Abstract
Linear polarization techniques have been applied to a corrosion system, plain carbon and low-alloy steels in sea water, featured by time-dependent phenomena. Polarization resistance measurements have been interpreted according to equivalent circuits representative of the steel surface behaviour in sea water, in order to avoid misleading contributions arising from the presence of solid corrosion products. Electrochemical data are in good agreement with weight loss measurements throughout four years of immersion in natural sea water and give information about the corrosion mechanisms, mainly based on the settling of localized macro-cathodic and anodic areas.
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