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Magnesium alloys have been considered to be potential biocompatible metallicmaterials. Further improvement on the anti-corrosion is expected to make thistype of materials more suitable for biomedical applications in the fields oforthopedics, cardiovascular surgery and others. In this paper, we introduce amethod of carboxyl ion (COOH+) implantation to reduce the degradation of ZK60Mg alloy and improve its functionality in physiological environment. X-rayphotoelectron spectroscopy (XPS) and atomic force microscopy (AFM) experimentsshow the formation of a smooth layer containing carbaxylic group, carbonate,metal oxides and hydroxides on the ion implanted alloy surface. Corrosionexperiments and in vitro cytotoxicity tests demonstrate that the ionimplantation treatment can both reduce the corrosion rate and improve thebiocompatibility of the alloy. The promising results indicate that organicfunctional group ion implantation may be a practical method of improving thebiological and corrosion properties of magnesium alloys.

Improvement on corrosion resistance and biocompability of ZK60 magnesium alloy by carboxyl ion implantation