Class 2 (2nd Engineer) MEKG 📅 Jan 2025

Exam Question

(a) Explain electro chemical reactions and the difference between oxidation and reduction electrochemical reactions with examples. Which reactions occurs at the anode and cathode? (8)

(b) Explain galvanic corrosion and discuss the different procedures to prevent it. (8)

Reference Answer

### Part (a): Electrochemical Reactions
#### 1. Definition of Electrochemical Reactions
An electrochemical reaction is a chemical process that involves the transfer of electrons between two substances, resulting in the generation or consumption of electrical energy. These reactions are fundamental to processes such as corrosion, battery operation, and electroplating. In the marine environment, they are the primary driving force behind the corrosion of a ship's hull and machinery components when exposed to an electrolyte like seawater.
An electrochemical reaction requires four key components to form a 'cell':

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