First-principles calculation and experimental study on the effect of rare earth Ce and Nd on the corrosion behavior of Mg alloys
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Published:2023-02-01
Issue:2
Volume:10
Page:026513
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ISSN:2053-1591
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Container-title:Materials Research Express
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language:
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Short-container-title:Mater. Res. Express
Author:
Liu Xiaolian,
Jia RuilingORCID,
Fu Xiaoyu,
Cheng Wenhua,
Zhang Huixia,
Zhao Erjun
Abstract
Abstract
In this study, the influence mechanism of rare earth elements Ce and Nd on the corrosion behavior of Mg alloy was studied by combining experimental characterization with the first-principles calculation. The changes of work function and surface energy of the rare Earth phase and matrix phase in binary rare Earth Mg alloys Mg-0.3%Ce and Mg-0.3%Nd. In addition, the electronic properties of the second rare Earth phase and matrix phase, and the correlation between the interface energy of the second rare Earth phase and matrix and the corrosion behavior of Mg alloys were investigated. The experimental results show that Mg12Ce and Mg12Nd as the second phases of Mg-0.3%Ce and Mg-0.3%Nd, respectively, have not obvious roles in the galvanic corrosion of the alloys. The corrosion morphology of the two alloys is similar, the matrix undergoes filamentary corrosion through the grain to a large area. The results of the first-principles calculation show that the binding energy of the rare Earth phase is higher than that of the matrix phase, this implied the addition of light rare Earth elements Ce and Nd can improve the stability of the second phase. The work function of different surfaces of the second phase is similar to that of the matrix phase, so limited effect of the rare Earth phase on corrosion behavior has been found. In addition, the addition of rare Earth Ce and Nd will decrease the surface stability of Mg matrix, this result reaffirms the higher corrosion rates of Mg-0.3%Ce and Mg-0.3%Nd over that of the pure Mg.
Funder
National Natural Science Foundation of China
Postgraduate Research Innovation Project of Inner Mongolia Autonomous Region
Subject
Metals and Alloys,Polymers and Plastics,Surfaces, Coatings and Films,Biomaterials,Electronic, Optical and Magnetic Materials
Reference18 articles.
1. Current status and prospects of research and development of Mg alloys;Qudong;World Nonferrous Metals,2004
2. Analysis of the surface film formed on Mg by exposure to water using a FIB cross-section and STEM-EDS;Taheri;Corros. Sci.,2012
3. Characterization of phases in a Mg-6Gd-4Sm-0.4Zr (wt%) alloy during solution treatment;Zhang;Mater. Charact.,2009
4. Effect of rare Earth cerium and lanthanum alloying on the corrosion behavior of AZ91;Zhong;Corros. Sci. Prot. Technol.,2009
5. Effect of Nd content and solid solution treatment process on the properties of Mg-4Zn-xNd Mg alloy;Deng Weilin;Hot Processing Technology,2017