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research-article

Study of erosion-corrosion and corrosion behavior of CP-Ti during slurry erosion

[+] Author and Article Information
N. Khayatan

School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran 14399-57131, Iran
negar.khayatan@ut.ac.ir

Hamid M. Ghasemi

School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran 14399-57131, Iran
hghasemi@ut.ac.ir

M. Abedini

Department of Metallurgy and Materials Engineering, Faculty of Engineering, University of Kashan, Kashan 87317-53153, Iran
mabedini@kashanu.ac.ir

1Corresponding author.

ASME doi:10.1115/1.4040156 History: Received December 18, 2017; Revised April 23, 2018

Abstract

The erosion-corrosion and pure erosion of commercially pure titanium have been investigated in a 3.5% sodium chloride solution containing 10, 30, and 60 g/l SiO2 particles with an average size of 318 µm. The tests were performed at impact velocities of 4, 6 and 9 m/s under two impact angles of 40° and 90°. Polarization technique was used to study corrosion behavior of the material during erosion-corrosion. The eroded surfaces were examined by a scanning electron microscope and a surface profilometer. The pure erosion, corrosion, and erosion-corrosion rates increased as impact velocity and sand concentration increased. The corrosion rates of the eroding surfaces under a normal impact were lower than those at an impact angle of 40°. The S/T ratio, i.e., the ratio of synergy to erosion-corrosion rates was about 80% at an impact velocity of 4 m/s, which indicated the high effect of the electrochemical corrosion on the degradation of CP-Ti at low velocity. The S/T ratio decreased to 30% and 15% at the impact velocities of 6 and 9 m/s, respectively. The S/T ratio was also decreased with increasing sand concentration indicating a greater role of mechanical degradation upon the erosion-corrosion rate in the concentrated slurries.

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