Enhancing the Corrosion Resistance of FeNiCoCrW_(0.2)Al_(0.1) High‑Entropy Alloy in 3.5 wt%NaCl Solution by Bilayer Passivation  

作　　者：Jingxiang Xu Yuyan Yang Ruiyang Huang Xinwei Yuan Huakang Bian Zhenhua Chu Yang Wang Yanhua Lei 

机构地区：[1]College of Engineering Science and Technology,Shanghai Ocean University,Shanghai 201306,China [2]Materials Genome Institute,Shanghai University,Shanghai 200444,China [3]Shanghai Frontier Science Center of Mechanoinformatics,Shanghai University,Shanghai 200444,China [4]Research Institute of Frontier Science,Southwest Jiaotong University,Chengdu 610031,China [5]College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2025年第3期407-418,共12页金属学报(英文版)

基　　金：supported by the Natural Science Foundation of Shanghai(No.20ZR1424000);the National Natural Science Foundation of China(No.52305214);the Sichuan Science and Technology Program(No.2023YFSY0004).

摘　　要：The strong corrosion resistance and corrosion behavior of the FeNiCoCrW_(0.2)Al_(0.1) high-entropy alloy in 3.5 wt%NaCl solution was investigated.In order to explain the Cl−induced degradation of diferent metal oxides on the surface of the passivate film,the energy required for the interaction of the corrosion oxidation products NiO,CoO,Fe_(2)O_(3),and Cr_(2)O_(3) surfaces with Cl−is compared and calculated based on the assumptions of the point defect model and the density functional theory by using the electrochemical impedance spectroscopy and the X-ray photoelectron spectroscopy for the analysis of the monodouble-layer structure and elemental compositions of passivate film in the corrosion process.The combined experimental and simulation results showed that the alloy passivates naturally in air,forming a single passivation layer.The compositional layering of the passivation film in 3.5 wt%NaCl solution occurred with the increase of the contact time with NaCl.A doublelayer passivation with a two-layered combinatorial structure was formed due to the imbalanced depletion of Co and Fe during corrosion,and that the dense outer structure of this high-entropy alloy,which was made up of NiO and Cr_(2)O_(3),provided the predominantly high corrosion resistance.This paper provided a new perspective to study the strong corrosion resistance of FeNiCoCr-based high-entropy alloys.

关 键 词：High-entropy alloys Passivation films Corrosion Density functional theory 

分 类 号：TG1[金属学及工艺—金属学]