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利用Mg-30%Nd(质量分数)中间合金对Mg-6Zn-Mn(ZM61)合金进行了变质处理。通过显微组织观察、物相分析、动电位极化测试和浸泡实验研究了Nd含量对ZM61镁合金组织及腐蚀性能(3.5%Na Cl溶液中)的影响。结果表明,稀土Nd能够细化ZM61合金组织,提高其耐腐蚀性能。Nd含量增加,新生成的第二相在晶界处呈半连续网状分布。稀土Nd添加量达到1.5%时,合金的腐蚀电位比ZM61合金提高256m V,腐蚀电流密度降低为3.678×10-6A/cm2,腐蚀速率降低50%,耐腐蚀性最好。
The Mg-6Zn-Mn (ZM61) alloy was modified by Mg-30% Nd (mass fraction) master alloy. The effects of Nd content on the microstructure and corrosion properties of ZM61 magnesium alloy (3.5% NaCl solution) were investigated by microstructure observation, phase analysis, potentiodynamic polarization test and immersion test. The results show that rare earth Nd can refine the microstructure of ZM61 alloy and improve its corrosion resistance. Nd content increased, the newly formed second phase in the grain boundary was semi-continuous network distribution. The corrosion potential of alloy increases by 256m V than that of ZM61 alloy and the corrosion current density decreases to 3.678 × 10-6A / cm2, the corrosion rate decreases by 50% and the corrosion resistance is the best.