Titanium 양극산화시 TiO 2 의 형상 및 특성에 미치는 전해질의 영향

• Published in: Corrosion science and technology Vol. 22; no. 3; pp. 193 - 200
• Main Authors: 최예지, Yeji Choi, 정찬영, Chanyoung Jeong
• Format: Journal Article
• Language: Korean
• Published: 한국부식방식학회 30.06.2023
• Subjects: Anodizing; Corrosion; Electrolyte; Hydrophobic; Ti Nanostructure; Electrolyte; Corrosion; Anodizing; Ti Nanostructure; Hydrophobic
• ISSN: 1598-6462

Titanium alloy (grade-4) is commonly used in industrial and medical applications. To improve its corrosion resistance and biocompatibility for medical use, it is necessary to form a titanium oxide film. In this study, the morphology of the oxide film formed by anodizing Ti-grade 4 using different electrolytes was analyzed. Wetting properties before and after surface modification with SAM coating were also observed. Electrolytes used were categorized as A, B, and C. Electrolyte A consisted of 0.3 M oxalic acid and ethylene glycol. Electrolyte B consisted of 0.1 M NH 4 F and 0.1 M H 2 O in ethylene glycol. Electrolyte C consisted of 0.07 M NH 4 F and 1 M H 2 O in ethylene glycol. Samples B and C exhibited a porous structure, while sample A formed a thickest oxide film with a droplet-like structure. AFM analysis and contact angle measurements showed that sample A with the highest roughness exhibited the best hydrophilicity. After surface modification with SAM coating, it displayed superior hydrophobicity. Despite having the thickest oxide film, sample A showed the lowest insulation resistance due to its irregular structure. On the other hand, sample C with a thick and regular porous oxide film demonstrated the highest insulation resistance.