[논문]Titanium 양극산화시 TiO2 의 형상 및 특성에 미치는 전해질의 영향

최예지; 정찬영

doi:10.14773/cst.2023.22.3.193

Titanium 양극산화시 TiO2 의 형상 및 특성에 미치는 전해질의 영향
Influence of Electrolyte on the Shape and Characteristics of TiO2 during Anodic Oxidation of Titanium 원문보기

Corrosion science and technology, v.22 no.3, 2023년, pp.193 - 200

Abstract ▼ AI-Helper

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 NH4F and 0.1 M H2O in ethylene glycol. Electrolyte C consisted of 0.07 M NH4F and 1 M H2O 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.

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표/그림 (11)

그림 Fig. 1. (a) Bare titanium surface of contact angle (CA), wettability of roughness surface (b) Wenzel model, (c) Cassie-Baxter model
그림 Fig. 2. A schematic diagram of oxide film morphology formed with anodizing electrolyte
그림 Fig. 3. FE-SEM image (top and cross view) of oxide film formed with anodizing electrolyte
그림 Fig. 4. Result of EDS component analysis of oxide film formed with anodizing electrolyte
그림 Fig. 5. Surface roughness of oxide films formed with anodizing electrolyte
표 Table 1. As a result of eds component analysis, the element content of the oxide film formed with anodizing electrolyte ('Bare' is untreated titanium)
표 Table 2. Insulation resistance measurement results, resistance values of untreated titanium and oxide films formed by different types of anodizing electrolytes
그림 Fig. 6. Water contact angle on untreated titanium (Bare) and oxide films formed by different types of anodizing electrolytes before and after coating
표 Table 3. R_a Values depending on the surface roughness of oxide film
표 Table 4. Contact angle and contact hysteresis angle of water on untreated titanium and oxide films formed by different types of anodizing electrolytes before and after coating
그림 Fig. 7. Shape of pores depending on the surface area of oxide film

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