Alodizing is a method of corrosion protection by the formation of a hard, airtight oxide coating on the surface of aluminium alloy parts by chemical means.
选项：

A:

The oxide coating on the surface of aluminium alloy parts can be formed by physical means.

B:

The oxide coating on the surface of aluminium alloy parts acts the function of corrosion protection.

C:

The aluminium alloy can protect the oxide coating from corrosion.（protect……from 保护……免受……）