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采用真空电弧熔炼的方法制备了Al-Zr-Nd合金。经500℃充分退火后,采用X射线衍射、电化学测试和金相显微分析等方法对合金的相组成及其在3.5%NaCl溶液中腐蚀行为进行了研究。结果表明,主相为铝固溶体的合金发生明显的钝化现象,与纯铝相似,但钝化区更短,腐蚀从点蚀开始并向基体铝扩展,出现选择性腐蚀;其余合金不发生点蚀,表现为活性阳极溶解过程,腐蚀从缺陷和晶界处开始并扩展至易腐蚀相,导致易腐蚀相的选择性腐蚀,其中铝固溶相由于电位最负而最先腐蚀,其次是铝和钕组成的二元相,最后是铝和锆组成的二元相。
Al-Zr-Nd alloy was prepared by vacuum arc melting. After annealing at 500 ℃, the phase composition of the alloy and its corrosion behavior in 3.5% NaCl solution were studied by X-ray diffraction, electrochemical tests and metallographic analysis. The results show that the alloy with the main phase of aluminum solid solution shows obvious passivation phenomenon, which is similar to that of pure aluminum, but the passivation zone is shorter. The corrosion starts from the pitting corrosion and expands to the matrix aluminum with selective corrosion. The rest of the alloy does not occur Erosion shows active anodic dissolution process. Corrosion begins at defects and grain boundaries and expands to the erosive phase, resulting in the selective corrosion of the erosive phase. The aluminum solution phase first corrodes due to the most negative potential, followed by aluminum And neodymium binary phase, and finally composed of aluminum and zirconium binary phase.