Question

___________ corrosion takes place at or near the room temperature when the metal comes into contact with moisture or with aqueous solutions of salt, acids or bases.

(a) Direct corrosion

(b) Dry corrosion

(c) Galvanic corrosion

(d) Electrochemical corrosion

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This is a very interesting question from Cement Concrete Construction topic in chapter Cement Concrete Construction of Construction & Building Materials

Answer 1

The correct option is (d) Electrochemical corrosion

To explain: Electrolytic theory or Electrochemical corrosion is the commonly accepted theory of corrosion. For electrochemical corrosion to occur, conditions that should be satisfied are- there should be an electrolyte; the current should be passed through the circuit and the circuit must be closed.