Aluminum oxide is a hard, high-resistance film that forms immediately on the surface of aluminum exposed to air. This tough film gives aluminum its good corrosion resistance. After a few hours, the oxide film formed is too thick to permit a low-resistance contact with cleaning. The film is so transparent that the bright and clean appearance of an aluminum conductor is no assurance of a good contact.
After cleaning the oxide film from aluminum, a compound must immediately be applied to prevent the oxide from reforming.
After cleaning the oxide film from aluminum, a compound must immediately be applied to prevent the oxide from reforming.
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