is a process used to form a layer of on the surface of metals.

Anodizing

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Powder coating

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oxides

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hydrogen

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Solution

The correct options are
A Anodizing
C oxides
Anodizing is one of the methods used for preventing corrosion. During anodizing, the dilute acid is taken in an electrolytic cell and aluminium article is dipped in it as anode. On passing an electric current the hydrogen gas is released at cathode and oxygen gas is released at anode. A reaction of aluminium with oxygen occurs at anode and a protective layer of hydrated aluminium oxide is formed on the metal surface.

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