. If it is left alone, the oxide layer is extremely thin but is actually a hard ceramic 'oxide' material that will prevent further corrosion. Each time the oxide layer rubs off it quickly forms another, taking away another thin layer of aluminum. This can be from something rubbing on the aluminum (or maybe a chain hitting it) or from some chemical process - another person mentioned chemical ice-melter - around here they put rock salt on the roads and it corrodes everything.

My advice would be to feel with your finger if there is noticeable pitting or other removal of material. If there is then I would scrap the frame - cut it up and put it in the recycling with aluminum cans. Replacement aluminum frames can be found very cheap on the internet.
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