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The ____________ is the simplest corrosion produced by means of chemical attack.

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The ____________ is the simplest corrosion produced by means of chemical attack.

(a) Electrolytic theory

(b) Chemical action theory

(c) Galvanic action theory

(d) High temperature oxidation

This question was addressed to me during a job interview.

The doubt is from Cement Concrete Construction in division Cement Concrete Construction of Construction & Building Materials

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The correct option is (b) Chemical action theory

For explanation: Chemical action theory or Direct corrosion includes oxidation in which the oxygen of atmosphere combines with all or part of surface of a material. In this the combined action of oxygen, carbon dioxide and moisture on steel results in corrosion or rust.

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