Recently there has been interest in employing degradable metallic implants for internal fixation in bone fracture healing. The major advantage of using degradable implants is to avoid a second surgery to remove the implants when bone healing has completed. The concept is similar to that of resorbable suture. Mg, by virtue of its desirable mechanical properties, degradability, and biocompatibility, is an ideal potential candidate except that its corrosion rate in vivo is too high. Thus increasing the corrosion resistance of Mg is the key problem to address in the development of degradable Mg implants. One possible route is by way of surface treatment, which would lower the corrosion rate at the initial phase of bone healing, the period during which the implant provides mechanical support for the broken bone. In the present study cerium oxide coating was prepared on pure Mg by immersion or by cathodic deposition in cerium nitrate solution. The coated samples were characterized by scanning-electron microscopy (SEM) and X-ray diffractometry (XRD). The corrosion resistance in Hanks’ solution (a simulated body fluid) was studied using polarization method and electrochemical impedance spectroscopy (EIS). With properly chosen processing parameters, an adherent cerium oxide coating was formed on Mg. The corrosion resistance of cerium oxide coated Mg in Hanks’ solution at 37 °C and pH 7.4 was significantly higher than that of bare Mg.

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