Influence of biocompatible metal ions (Ag, Fe, Y) on the surface chemistry, corrosion behavior and cytocompatibility of Mg-1Ca alloy treated with MEVVA

Yang Liu; Dong Bian; Yuanhao Wu; Nan Li; Kejin Qiu; Yufeng Zheng; Yong Han

doi:10.1016/j.colsurfb.2015.05.050

Influence of biocompatible metal ions (Ag, Fe, Y) on the surface chemistry, corrosion behavior and cytocompatibility of Mg-1Ca alloy treated with MEVVA

Colloids Surf B Biointerfaces. 2015 Sep 1:133:99-107. doi: 10.1016/j.colsurfb.2015.05.050. Epub 2015 Jun 6.

Authors

Yang Liu¹, Dong Bian¹, Yuanhao Wu², Nan Li¹, Kejin Qiu³, Yufeng Zheng⁴, Yong Han⁵

Affiliations

¹ Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
² Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China.
³ Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China.
⁴ 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.
⁵ State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xian 710049, China.

PMID: 26094143
DOI: 10.1016/j.colsurfb.2015.05.050

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.

Keywords: Biocompatibility; Corrosion property; Mechanism; Mg–Ca alloy; Plasma ion implantation.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Alloys*
Biocompatible Materials*
Corrosion*
Metals / chemistry*
Vacuum

Substances

Alloys
Biocompatible Materials
Metals