Variations in Corrosion Resistance of Ti-Ni Alloy Tooled by ELID （Electrolytic In-Process Dressing） Grinding Methods under the Mouth Condition

Abstract

This study examined the corrosion resistance of a Ti-Ni alloy used as implant material in the oral cavity, by applying the ELID method on the mirror grinding finish. Comparing the anode polarization curves in artificial body fluid, the anode polarization curve for ELID grinding material was found to be in the low current density area, indicating excellent corrosion resistance compared to a buffing material and SiC waterproof grinding material. Comparing the anodic polarization curves in a 1% lactic acid solution, the ELID mirror grinding finish material was found to be in a lower current density area than the buffing material and SiC waterproof grinding material, indicating better corrosion resistance. Furthermore, the effectiveness of the ELID grinding method was further verified with respect to improved corrosion resistance when compared to conventional grinding methods used for the mirror surface finishing of implant materials in the oral cavity.