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Austenitic stainless steels are providing excellent troublefree service in seawater for pumps, propellers, valves, and other items of marine equipment. A failure occurs occasionally as the result of deep localized pitting in a crevice. Data are given showing that austenitic, ferritic and martensitic stainless steel suffer pitting in crevices and under deposits in quiescent seawater. Austenitic stainless steels remain free from attack in high velocity seawater. Low purity ferritic and the martensitic stainless steels frequently pit in high velocity seawater. Crevice corrosion can be effectively controlled with cathodic protection from iron, zinc, aluminum or magnesium galvanic anodes or impressed current cathodic protection by polarization to -0.6 volts versus Calomel. Austenitic stainless steel, in many situations, performs well because it is a component of a multialloy assembly utilizing iron or steel. Gives examples from field experience.

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