Construction and Corrosion Resistance of Superhydrophobic Micro-arc Oxidation-hydrothermal-silanization Composite Coatings on Surface of TC4 Titanium Alloy

JIN Jie; XIONG Lifang; YIN Tianchen; HOU Guangfei; SONG Ruoyuan; CHEN Shuangshuang

doi:10.16490/j.cnki.issn.1001-3660.2025.15.017

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Surface Technology ›› 2025, Vol. 54 ›› Issue (15) : 189-199. DOI: 10.16490/j.cnki.issn.1001-3660.2025.15.017

Construction and Corrosion Resistance of Superhydrophobic Micro-arc Oxidation-hydrothermal-silanization Composite Coatings on Surface of TC4 Titanium Alloy

JIN Jie, XIONG Lifang, YIN Tianchen, HOU Guangfei, SONG Ruoyuan, CHEN Shuangshuang^*

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Abstract

In this study, superhydrophobic micro-arc oxidation-hydrothermal-silanization composite coatings are successfully prepared on the surface of TC4 titanium alloy to extend its service life in the marine environment. The titanium alloy is firstly processed via micro-arc oxidation treatment in a weakly alkaline silicate electrolyte system composed of 10 g/L sodium (Na₂SiO₃·9H₂O), 10 g/L sodium hexametaphosphate (Na₆O₁₈P₆) and 1 g/L potassium hydroxide (KOH). Then, a 0.05 mol/L Al(NO₃)₃·9H₂O solution is selected to perform hydrothermal treatment of the micro-arc oxidation treated specimens at different temperature for 2 h. Finally, the micro-arc oxidation-hydrothermal treated specimens are placed in a 0.01 mol/L 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PFOTS)-ethanol solution for silanization treatment for 4 h. The phase compositions, surface morphologies, cross-sectional morphologies, and chemical compositions of the micro-arc oxidation- hydrothermal-silanization composite coatings are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive spectrometer (EDS), and the corrosion resistance and wettability of the composite coatings are tested by electrochemical workstation and contact angle goniometery.

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JIN Jie, XIONG Lifang, YIN Tianchen, HOU Guangfei, SONG Ruoyuan, CHEN Shuangshuang. Construction and Corrosion Resistance of Superhydrophobic Micro-arc Oxidation-hydrothermal-silanization Composite Coatings on Surface of TC4 Titanium Alloy[J]. Surface Technology. 2025, 54(15): 189-199 https://doi.org/10.16490/j.cnki.issn.1001-3660.2025.15.017

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Funding

Natural Science Foundation of Anhui Provincial Education Department (2023AH051111); College Students' Innovative Entrepreneurial Training Program (202410360016); Anhui Province New Era Education Quality Project (2023cxcy sj074, 2024cxcysj076)