Wu Guangxin, Li Gaosheng, Wei Lijun, Chen Hao, Wang Yujie, Qiao Yunze, Hua Yu, Shi Chenyang, Huang Yingde, Yang Wenjie
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.
State Power Investment Corporation Limited Central Research Institute, Beijing 102209, China.
Materials (Basel). 2025 Aug 5;18(15):3679. doi: 10.3390/ma18153679.
This study synthesized FeNiCuAlX high-entropy alloys (HEAs) (where X = Cr, Co, Mn) using arc melting and investigated their high-temperature oxidation behavior in air at 900 °C. The oxidation kinetics of all alloys followed a parabolic rate, with the oxidation rate constants (kp) of FeNiCuAlCr, FeNiCuAlCo, and FeNiCuAlMn being approximately two to three orders of magnitude lower than that of the FeNiCu alloy. Specifically, FeNiCuAlCr exhibited the lowest kp value of 1.72 × 10 mg·cm/s, which is significantly lower than those of FeNiCuAlCo (3.29 × 10 mg·cm/s) and FeNiCuAlMn (1.71 × 10 mg·cm/s). This suggests that the addition of chromium promotes the formation of a dense AlO/CrO oxide layer, significantly enhancing the oxidation resistance. Furthermore, corrosion resistance was assessed through potentiodynamic polarization and electrochemical impedance spectroscopy in a 3.5% NaCl solution. FeNiCuAlCr demonstrated exceptional resistance to localized corrosion, as indicated by its low corrosion current density (45.7 μA/cm) and high pitting potential (-0.21 V), highlighting its superior corrosion performance.
本研究采用电弧熔炼法合成了FeNiCuAlX高熵合金（HEAs）（其中X = Cr、Co、Mn），并研究了它们在900℃空气中的高温氧化行为。所有合金的氧化动力学均遵循抛物线速率规律，FeNiCuAlCr、FeNiCuAlCo和FeNiCuAlMn的氧化速率常数（kp）比FeNiCu合金低约两到三个数量级。具体而言，FeNiCuAlCr的kp值最低，为1.72×10⁻⁶mg·cm⁻²/s²，显著低于FeNiCuAlCo（3.29×10⁻⁶mg·cm⁻²/s²）和FeNiCuAlMn（1.71×10⁻⁶mg·cm⁻²/s²）。这表明添加铬促进了致密的Al₂O₃/Cr₂O₃氧化层的形成，显著提高了抗氧化性。此外，通过动电位极化和电化学阻抗谱在3.5% NaCl溶液中评估了耐腐蚀性。FeNiCuAlCr表现出优异的抗局部腐蚀性能，其低腐蚀电流密度（45.7 μA/cm²）和高点蚀电位（-0.21 V）表明了其卓越的腐蚀性能。
