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在电解加钛Al-Mg-Si合金研究基础上,为了研究添加一定量杂质元素的Al-Mg-Si基合金的组织和性能,添加了0.2%混合稀土,通过极化曲线、透射电镜和扫描电镜研究了不含稀土和含稀土的合金在NaCl溶液中腐蚀电化学行为。结果表明,在5%NaCl溶液中,添加稀土后合金的自腐蚀电位明显负移,且ΔE也有所增大。主要原因是合金中添加0.2%RE后,在TEM中发现了周期性分布的调幅组织和细小的β″相,析出相的密度较大,尺寸较小,即加入稀土增加了合金微观组织的均匀性,净化了合金,使含稀土合金具有较高的电化学腐蚀抗力。
Based on the study of electrolytically Ti-Al-Mg-Si alloy, 0.2% rare earth elements were added to investigate the microstructure and properties of Al-Mg-Si based alloys with a certain amount of impurity elements added. The polarization curves, TEM and scanning The electrochemical corrosion behavior of rare earth-free and rare earth-containing alloys in NaCl solution was studied electronically. The results show that in 5% NaCl solution, the corrosion potential of the alloy obviously shifts negatively and the ΔE also increases. The main reason is that after the addition of 0.2% RE, the periodic distribution of the amplitude modulation microstructure and the small β "phase are found in the TEM. The precipitated phase is larger in density and smaller in size, that is, the addition of rare earth increases the uniform microstructure of the alloy Purity of the alloy, the rare earth alloy with high electrochemical corrosion resistance.