The surface of aluminum parts, even if you wipe again many times, after a long time, wipe again with a dust-free cloth, the dust-free cloth will still turn black, this is what happened?

Aluminum is a very active metal, but it forms an oxide layer on the surface, which protects it from further oxidation. You're removing the oxide layer, and it's going to continue to oxidize. So there's no need to erase. Or we can do electrophoresis.

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