Exam Question
Discuss new developments in Impressed Current Cathodic Protection (ICCP) employed for marine structures with specific reference to
(a) Computer controlled muiti-zone systems
(b) Fine grain ICCP.
Class 1 (Chief Engineer)
Engineering Management
📅 Nov 2022
Reference Answer
### Introduction to Impressed Current Cathodic Protection (ICCP)
Impressed Current Cathodic Protection (ICCP) is an active method used to prevent the corrosion of a ship's hull and its appendages. Unlike passive sacrificial anode systems, which rely on the natural potential difference between metals, an ICCP system uses an external DC power source to impress a current through inert anodes onto the hull. This forces the entire wetted surface of the hull to become the cathode in an electrochemical cell, thereby suppressing the natural corrosion process. The system continuously monitors the hull-to-seawater potential via reference electrodes and adjusts the current output to maintain this potential within a safe, non-corroding range (typically -800 to -850 mV relative to a Silver/Silver Chloride reference electrode).
Recent advancements have moved from simple, single-zone systems to highly sophisticated, computer-controlled adaptive systems, significantly improving protection efficiency and hull lifespan.
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Impressed Current Cathodic Protection (ICCP) is an active method used to prevent the corrosion of a ship's hull and its appendages. Unlike passive sacrificial anode systems, which rely on the natural potential difference between metals, an ICCP system uses an external DC power source to impress a current through inert anodes onto the hull. This forces the entire wetted surface of the hull to become the cathode in an electrochemical cell, thereby suppressing the natural corrosion process. The system continuously monitors the hull-to-seawater potential via reference electrodes and adjusts the current output to maintain this potential within a safe, non-corroding range (typically -800 to -850 mV relative to a Silver/Silver Chloride reference electrode).
Recent advancements have moved from simple, single-zone systems to highly sophisticated, computer-controlled adaptive systems, significantly improving protection efficiency and hull lifespan.
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