Controllable degradation of biomedical magnesium by chromium and oxygen dual ion implantation
2011
Xu, Ruizhen | Wu, Guosong | Yang, Xiongbo | Niuyuetaohua, | Lu, Qiuyuan | Chu, Paul K.
The surface stability of biodegradable magnesium is crucial to tissue growth on implants in the initial healing stage. Inspired by the design principle of biomedical stainless steels, we implant chromium as a passive element into pure magnesium to alter the surface biodegradation behavior. However, because Cr exists in the metallic state in the implanted layer to induce the galvanic effect, excessively fast degradation is observed. Ensuing implantation of oxygen produces a thicker surface oxidized layer composed of chromium oxide, which successfully retards the surface degradation of pure magnesium. The dual implantation process offers a promising means to improve the initial surface stability of Mg in the physiological environment.
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