Abstract
AbstractUltrasonic rolling was carried out to improve the corrosion resistance of the turning surface of magnesium alloy. The effects of rolling process parameters on surface roughness were studied, and the relationship between surface integrity and electrochemical corrosion characteristics was analyzed. The results showed that the ultrasonic amplitude and rolling passes have great influence on the surface roughness, while the static pressure and feed rate have little influence on the surface roughness. The two-dimension surface roughness of ultrasonic rolling samples is reduced by at least 88.0%, compared with that of the turning sample. The surface grain of ultrasonic rolling sample with the smallest surface roughness is significantly refined, and the thickness of grain refinement layer reaches 200 μm. The difference of corrosion resistance between turning and ultrasonic rolling surfaces is revealed via the electrochemical impedance spectroscopy. The surface integrity and corrosion resistance of AZ31B magnesium alloy are significantly improved after ultrasonic rolling.KeywordsUltrasonic rollingMagnesium alloySurface roughnessGrain refinementElectrochemical impedance spectroscopy
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