Corrosion protection of offshore structures
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Abstract
Corrosion of steel is caused by a difference in the electropotential of two areas on a steel surface and the presence of an electrolyte connecting the two areas. This electropotential imbalance is equalized through an electrochemical reaction which causes the dissolution of iron molecules into the electrolyte and the eventual loss of integrity of the steel member. Sea water is an excellent electrolyte and readily permits the occurrence of the electrochemical reaction. However, sea water also contains dissolved gases and solids which have a tendency to form protective films on the steel surface and hinder the electrochemical reaction. Wave action and marine organisms are additional factors of the ocean environment influencing corrosion and tend to accelerate the corrosion process. [...]