机械锤击对AZ31B表面晶粒尺寸及耐腐蚀性的影响研究

Study on Effects of Mechanical Hammering on Surface Grain Size and Corrosion Resistance of AZ31B

为解决AZ31B镁合金在人体环境中耐腐蚀性较差、降解速度过快等问题,提出了机械锤击表面改性方法。为揭示机械锤击对AZ31B镁合金表面耐腐蚀的影响机理,对AZ31B镁合金的X衍射图谱进行了分析计算,并利用电化学工作站以及蔡司显微镜表征了锤击前后AZ31B镁合金的耐腐蚀性能。结果表明:经机械锤击处理后,材料的表面晶粒尺寸最小减小到38.55 nm,腐蚀电流密度降低了93.92%,且晶粒尺寸越小,耐腐蚀性越好,表明机械锤击能有效提高AZ31B镁合金的耐腐蚀性。

In order to solve the problems of poor corrosion resistance and rapid degradation of AZ31B magnesium alloy in human environment,a mechanical hammering surface modification method was proposed.In order to reveal the influence mechanism of mechanical hammering on the corrosion resistance of AZ31B magnesium alloy surface,the X-ray diffraction pattern of AZ31B magnesium alloy was analyzed and calculated,and the corrosion resistance of AZ31B magnesium alloy before and after hammering was characterized by electrochemical workstation and Zeiss microscope.The results show that after the mechanical hammering treatment,the surface grain size of the material is minimized to 38.55 nm,the corrosion current density is reduced by 93.92%,and the smaller the grain size,the better the corrosion resistance,which indicate that the mechanical hammering can effectively improve the corrosion resistance of AZ31B magnesium alloy.