Discussion
Anodising of aluminium builds a protective film by making the metal the
Answer: B
Correct answer: anode in an acid electrolyte
Anodising makes the aluminium the anode, so oxygen liberated there oxidises the surface into a thick, hard, adherent film of aluminium oxide - far thicker than the natural film and porous enough to be dyed and then sealed. Sulphuric acid is the usual electrolyte. Making the metal the cathode would deposit something onto it rather than converting its own surface.
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