Abstract
Low-Cu Al–Zn–Mg series 7046 alloys were prepared using ultrasonic vibration casting and conventional casting methods. The grain sizes, grain boundary precipitates, and precipitate-free zones of the alloys were studied, and the polarization curves and electrochemical impedance spectra were measured to reveal the effects of ultrasonic vibration on the alloy microstructure and corrosion properties. The results showed that ultrasonic vibration refines and homogenizes the microstructure, promotes the discontinuous distribution of grain boundary precipitates, and increases the precipitate-free zone width. Consequently, the corrosion resistance is enhanced, and the corrosion rate is decreased.
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