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 

机构地区：[1]School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China [2]State Key Laboratory of Rare Earth Resources Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China [3]Key Lab of Automobile Materials,College of Materials Science and Engineering,Jilin University,Nanling Campus,Changchun 130025,China

出　　处：《Journal of Magnesium and Alloys》2020年第4期1269-1280,共12页镁合金学报（英文）

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).

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 study.Compared 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 growth.The 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 performance.The 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 resistance.Therefore,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.

关 键 词：Extruded Mg-Zn alloy Ca and Ce/La microalloying Microstructure evolution Bio-corrosion behaviors 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG172[金属学及工艺—金属材料]