In this study, titanate nanotubes (TNTs) were prepared through the hydrothermal method and then modified with γ-aminopropyltriethoxysilane (KH550) to obtain KTNTs with good dispersion properties. A KTNT–waterborne polyurethane (WPU) composite coating was prepared by blending KTNTs with WPU. Fourier transform infrared spectroscopy was used to characterize TNT compositions before and after modification. Thermogravimetric analysis and electrochemical impedance spectroscopy were used to test the thermal stability and corrosion resistance of the composite coating. The results showed that KH550 was successfully connected to the TNT surface. This improved the thermal stability and corrosion resistance of the KTNT–WPU coatings. The fastest thermal decomposition rate for the 0.5% KTNT composite coating was 2%/min lower than that of the pure WPU coating. At the same time, the impedance of the composite coating could reach 7.58 × 10⁷ Ω cm², the corrosion current density was 3.20 × 10⁻⁹ A/cm² and the corrosion inhibition rate reached 99.87%. The composite coating had an effective corrosion protection time of 120 h, and the protective effect of the coating weakened when the immersion time exceeded 360 h.

中文翻译：

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KTNT水性聚氨酯涂料的制备及耐蚀性

本研究采用水热法制备钛酸纳米管（TNTs），然后用γ-氨基丙基三乙氧基硅烷（KH550）对其进行改性，得到具有良好分散性能的KTNTs。通过将 KTNT 与 WPU 共混制备 KTNT-水性聚氨酯 (WPU) 复合涂层。傅立叶变换红外光谱用于表征改性前后的 TNT 成分。采用热重分析和电化学阻抗谱测试了复合涂层的热稳定性和耐蚀性。结果表明，KH550成功连接到TNT表面。这提高了 KTNT-WPU 涂层的热稳定性和耐腐蚀性。0.5% KTNT 复合涂层的最快热分解速率比纯 WPU 涂层低 2%/min。⁷  Ω cm ^{2 时}，腐蚀电流密度为3.20×10 ^-9  A/cm ²，缓蚀率达到99.87%。复合涂层的有效腐蚀防护时间为120 h，浸泡时间超过360 h时涂层的防护作用减弱。