腐蚀行为
(1.中国科学院 金属研究所,
金属腐蚀与防护国家重点实验室, 沈阳 110016;
2. 中国科学院 金属研究所,
沈阳材料科学国家(联合)实验室, 沈阳 110016)
摘 要: 利用电化学极化曲线方法、交流阻抗(EIS)技术和扫描电子显微镜(SEM)研究了Mg65Y10Cu25非晶及相应的晶化合金在3.5%NaCl溶液中的腐蚀行为。极化曲线测试结果表明，非晶合金Mg65Y10Cu25在NaCl溶液中为活性溶解，腐蚀反应由阴极反应和阳极反应共同控制。EIS测试表明，随着浸泡时间延长，非晶合金耐蚀性下降，EIS由３个时间常数变为２个时间常数。SEM测试表明，非晶合金经过24h浸泡后，表面发生了极为不均匀的腐蚀；EDAX能谱表明，非晶合金经过浸泡后，表面成分发生了较大变化，含镁量减少，表面出现了浓度分布不均匀的氧元素。晶化后Mg65Y10Cu25合金的耐蚀性略有提高。探讨了非晶合金在3.5%NaCl溶液中的腐蚀机理。
关键字: Mg65Y10Cu25非晶合金; 电化学; 交流阻抗; 腐蚀行为
Mg65Y10Cu25 amorphous alloy in
3.5% NaCl solution
（1 State Key Laboratory for Corrosion and Protection,
Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China;
2 Shenyang National Laboratory for Materials Science,
Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:Corrosion behaviors of amorphous alloy Mg65Y10Cu25 and its corresponding crystalline multiphase alloy in 3.5%NaCl solution were studied by electrochemical methods and scanning electronic microscopy technology (SEM) Potentiodynamic experiments show that active dissolution takes place in Mg65Y10Cu25 amorphous alloy in NaCl solution, and the corrosion is controlled by both anodic and cathodic reactions The corrosion resistance decreases with the elongation of immersion time EIS experiments show that the time constants decrease from three to two when the amorphous alloy is immersed more than 6h SEM experiment shows that very non-even corrosion takes place in the amorphous alloy when immersed for 24h in NaCl solution The content of elements of the alloy surface changes greatly The content of Mg decreases, while a new element of oxygen is found on the surface and its content varies greatly in different areas The corrosion resistance of crystalline multiphase alloy is slightly increased The corrosion mechanism of this alloy in 3.5%NaCl solution is also discussed
Key words: Mg65Y10Cu25 amorphous alloy; electrochemistry; EIS; corrosion behavior
