Corrosion Resistance of Co-Cr-Mo Alloy Treated by Electrolytic In-Process Dressing (ELID) Grinding/Thermal Oxidation Hybrid Process

概要

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A hybrid process combining electrolytic in-process dressing (ELID) grinding with thermal oxidation (TO) was performed to improve the corrosion resistance of Co-Cr-Mo alloy. The treated surfaces were observed and analyzed using scanning electron microscopy (SEM), glow discharge optical emission spectroscopy (GD-OES) and X-ray photoelectron spectroscopy (XPS). Corrosion resistance was evaluated using potentiodynamic polarization measurements and metallic ion elution tests. The color of the treated surfaces was changed and the level of oxygen content was significantly increased by thermal oxidation treatment. In particular, specimens treated with ELID/TO hybrid processing had thicker oxide layers than those of the polished and thermal oxidation hybrid processed (P/TO) specimens. In addition, the amount of cobalt on the surface was diminished by ELID/TO hybrid processing. Specimens treated by ELID/TO hybrid processing exhibited lower amounts of cobalt ion elution among all the specimens. These results suggest that application of the ELID/TO hybrid process as a surface finishing method for metal implants can improve corrosion resistance.