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What is Cathodic Protection
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Galvanic Protection
Which do Ships Use?
Ships mainly use ICCP to protect their hull. The reason is that protection remains constant no matter the water's resistivity. Which leads to a smoother hull since it is better protected, cheaper maintenance costs as well as the integrity of the hull being greater.
Galvanic Protection also known as Sacrificial Protection is a Cathodic Protection technique to control the corrosion of metal when using a Galvanic Anode (usually Magnesium, Aluminum, or Zinc). In order for galvanic cathodic protection to work, the anode must possess a lower (that is, more negative) electrode potential than that of the cathode (the target structure to be protected).
What is Cathodic Protection
Cathodic Protection and How it is Used on the Hulls of Ships
Cathodic Protection is a means to stop the corrosion of a metal's surface by making it the Cathode of an Electrochemical Cell. There are two types of Cathodic Protection, Galvanic Protection and Impressed Current Cathodic Protection.
Why It is Important for Ships
Cathodic Protection is very important for any ship. Without it ship hulls would rust almost immediately. However both Galvanic Protection and ICCP have different benefits and draw backs.
Impressed Current Cathodic Protection
Galvanic Protection Pros and Cons
Impressed Current Cathodic Protection
Pros and Cons
Impressed Current Cathodic Protection is used on larger structure or where electrolysis is high and Galvanic Anodes cannot deliver enough current to provide protection.
Galvanic Protection has the benefit of being relatively simple so there is less to go wrong. However there is one major draw back after a while the Galvanic Protection will run out and need to be reapplied as well as the fact that increases in the seawater resistivity can cause a decrease in the anode output and a decrease in the amount of protection provided.
ICCP has the benefits of not having to be reapplied, being able to be used when electrolysis is high as well as offering a constant amount of protection. However these benefits come at the cost of being more complex meaning more is able to go wrong.