Class 4 (4th Engineer) MEKG 📅 Dec 2024

Exam Question

(a) What is meant by the term 'corrosion' and how does it occur in nature? (6)

(b) Name different types of 'wet and dry corrosion' (at least 4 of them) with brief account of their occurrence and suitable preventive measures for their control. (10)

Reference Answer

### (a) Definition of 'Corrosion' and its Occurrence in Nature (6 Marks)
**Definition of Corrosion:**
Corrosion is the natural process of deterioration of a material, usually a metal, resulting from a chemical or electrochemical reaction with its surrounding environment. It represents the tendency of refined metals to revert to their more thermodynamically stable, natural states, such as oxides, sulfides, or carbonates, from which they were originally extracted.
Key principles are:

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