利用质量损失法及X射线衍射(XRD)、扫描电镜(SEM)测试手段研究了铸态和挤压态AZ31B镁合金在模拟流动海水中浸泡12 h的腐蚀行为及随流速变化的规律。结果表明,AZ31B铸态镁合金试样的耐蚀性要远大于挤压态试样,且二者的腐蚀速率随搅拌速度增加的变化趋势有所不同:铸态试样的腐蚀速率随搅拌速度的增加近似呈线性上升,而挤压态试样的腐蚀速率随搅拌速度的增加而先增大后下降。 The corrosion behavior and the variation with the flow rate of as-cast and extruded AZ31B magnesium alloy in simulated flowing sea water for 12 h were studied by mass loss method, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the corrosion resistance of AZ31B as-cast magnesium alloy specimens is much larger than that of extruded specimens, and the corrosion rate changes with the increase of stirring speed. The corrosion rate of as-cast specimens varies with the stirring speed Increases almost linearly, while the corrosion rate of extruded samples increases first and then decreases with the increase of stirring speed.