An ultrasonically induced cavitation facility was used to study the cavitation corrosion behavior of carbon steel (UNS G10200), Cu-Ni 90/10 (UNS C70600), and UNS N05500 in seawater. The work included measurements of free corrosion potentials, and mass loss in presence and absence of cavitation. The cavitation tests were made at a frequency of 20 KHz and at temperatures of 25°C. Cavitation conditions caused an active shift in the free corrosion potential of these alloys. Cavitation also increased the rate of mass loss of these alloys by several orders of magnitude with respect to stagnant conditions. Cavitation made the surface of these alloys very rough, exhibiting large cavity pits in the middle region of the attacked area as revealed by the scanning electron microscope (SEM). Mechanical factors were determined to be the leading cause of metal loss.

Subject
Pits, Scanning electron microscopy, Cavitation, Test methods, Materials, Metal surfaces, Mass loss, Micrography, Seawater, Corrosion attacks, Negative potentials, Carbon steel, Alloys
Keywords:
Cavitation, corrosion, carbon steel, copper, nickel seawater, Free corrosion-potential
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2006
Association for Materials Protection and Performance (AMPP)
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