Effect of Mo and aging temperature on corrosion behavior of (CoCrFeNi)100-Mo high-entropy alloys
作者:Wenrui Wang、Jieqian Wang、Zhihui Sun、Jiangtao Li、Laifeng Li、Xin Song、Xiaodong Wen、Lu Xie、Xiao Yang
DOI:10.1016/j.jallcom.2019.152139
日期:2020.1
spectroscopy in 3.5% NaCl solution indicate that the corrosion resistance of the alloys gradually increases with increasing aging temperature and Mo content. However, the corrosion resistance of (CoCrFeNi)97Mo3 alloy aged at 900 °C decreased suddenly. XPS analysis reveals that the main components of the passive film are Cr2O3 and MoO3, and the intensity of Cr2O3 and MoO3 in the passive film tends to increase
摘要 本工作研究了Mo添加剂和时效温度对3.5% NaCl溶液中显微组织和腐蚀行为的影响。(CoCrFeNi)100-xMox(x = 1, 2, 3) 合金在 700 °C 和 900 °C 时效时的微观结构包括单一 FCC 固溶体结构。当Mo含量从1%增加到2%时,在3.5% NaCl溶液中的极化曲线和电化学阻抗谱表明,合金的耐腐蚀性能随着时效温度和Mo含量的增加而逐渐增加。然而,(CoCrFeNi)97Mo3 合金在 900 °C 时效时的耐蚀性突然下降。XPS分析表明钝化膜的主要成分是Cr2O3和MoO3,钝化膜中Cr2O3和MoO3的强度随着Mo从1%增加到2%有增加的趋势,可以提高钝化膜的稳定性。第一性原理计算用于理解Cl-对钝化膜点蚀机制的影响。