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Magnesium and its alloys have aroused tremendous interests because of theirpromising mechanical properties and biocompatibility. However, theirexcessively fast corrosion rate hinders the development of Mg alloys in thebiomedical fields. Inspired by conventional ion implantation, a less-toxicfunctional group (hydroxyl) is used as the ion source to bombard the ZK60 Mgalloy surface to form a functionalized oxide layer. This functionalized oxidelayer significantly facilitates the corrosion resistance of the ZK60 Mg alloysubstrate and the proliferation of MC3T3-E1 cells, which is confirmed byelectrochemical, immersion, and in vitro cytocompatibility tests. In comparisonwith results of ZK60 alloy implanted with carboxyl ions in our previous work,it is concluded that hydroxyl-treated alloys exhibit slightly higher corrosionrate while better biocompatibility. In summary, less-toxic functional ionimplantation can be an effective strategy for inhibiting corrosion of Mg alloyimplants and promoting their biocompatibility.

Anticorrosion and biocompatibility of a functionalized layer formed on ZK60 Mg alloy via hydroxyl ion implantation