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Q1. With reference to corrosion processes

a) Explain the mechanism of: (8)

i) Stress corrosion.

ii) corrosion fatigue.

b) State where the following types of corrosion may occur, and the materials commonly involved in each case. (8)

i) Fretting corrosion

ii) Impingement corrosion

iii) Galvanic corrosion

iv) Crevice corrosion