아-크 이온플레이팅법으로 TiN과 ZrN코팅된 어버트먼트나사의 표면특성

Abstract

The purpose of this study was to investigate the surface characteristics of TiN and ZrN coated abutment screw by using arc-ion plating method(AIP). Abutment screw(Internal, Shinheung, Co) was prepared and used for various experiment; AIP coating, potentiodynamic test, and AC impedance test. TiN and ZrN film was coated on the abutment screw using AIP, respectively. The coated surface was investigated by field-emission scanning electron microscope(FE-SEM), energy dispersive x-ray spectroscopy(EDS), surface roughness tester at the screw top, flank and valley of abutment screw. The electrochemical behavior of TiN and ZrN coated surface was investigated by using potentiodynamic and AC impedance method in 0.9% NaCl solution at 36.5 ± 1℃. After electrochemical test, morphology of surface was observed by FE-SEM. The results were as follows:

1. The surface of TiN and ZrN coated abutment screw showed the smooth surface without mechanical defects like a scratch formed by manufacturing process compared to non-coated abutment screw.

2. The corrosion potentials of TiN and ZrN coated abutment screw were higher than those of non-coated abutment screw, whereas current densities of TiN and ZrN coated abutment screw were lower than those of non-coated abutment screw.

3. Polarization resistances(Rp) of TiN and ZrN coated abutment screw were higher than those of non-coated abutment screw. The slope of Bode plot was -1 and capacitance characteristics of coated film appeared in coated abutment screw.

It is considered that the TiN and ZrN coating on the abutment screw by AIP method decreased the surface roughness and kept the stable coated film in corrosive environment, and confirmed that AIP can be applicated to abutment screw for solving the loosening problem of implant system.