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对Mg-2Zn-0.4Ca-0.2Mn镁合金分别进行了380、420℃保温8 h的均匀退火处理。并采用析氢浸泡实验、扫描电镜、金相显微镜、体视显微镜等测试手段,研究了均匀退火处理对镁合金组织和耐腐蚀性的影响。结果表明:Mg-2Zn-0.4Ca-0.2Mn镁合金均匀退火后显微组织趋于均匀等轴,成链状分布在晶界处及成珍珠状分布在晶粒内的第二相含量随着退火温度的升高明显减少,经均匀退火后镁合金的耐腐蚀性也明显得到了增强。经过退火后镁合金表面的腐蚀形貌由未热处理的点状转变为局部均匀,在一定程度上改善了镁合金点状腐蚀,减少了断裂失效破坏。
The Mg-2Zn-0.4Ca-0.2Mn magnesium alloy was annealed at 380 and 420 ℃ for 8 h. The effects of uniform annealing on the microstructure and corrosion resistance of magnesium alloy were studied by means of hydrogen evolution immersion test, scanning electron microscopy, metallographic microscope and stereo microscope. The results show that the microstructures of Mg-2Zn-0.4Ca-0.2Mn alloy annealed uniformly are equiaxed, and the content of second phase distributed in the grain boundary and distributed in the grains as chains The increase of annealing temperature decreases obviously, and the corrosion resistance of magnesium alloy obviously increases after the uniform annealing. After annealing, the corrosion morphology of the surface of the magnesium alloy is transformed from a non-heat treated point to a local uniform, which improves the pitting corrosion of the magnesium alloy to a certain extent and reduces the failure failure of the magnesium alloy.