混合稀土对ZM5镁合金在介质中耐蚀性的影响
Effect of Mischmetal on Corrosion Resistance of ZM5 Magnesium Alloy in Mediums
李华基, 杨志远, 刘志良
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作者单位：(重庆大学 材料科学与工程学院, 重庆 400044)
中文关键字：ZM5镁合金； 混合稀土； 微观组织； 耐蚀性
英文关键字：ZM5 magnesium alloy; mischmetal; microstructure; corrosion resistance
中文摘要：研究了添加0.1%的混合稀土对ZM5镁合金显微组织的影响，分析了ZM5和ZM5-0.1RE镁合金在不同介质中的腐蚀行为。结果表明：加入0.1%的混合稀土后ZM5镁合金组织细化，β相变得均匀、连续，且生成了块状分布的Al3Ce相和Al11La3相，降低了Al元素在晶粒内部的偏析，使得ZM5镁合金在pH=3的HCl溶液和pH=7的3.5%NaCl溶液中的耐蚀性得到提高。在pH=10的NaOH溶液中，ZM5镁合金腐蚀的热力学倾向降低，腐蚀轻微。
英文摘要：The effect of 0.1% mischmetal element addition on the microstructure of ZM5 magnesium alloy was studied,and the corrosion behavior of ZM5 and ZM5-0.1%RE magnesium alloy in different mediums was analyzed. The results show that 0.1% mischmetal element addition refines the micostructure, makes β phase continuous and well-distributed in the matrix, produces Al3Ce phase and Al11La3 phase, and reduces the segregation degree of Al. So, the corrosion resistance of ZM5 magnesium alloy in(pH=3) HCl and (pH=7) salt solution increases. In (pH=10) NaOH solution, the thermodynamic tendency of corrosion of ZM5 magnesium alloy reduces.