Exam Question
With reference to hull protection against corrosion and fouling, write a brief explanation of each of the following:
(a) Sacrificial anodes (6)
(b) Impressed Current system (6)
(e) Means of preventing marine growth and fouling (4)
Class 4 (4th Engineer)
SC&S
📅 May 2024
Reference Answer
### (a) Sacrificial Anodes (6 Marks)
#### 1. Principle of Operation
Sacrificial anode protection is a form of cathodic protection based on the principles of a galvanic cell. When two dissimilar metals are electrically connected in an electrolyte (seawater), the more electrochemically active metal (the anode) will corrode preferentially, while the less active metal (the cathode) is protected.
#### 2. Application and Mechanism
#### 1. Principle of Operation
Sacrificial anode protection is a form of cathodic protection based on the principles of a galvanic cell. When two dissimilar metals are electrically connected in an electrolyte (seawater), the more electrochemically active metal (the anode) will corrode preferentially, while the less active metal (the cathode) is protected.
#### 2. Application and Mechanism
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