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RESEARCH PAPERS

Cavitation Erosion of Cobalt Alloy Coatings Containing Tungsten Carbide Particles in Hydrochloric and Sulphuric Corrosive Media

[+] Author and Article Information
Wei Jun, Wang Fu-Xing, Cheng Yin-Qian, Chen Nan-Ping

Department of Mechanical Engineering, National Tribology Laboratory, Tsinghua University, Beijing, 100084, People’s Republic of China

J. Tribol 115(2), 285-288 (Apr 01, 1993) (4 pages) doi:10.1115/1.2921003 History: Received February 05, 1991; Revised June 01, 1992; Online June 05, 2008

Abstract

Cavitation erosion tests of composite coatings based on vacuum fusion sintered cobalt alloy containing tungsten carbide particles were carried out in 30 percent HCl and 50 percent H2 SO4 solutions. The technique used included an ultrasonic vibratory apparatus at 30°C, 25μm amplitude and 30 kHz frequency. Weight loss was measured with an analytical balance and the microstructure was observed with SEM. The test results showed that the cavitation erosion resistance of the composite coatings was increased by increasing the tungsten carbide content. The cavitation erosion is mainly caused by removal of the matrix material. The steady-state erosion rates have a linear relationship with the volume fraction of the tungsten carbide phase.

Copyright © 1993 by The American Society of Mechanical Engineers
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