剪切带修复对Pd基块体非晶合金耐蚀性能的影响  

Effect of Self-healing of Shear Band on Corrosion Resistance of the Pd-based Amorphous Alloys

作　　者：刘伟[1] 刘丽[1] 宋贺[1] 熊珊[1] 杜伟[1] 赵相金[1] 

机构地区：[1]烟台大学,山东烟台264005

出　　处：《稀有金属材料与工程》2017年第10期3053-3057,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51101133和51101134);山东省优秀中青年科学家科研奖励基金(BS2012CL036);山东省自然科学基金(ZR2011EL025)

摘　　要：以Pd_(79)Cu_4Au_2Si_(10)P_5(at%)块体非晶合金为研究对象,采用电化学极化曲线和电化学阻抗测试方法研究了剪切带自修复对其在质量分数3%NaCl溶液和1 mol/L HCl溶液中耐蚀性能的影响。通过研究极化曲线中的自腐蚀电位和自腐蚀电流密度得知,修复后样品耐腐蚀性能优于修复前样品,但仍低于原始样品(即未变形样品)。电化学阻抗研究结果显示,在开路电位下阻抗图均有单一容抗弧构成,修复后样品的电化学转移电阻Rt小于原始样品的、但大于修复前样品的,这进一步表明修复提高了材料的耐腐蚀性能,但仍未达到原始样品的耐蚀性。扫描电镜研究发现,合金表面发生明显的点蚀,其中原始样品的点蚀坑数量最少,修复后样品的次之,修复前样品的最多。The effect of shear band self-healing on corrosion behaviors of Pd_（79）Cu_4Au_2Si_（10）P_5 amorphous alloy in 3 wt% NaCl and 1 mol/L HCl solutions was studied by potentiodynamic polarization experiments and electrochemical impedance spectroscopy（EIS）. The results of potentiodynamic polarization experiments show that the self-healing sample has better corrosion resistance than the unrepaired sample, but the as-cast sample has the best corrosion resistance. EIS results show that the Nyquist figures of all the studied samples are composed of one single semi-circle in the state of open circuit potential. The repaired sample has a higher charge transfer reaction resistance than the unrepaired sample, and the as-cast sample has the highest charge transfer reaction resistance. This result accords with that of potentiodynamic polarization. Surface analysis by SEM shows that all the samples are eroded by pitting corrosion. The pitting amount on the surface of the as-cast sample is the least, and that of the un-healing sample is the largest.

关 键 词：Pd基块体非晶合金 自修复 电化学测试 腐蚀行为 

分 类 号：TG139.8[一般工业技术—材料科学与工程]