Coating of Ti-Ni Shape Memory Alloy for Dental Implants with a Titanium Passivation Film by Ion Beam Mixing

Abstract

Ion beam mixing was used to coat a Ti-Ni alloy substrate with Ti⁺ implant and co-evaporated Ti metal to prevent Ni dissolution. The corrosion resistivity of the Ti-coated substrate was evaluated using an anodic polarization technique. The experimental results suggested that this coating could effectively improve the corrosion resistance of the Ti-Ni alloy even under severe conditions simulating an actual medical operation. The cytotoxity of Ti-coated Ti-Ni disks were evaluated using L-929 cells cultured on a millipore filter medium. The disks were found to be inert to the cells.