| http://www.w3.org/ns/prov#value | - th an alkali metal silicate aqueous solution is not particularly limited, and taken up for example are a method for allowing an aluminum plate to pass through a bath containing the above aqueous solution, a method for allowing an aluminum plate to be immersed in a bath containing the above aqueous solution, and a method for spraying the above aqueous solution over the surface of an aluminum plate.
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