Nitrogen-induced optimization of corrosion resistance for nanocrystalline soft magnetic Fe-Zr-B alloys  

作　　者：Haoran Ma Wenquan Wang Yanxin Liu Xiahe Liu Aina He Yaqiang Dong Yong Wang Jiawei Li 

机构地区：[1]CAS Key Laboratory of Magnetic Materials and Devices,and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology,Ningbo Institute of Materials Technology&Engineering,Chinese Academy of Sciences,Ningbo 315201,China [2]Department of Mechanical Science and Engineering,Northeast Petroleum University,Daqing 163318,China [3]Shenyang National Laboratory for Materials Science,Northeastern University,Shenyang 110819,China [4]School of Metallurgy,Northeastern University,Shenyang 110819,China [5]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Materials Science & Technology》2024年第19期15-27,共13页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(Nos.51771215,51701038,and 51974091);the Natural Science Foundation of Liaoning Provincial Department of Science and Technology(No.2021-MS-308);the Fundamental Research Funds for the Central Universities(No.N2125009).

摘　　要：The poor corrosion resistance restricts the industrial applications of nanocrystalline soft magnetic Fe-Zr-B alloys.We reported a facile plasma-nitriding surface process to enhance the corrosion resistance of a nanocrystalline Fe90 Zr7 B3 alloy without deteriorating its soft magnetic properties.Potentiodynamic po-larization and electrochemical impedance spectroscopy were performed to investigate the corrosion be-havior.The nitrided alloy shows higher corrosion resistance than the untreated alloy,as evidenced by a nobler corrosion potential,lower corrosion current and higher polarization resistance of surface corrosion film,while their magnetic properties are similar.The microstructures of both nanocrystalline alloys were examined by high-resolution transmission electron microscopy(HRTEM)and the compositions of their corrosion films analyzed by X-ray photoelectron spectroscopy(XPS).For the nitrided alloy,a more homo-geneous nanocrystalline structure developed in the surface nitrided layer containing corrosion-resistant nitride phases(Fe3 N and ZrN)provides a higher resistance against chloride corrosion.Moreover,the ni-trided layer facilitates the formation of a more protective corrosion film with the increased ratios of Fe2+/Fe3+and O2−/OH−as well as higher enrichment of Zr-and B-oxides,while the N-species(NH4+and NO3−)formed in the corrosion film behave as good corrosion inhibitors and further enhance the film pro-tection.Our findings provide a simple strategy for the preparation of corrosion-resistant nanocrystalline soft magnetic alloys to satisfy a variety of engineering requirements.

关 键 词：Plasma-nitriding Nanocrystalline soft magnetic Fe-based ALLOYS Corrosion resistance Corrosion film 

分 类 号：TB383[一般工业技术—材料科学与工程]