Question

Write any three factors which promote corrosion.​

Answer 1

Factors Affecting Corrosion

1. Exposure of the metals to air containing gases like CO2, SO2, SO3 etc.

2. Exposure of metals to moisture especially salt water (which increases the rate of corrosion).

3. Presence of impurities like salt (eg. NaCl).

4. Temperature: An increase in temperature increases corrosion.

5. Nature of the first layer of oxide formed: some oxides like Al2O3 forms an insoluble protecting layer which can prevent further corrosion. Others like rust easily crumble and expose the rest of the metal.

6. Presence of acid in the atmosphere: acids can easily accelerate the process of corrosion.

Answer 2

Answer:

There are several factors influencing the rate of corrosion including diffusion, temperature, conductivity, type of ions, pH value and electrochemical potential.

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