Class 1 (Chief Engineer)Engineering Management📅 Jan 2026
Exam Question
Corrosion is considered to pose a considerable danger to ships hulls, cargo and ballast tanks, discuss the following:
(a) Influence of temperature on the corrosion rate of cargo and water ballast tanks.
(b) Causes of coating deterioration in cargo and ballast tanks.
(c) Describe how an assessment of the coating condition helps to be aware of the tank corrosion status.
(d) State the information obtained from Coating Technical File.
Reference Answer
### (a) Influence of Temperature on Corrosion Rate The rate of corrosion in cargo and water ballast tanks is fundamentally governed by the principles of electrochemistry. Temperature is a critical factor that significantly accelerates this process. * **Electrochemical Kinetics**: Corrosion is an electrochemical reaction. According to the Arrhenius equation, the rate of most chemical reactions, including corrosion, approximately doubles for every 10°C increase in temperature. This is due to the increased kinetic energy of the reacting species. * **Mechanism of Acceleration**:
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