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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Mg65Y10 Cu2 5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Mg65Y10 Cu2 5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 2 4h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Mg65Y10 Cu2 5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
The corrosion behavior of Mg65Y10 Cu2 5 amorphous and its corresponding crystallized alloy in 35% NaCl solution was studied by electrochemical polarization curve, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Polarization curve test results show that the amorphous alloy Mg65Y10 Cu2 5 is active dissolved in NaCl solution and the corrosion reaction is controlled by the cathode reaction and the anode reaction. EIS tests showed that the corrosion resistance of amorphous alloys decreased with the soaking time, and the EIS changed from three time constants to two time constants. The SEM results showed that the surface of the amorphous alloy was very uneven after immersion for 24 hours. The EDAX spectrum showed that the surface composition of the amorphous alloy changed greatly after soaking, the content of Mg decreased and the surface appeared Oxygen concentration unevenly distributed. The corrosion resistance of Mg65Y10 Cu2 5 alloy after crystallization is slightly increased. The corrosion mechanism of amorphous alloy in 35% NaCl solution was discussed