Cavitation corrosion studies were conducted on two duplex stainless steel (DSS) specimens of which one was containing tungsten and more molybdenum than the other. Experiments were conducted in seawater using an ultrasonically-induced cavitation facilities. The rate of mass-loss, free corrosion potential, and microscopic examinations were compared for the two alloys in the presence and absence of cavitation. There was negligible mass loss for the two alloys under stagnant conditions. However, some differences were observed between the two alloys with respect to mass-loss, corrosion potential and morphology of attacked areas. The alloy containing tungsten and mover molybdenum experienced more loss in weight regardless of their more noble corrosion potential during cavitation. This difference in behavior was explained in terms of the effect of the alloying elements on the microstructure of the alloys and their susceptibility to absorb the impact energy of cavitation.

Subject
Noble potential, Cavitation, Test methods, Materials, Corrosion resistant alloys, Microstructure, Mass loss, Molybdenum alloys, Free corrosion potential, Seawater, Corrosion resistance, Ferrite, Alloys
Keywords:
cavitation, duplex stainless steel, seawater, mass-loss, surface morphology
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1998
Association for Materials Protection and Performance (AMPP)
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