Investigation on Ultrasonic Cavitation Erosion of Aluminum–Titanium Alloys in Sodium Chloride Solution

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.

Cavitation Erosion of the Austenitic Manganese Layers Deposited by Pulsed Current Electric Arc Welding on Duplex Stainless Steel Substrates

“…It involves the formation and development of voids (cavitational bubbles) in regions with pressures below a critical value (the saturation vapor pressure), which subsequently implode or burst when they reach areas of high pressure [1][2][3]. These bubbles contain the vapor phase of the liquid with or without dissolved gas.…”

Effects of cavitation erosion-induced surface damage on the corrosion behaviour of TA31 Ti alloy

“…Furthermore, in NaCl solution, the CE process of Ti alloys is affected by the synergistic effect of mechanical impact damage and corrosion, causing additional material damage. Zhao et al analysed the synergistic effects of CE and corrosion of two Al-Ti alloys in 3.5 wt% NaCl solutions and discovered that the effect of corrosion promoting CE was greater than that of CE promoting corrosion [11] . However, Ti alloys exhibit considerably high resistance to chloride ion attack in seawater solutions, mainly to pitting corrosion.…”