Class 4 (4th Engineer) SC&S 📅 Aug 2023

Exam Question

With reference to corrosion processes:

(a) Explain the mechanism of:

(i) Stress corrosion (4)

(ii) Corrosion fatigue (4)

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

(i) Fretting corrosion (4)

(ii) Galvanic corrosion (4)

Reference Answer

### (a) Explanation of Corrosion Mechanisms
#### (i) Stress Corrosion Cracking (SCC)
Stress Corrosion Cracking is a failure mechanism resulting from the synergistic action of a static tensile stress and a specific corrosive environment on a susceptible material. Failure can occur at stress levels well below the material's nominal tensile strength.
**Mechanism:**

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