FeNi_2CoMo_(0.2)V_(0.5)高熵合金在2% HNO_3溶液中的电化学性能

Electrochemical Properties of FeNi_2CoMo_(0.2)V_(0.5) High Entropy Alloy in 2% HNO_3 Solution

通过开路电位测试、交流阻抗谱、动电位极化曲线测试,对比研究了FeNi_2CoMo_(0.2)V_(0.5)高熵合金与其成分金属纯镍(99.99%)的耐腐蚀性能。结果表明:在2%HNO_3溶液中,高熵合金比纯镍能更快达到稳定电位,高熵合金阻抗弧直径是HPT态样品的4倍多,自腐蚀电流密度比纯镍小6倍左右;另外,高熵合金和纯镍在2%的HNO_3溶液中均发生明显钝化,但高熵合金钝化效果明显优于纯镍,钝化区更宽,击穿电位更高。

The corrosion resistance of FeNi_2CoMo_（0.2）V_（0.5） in high entropy alloy and its constituent metal pure nickel（ 99. 99%） was studied by open circuit potential test,including the electrochemical impedance spectroscopy and the curve test of potentiodynamic polarization. The results show that high entropy alloy can reach the stable potential faster than that of pure nickel in the 2% HNO_3 solution. The impedance arc diameter of the high entropy alloy is more than four times that of the pure nickel. Self-corrosion current density is about 6 times lower than that of pure nickel. In addition,high entropy alloy and pure nickel in 2% HNO_3 solution were significantly passivated,but the high entropy alloy in passivation effect was better than pure nickel with passivation area wider and breakdown potential higher.