目的 在TC4钛合金表面构筑超疏水微弧氧化-水热-硅烷复合涂层,以延长它在海洋环境中的使用寿命。方法 先在硅酸盐电解液体系中对合金进行微弧氧化表面处理,接着选用Al(NO3)3·9H2O溶液对微弧氧化样品进行水热处理,最后将其放入1H,1H,2H,2H-全氟辛基三氯硅烷（PFOTS）-乙醇溶液中进行硅烷化处理。借助XRD、SEM、EDS表征复合涂层的物相组成、表面形貌、截面形貌及化学成分,并利用电化学工作站和接触角测量仪测试涂层的耐蚀性和润湿性。结果 微弧氧化-水热-硅烷复合涂层主要由锐钛矿和金红石型TiO2、Al(OH)3相构成。当水热温度达到160 ℃时,复合涂层的水接触角为158.3°,达到超疏水状态,它在模拟海水环境中的腐蚀电流密度（9.89×10-9 A/cm2）最小。复合涂层在离子溶液和碱性环境中分别保持超疏水性4 h和 6 h。经过240 h的紫外线辐照后,复合涂层保持了超疏水特性。结论 微弧氧化-水热-硅烷复合表面处理可以显著改善TC4合金在模拟海洋环境中的耐蚀性。经水热反应生成的Al(OH)3能够封闭大部分微弧氧化涂层表面的孔洞,减少Cl-等强腐蚀性离子从涂层/基体界面进入合金内部。此外,复合涂层表面疏水特性使得涂层与腐蚀液之间形成了“空气膜”,阻隔了腐蚀介质与涂层的直接接触。
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.
关键词
钛合金 /
微弧氧化 /
水热处理 /
硅烷化 /
超疏水 /
耐蚀性
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基金
安徽省高等学校科学研究重点类项目（2023AH051111）; 大学生创新创业训练计划（202410360016）; 安徽省新时代育人质量工程项目（2023cxcy sj074,2024cxcysj076）
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