Sol–gel method was used to prepare a Si-Ti-epoxy organic–inorganic hybrid composite sol, which was cured on the carbon steel surface at room temperature to obtain a transparent film. Based on the scanning electron microscopic image, the microscopic morphology of the film is flat, smooth, and dense. The atomic force microscopic image shows a nanometer scale morphology, and the structure of the Si-Ti-epoxy hybrid film is more uniform and denser than that of the Si-epoxy hybrid film. The film/carbon steel attenuated total reflection infrared spectrum presents a Si-O-Fe absorption peak at 831 cm⁻¹, which indicates the chemical bonding of the organic–inorganic hybrid film and the carbon steel substrate. The contact angle of the film is greater than 90°, indicating hydrophobicity. The dense nanostructure of the film and the chemical combination with the metal substrate confer the film with excellent electrochemical protection performance. The low-frequency impedance modulus (|Z|_0.01Hz =10¹⁰Ω∙cm²) of the Si-Ti-epoxy hybrid film (15–20μm) is an order of magnitude higher than the double-thick epoxy film (30–35μm). The corrosion current density (10⁻¹¹A/cm²) obtained by the polarization curve is two orders of magnitude lower than the double-thick epoxy film.

溶胶-凝胶法用于制备Si-Ti-环氧有机-无机杂化复合溶胶，在室温下将其固化在碳钢表面上以获得透明膜。基于扫描电子显微图像，膜的显微形态是平坦，光滑和致密的。原子力显微镜图像显示了纳米尺度的形态，并且Si-Ti-环氧树脂杂化膜的结构比Si-环氧树脂杂化膜的结构更均匀且致密。膜/碳钢衰减的全反射红外光谱在831 cm ^-1处出现Si-O-Fe吸收峰，表明有机-无机杂化膜与碳钢基底之间的化学键合。薄膜的接触角大于90°，​​表明具有疏水性。薄膜的致密纳米结构以及与金属基材的化学结合使薄膜具有出色的电化学保护性能。低频阻抗模量（| Z | _0.01赫兹= 10 ¹⁰ Ω∙厘米²）中的Si-Ti系环氧杂化膜（15-20μm）的是一个数量级而不是双厚环氧树脂膜高（30- 35μm）。通过极化曲线获得的腐蚀电流密度（10 ^-11 A / cm ²）比双层环氧膜低两个数量级。