| LI Yueyue,HAI Jizhe,SHAN Chunlong,LI Haije,XU Qingyu,LEI Yueheng.Effect of Electrolyte Aging on TiO2 Nanotube Coating and Its Properties Prepared by Double Anodizing Method[J],54(6):206-216 |
| Effect of Electrolyte Aging on TiO2 Nanotube Coating and Its Properties Prepared by Double Anodizing Method |
| Received:April 10, 2024 Revised:July 03, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.06.019 |
| KeyWord:titanium alloy anodizing TiO2 nanotube coating aging electrolyte micro-morphology |
| Author | Institution |
| LI Yueyue |
College of Mechanical Engineering, Xinjiang University, Urumqi , China |
| HAI Jizhe |
College of Mechanical Engineering, Xinjiang University, Urumqi , China |
| SHAN Chunlong |
Sixth Affiliated Hospital of Xinjiang Medical University, Urumqi , China |
| LI Haije |
College of Mechanical Engineering, Xinjiang University, Urumqi , China |
| XU Qingyu |
College of Mechanical Engineering, Xinjiang University, Urumqi , China |
| LEI Yueheng |
College of Mechanical Engineering, Xinjiang University, Urumqi , China |
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| Abstract: |
| The work aims to modify the surface of titaium alloy by double anodizing method, prepare a TiO2 nanotube coating on the surface of titanium alloy, analyze the composition and value changes of electrolytes after repeated anodizing, and study the effect of electrolyte aging on the properties of the TiO2 nanotube coating. Glycol based electrolyte was anodized multiple times to obtain different aging electrolytes. A TiO2 nanotube coating was prepared on the surface of the pre-treated titanium alloy by two anodizing methods, and the aging of the electrolyte was controlled for 0 h, 10 h and 20 h. Inductively coupled plasma emission spectrometer, ion chromatograph, pH meter and conductivity instrument were used to study the ion concentration, conductivity and pH value of the electrolyte under different aging conditions. The structure, morphology, phase composition, surface wettability, corrosion resistance, mechanical properties and film bonding strength of the TiO2 nanotube coating were characterized and analyzed by scanning electron microscopy, X-ray diffractometer, contact angle measuring instrument, electrochemical workstation and nanoindentation instrument. The cell compatibility of the TiO2 nanotube coating was tested by cultured rat bone marrow mesenchymal stem cells (BMSCs). The anodic oxidation method was used to prepare the electrolyte with different aging time, and the TiO2 nanotube coating was successfully prepared on the surface of the pre-treated titanium alloy. With the increase of aging, the conductivity of the electrolyte decreased to 491 μs/cm2, the pH increased to 8.11, the concentration of fluoride ion decreased, and the concentration of titanium ion increased. With the decrease of current density, the surface morphology of TiO2 nanotubes changed from nanograss shape to open tube top shape, the tube wall thickness increased, and the tube length shortened from 7.0 μm to 4.4 μm. The phase composition did not change; The corrosion resistance, hardness and elastic modulus were all improved. It was worth noting that although the corrosion resistance of the sample coated with TiO2 nanotube was significantly higher than that of the sample without coatings, the increase of electrolyte aging did not significantly improve the corrosion resistance of the sample. The hydrophilicity and bonding strength did not increase continuously with the increase of electrolyte aging, but reached the best when the electrolyte aging was 10 h, which were 15.10° and 0.528 N, respectively. The biocompatibility of the electrolyte at 10 h and 20 h was better than that of the fresh electrolyte. The aging of the electrolyte improved the hydrophilicity of the sample and was more conducive to cell adhesion and growth. In conclusion, in this paper, the electrolyte of different aging is studied systematically, and the overall performance of TiO2 nanotube coating is tested and analyzed comprehensively. First, the composition and numerical changes of the electrolyte during repeated anodizing are recorded, and then the coating performance is significantly improved by adjusting the aging of the electrolyte, but it is worth noting that not all the properties increase with the increase of the aging of the electrolyte. The hardness and elastic modulus of TiO2 nanotubes increase with the increase of electrolyte aging, and the corrosion resistance is only improved slightly. However, the good morphology, hydrophilicity and bonding strength of the TiO2 nanotube coating only appear in the appropriate range of electrolyte aging, and there is no situation that electrolyte aging is proportional to the improvement of coating performance. Therefore, under the condition of electrolyte aging for 10 h, the TiO2 nanotube coating has been significantly improved, and the overall performance is the best. |
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