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08228 The Effect of Ultrasonically Induced Cavitation Conditions on the Behavior of Copper and Cobalt-Based Alloys in Seawater

Picture for 08228 The Effect of Ultrasonically Induced Cavitation Conditions on the Behavior of Copper and Cobal
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Product Number: 51300-08228-SG
ISBN: 08228 2008 CP
Author: Hameed Al-Hahsem
Publication Date: 2008
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A cavitation facility was used to study the cavitation corrosion behavior of carbon steel (UNS G10200), Cu-Ni 70-30 (UNS C96400), and cobalt-based alloy (UNS R30006) 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 250C. Cavitation conditions caused a noble shift in the free corrosion potential for carbon steel and an active one for Cu-Ni 70-30 and cobalt-based 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.
A cavitation facility was used to study the cavitation corrosion behavior of carbon steel (UNS G10200), Cu-Ni 70-30 (UNS C96400), and cobalt-based alloy (UNS R30006) 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 250C. Cavitation conditions caused a noble shift in the free corrosion potential for carbon steel and an active one for Cu-Ni 70-30 and cobalt-based 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.
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