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

Exam Question

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;

Reference Answer

### (a) Mechanism of Corrosion Processes (8 Marks)
#### (i) Stress Corrosion Cracking (SCC)
Stress Corrosion Cracking is a catastrophic form of localized corrosion that results in the failure of metallic components under the combined action of a sustained tensile stress and a specific corrosive environment. Neither the stress nor the environment alone would cause this type of failure.
**Mechanism:**

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