Abstract
The electrochemical behaviour of austenitic stainless steels containing molybdenum in sea water has been studied up to 90°C. Pitting potentials have been determined by a special technique which eliminates the influence of the edges of the samples and crevice corrosion during the test. The kinetics and mechanisms of cathodic reduction of oxygen and of ferric ions on stainless steels are quite different; the FeCl 3 pitting test is therefore not suitable for assessing the relative performance of stainless steels in sea water. The very high resistance of 18 Cr-18 Ni-6 Mo-3 Cu has been demonstrated, as well as the performance of 18 Cr-10 Ni-2,5 Mo (Ti) up to temperatures higher than usually recommended. Galvanic corrosion between stainless steels and Cu alloys is briefly discussed.
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