title: Influence of biocompatible metal ions (Ag, Fe, Y) on the surface chemistry, corrosion behavior and cytocompatibility of Mg-1Ca alloy treated with MEVVA.
abstract: Mg-1Ca samples were implanted with biocompatible alloy ions Ag, Fe and Y respectively with a dose of 2×10(17)ionscm(-2) by metal vapor vacuum arc technique (MEVVA). The surface morphologies and surface chemistry were investigated by SEM, AES and XPS. Surface changes were observed after all three kinds of elemental ion implantation. The results revealed that the modified layer was composed of two sublayers, including an outer oxidized layer with mixture of oxides and an inner implanted layer, after Ag and Fe ion implantation. Y ion implantation induced an Mg/Ca-deficient outer oxidized layer and the distribution of Y along with depth was more homogeneous. Both electrochemical test and immersion test revealed accelerated corrosion rate of Ag-implanted Mg-1Ca and Fe-implanted Mg-1Ca, whereas Y ion implantation showed a short period of protection since enhanced corrosion resistance was obtained by electrochemical test, but accelerated corrosion rate was found by long period immersion test. Indirect cytotoxicity assay indicated good cytocompatibility of Y-implanted Mg-1Ca. Moreover, the corresponding corrosion mechanisms involving implanting ions into magnesium alloys were proposed, which might provide guidance for further application of plasma ion implantation to biodegradable Mg alloys.
authors.affiliation: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Bian
authors.affiliation: Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China.
authors.forename: Yuanhao
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Li
authors.affiliation: Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China.
authors.forename: Kejin
authors.initials: K
authors.lastname: Qiu
authors.affiliation: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China; Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China. Electronic address: yfzheng@pku.edu.cn.
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xian 710049, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Han
mesh_terms: D000497:Alloys; D001672:Biocompatible Materials; D003343:Corrosion; D008670:Metals / Q000737:chemistry*; D014618:Vacuum
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D008670:Metals
keywords: Biocompatibility; Corrosion property; Mechanism; Mg–Ca alloy; Plasma ion implantation