Experimental apparatus development and mechanism analysis of multiform combined wears in ships under ocean operating conditions

Abstract

Based on the operational environment of ships in the ocean, an experimental apparatus of the combined wear for slurry erosion, cavitation erosion, and electrochemical corrosion is designed and manufactured. The apparatus has two specimen zones, and it can simultaneously conduct several specimen tests for slurry erosion, cavitation erosion with or without the application of electrochemical corrosion. The impact speed, impact angle, environmental pressure, and other parameters are adjustable. The tests of three materials Q235, DH32, and NM360 steels are completed. The results show the wear is mainly slurry erosion and cavitation erosion for ductile materials of low strength and low hardness, and it is mainly corrosion for ductile materials of high strength and high hardness. Corrosion causes more damage to materials than slurry erosion and cavitation erosion. The wear degree of materials increases with the increase of the fluid impact speed.