치과 임플란트용 타이타늄의 표면처리에 따른 부식특성

Abstract

This study evaluated the corrosion characteristics of pure titanium specimens under four surface condi- tions: machined, polished after machining, RBM-treated, and SLA-treated. FE-SEM surface observations showed residual machining debris on the machined surface and parallel scratches on the polished surface, while the RBM-treated surface exhibited irregular depressions of various sizes, and the SLA-treated sur- face revealed a micro-honeycomb structure with nanopores. Surface roughness measurements indicated increasing roughness from 0.27 m on the machined surface and 0.39 m on the polished surface to 1.58 m on the RBM surface and 2.16 m on the SLA surface. According to results of potentiodynamic polarization test, the SLA-treated surface showed the highest corrosion potential (–363 mV) and the low- est corrosion current density (0.87 × 10–9 A/cm2), demonstrating superior corrosion resistance. After thecorrosion test, localized pitting-induced collapse was observed on the machined surface, whereas the pol- ished surface appeared relatively intact. No obvious corrosion regions were detected at low magnification on the RBM and SLA surfaces. EDS elemental mapping revealed that Na and Cl were evenly distributed on the machined and polished surfaces, while distinct NaCl crystalline precipitates were observed on the RBM and SLA surfaces.