Corrosion behavior of as-cast Al_(0.75)CoFeCr_(1.25)Ni high entropy alloy in 0.5 mol/L NaOH solution  

作　　者：Si-jia Nie Xue-ning Yi Hui-ling Zhou Hao-jie Zhu Lan-lan Yang Fang-lian Fu Jing-yong Li Hao-kun Yang Guo-xiang Xu Sheng Lu Yan-xin Qiao 

机构地区：[1]School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang,212003,Jiangsu,China [2]School of Nuclear Equipment and Nuclear Engineering,Yantai University,Yantai,264005,Shandong,China [3]Guangxi Liugong Machinery Co.,Ltd.,Liuzhou,545007,Guangxi,China [4]Smart Manufacturing Division(SMD),Hong Kong Productivity Council,Hong Kong,999077,China

出　　处：《Journal of Iron and Steel Research International》2024年第11期2852-2863,共12页钢铁研究学报（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.52001142 and 51975263);National Key Research and Development Program of China(No.2021YFB3401100);Young Elite Scientists Sponsorship Program by CAST(2022QNRC001).

摘　　要：The corrosion behavior of an Al_(0.75)CoFeCr_(1.25)Ni high-entropy alloy (HEA) in 0.5 mol/L NaOH solution was investigated using a series of electrochemical and analytical techniques, including X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, potentiodynamic polarization measurement and electrochemical impedance spectroscopy. The results showed that the Al_(0.75)CoFeCr_(1.25)Ni HEA exhibited a typical columnar dendritic structure, which is composed of face-centered cubic, body-centered cubic (BCC), and ordered BCC phases (B2 phase). The corrosion resistance of this HEA in 0.5 mol/L NaOH solution is comparable to that of 304 SS, attributed to the change in the composition of the passive film formed on the surface. Although the passive film formed was generally rich in Al, the proportion of Cr_(2)O_(3) inside it increased with the increasing immersion time, enhancing the stability of the passive film and thus improving the corrosion performance of this HEA in 0.5 mol/L NaOH solution.

关 键 词：High entropy alloy CORROSION Electrochemical behavior X-ray photoelectron spectroscopy Passive film 

分 类 号：TG139[一般工业技术—材料科学与工程]