Question

The factors that promote electro chemical corrosion are _____________.

• A. the nature of the impurity metal with which the metal under consideration is associated.
• B. the concentration of $O_2$ in contact with the surface of the metal.
• C. highly conducting solutions.
• D. all the above.

Answer 1

Answer: (D)

all the above.

Pure metals are resistive to corrosion. If there are impurities in a metal, a local galvanic cell is created with the metal as an anode and the impurity as a cathode. The result is the corrosion of the metal. And in the presence of a high concentration of oxygen, corrosion will be faster. Also when the conductivity of solutions is higher, the corrosion will be faster.

Hence, option D is correct.