Abstract
Two kinds of Ti-alloys, i.e., Al–5Ti and Al–10Ti alloys, were manufactured in this study, and their ultrasonic cavitation erosion behaviors in 3.5 wt.% NaCl solution were evaluated by the cumulative mass loss, scanning electronic micrograph, and three-dimensional morphology. The results show that mass loss and surface damage of the Al, Al–5Ti, and Al–10Ti alloys obviously increased with the increasing cavitation erosion time. Compared with the pure Al, the cavitation resistance of the Al–5Ti and Al–10Ti alloys was improved because of the presence of the TiAl3 phase. In addition, the synergistic effect between cavitation and corrosion of the Al–Ti alloy in 3.5 wt.% NaCl solution was studied according to the polarization curve of the moving electrode. The mass loss caused by the synergistic effect between cavitation erosion and corrosion accounted for a large percentage, 23.59%, indicating that corrosion has a critical impact on the cavitation erosion of the Al–Ti alloys. Compared with corrosion promoted by cavitation erosion, the cavitation erosion promoted by corrosion had a larger promoting effect.
Highlights
Cavitation erosion refers to surface damage caused by cavitation in a hydrodynamic environment, which is a common damage form of flow handling propellers, such as turbines, propellers, hydraulic machines, and other flow parts [1,2,3,4,5]
Combined with the mass loss and roughness in each cavitation stage of the sample, the cavitation erosion and electrochemical corrosion behavior of the Al–Ti alloys in 3.5 wt.% NaCl solution were analyzed, which provides a better understanding for the damage mechanism of cavitation erosion
Loss3a shows the curves of the cumulative mass loss of the Al, Al–5Ti, and Al
Summary
Cavitation erosion refers to surface damage caused by cavitation in a hydrodynamic environment, which is a common damage form of flow handling propellers, such as turbines, propellers, hydraulic machines, and other flow parts [1,2,3,4,5]. Shock waves and microjets generated by bubble collapse impact the surface of the material in the form of stress pulses and destroy the passivation film on the surface of the material, which can accelerate the process of electrochemical corrosion. Several researchers have mainly studied the cavitation erosion resistance of titanium alloys, cobalt alloys, and bronze materials to solve the cavitation erosion problem [6,22]. The effect of the interaction between cavitation erosion and electrochemical corrosion on the cavitation corrosion resistance of aluminum alloys is rarely studied. Combined with the mass loss and roughness in each cavitation stage of the sample, the cavitation erosion and electrochemical corrosion behavior of the Al–Ti alloys in 3.5 wt.% NaCl solution were analyzed, which provides a better understanding for the damage mechanism of cavitation erosion
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