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A comparison study of Ce/La and Ca microalloying on the bio-corrosion behaviors of extruded Mg-Zn alloys

A comparison study of Ce/La and Ca microalloying on the bio-corrosion behaviors of extruded Mg-Zn alloys

作     者:J.H.Chu L.B.Tong Z.H.Jiang D.N.Zou Q.J.Wang S.F.Liu H.J.Zhang J.H. Chu;L.B. Tong;Z.H. Jiang;D.N. Zou;Q.J. Wang;S.F. Liu;H.J. Zhang

作者机构:School of Metallurgical EngineeringXi'an University of Architecture and TechnologyXi'an 710055China State Key Laboratory of Rare Earth Resources UtilizationChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Key Lab of Automobile MaterialsCollege of Materials Science and EngineeringJilin UniversityNanling CampusChangchun 130025China 

出 版 物:《Journal of Magnesium and Alloys》 (镁合金学报(英文))

年 卷 期:2020年第8卷第4期

页      面:1269-1280页

核心收录:

学科分类:080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)] 

基  金:the National Natural Science Foundation(Grant nos.5177117&51671152 and 51874225) the Key Research and Development Program of Shanxi Province(Grant nos.2020KWZ-007 and 2018ZDXMGY-149) the Youth Innovation Team of Shanxi Universities and the Natural Science Foundation of Jilin Province(Grant no.20180414016GH) 

主  题:Extruded Mg-Zn alloy Ca and Ce/La microalloying Microstructure evolution Bio-corrosion behaviors 

摘      要:The influences of Ca and Ce/La microalloying on the microstructure evolution and bio-corrosion resistances of extruded Mg-Zn alloys have been systematically investigated in the current *** with single Ca or Ce/La addition,the Ca-Ce/La cooperative microalloying results in an outstanding grain refinement,because the fine secondary phase particles effectively hinder the recrystallized grain *** coarse Ca2Mg6Zn3 phases promote the formation of Ca3(PO4)2 or hydroxyapatite particles during the immersion process and accelerate the dissolution of the corrosion product film,which destroys its integrity and results in the deterioration of anti-corrosive *** Ce/La elements can be dispersed within the conventional Mg7Zn3 phases,which reduce the internal galvanic corrosion between Mg matrix and the secondary phases,leading to an obvious improvement of corrosion ***,the Ca-Ce/La cooperative microalloying achieves a homogenous fine-grained microstructure and improves the protective ability of surface film,which will pave a new avenue for the design of biomedical Mg alloys in the coming future.

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