Abstract The covalent conjugation between the phases of organic-inorganic nanocomposites and the careful tuning of the proportion of the colloidal precursors are essential to yield homogeneous, cross-linked and dense coatings that are able to protect metallic alloys against corrosion. In this work, the sol-gel route was used to prepare organic-inorganic hybrid coatings based on poly(methyl methacrylate) (PMMA) covalently bonded to TiO2 or ZrO2 nanoparticles through the coupling agent 2-hydroxyethyl methacrylate (HEMA), applied for the first time as anticorrosive coatings for metallic alloy. Different formulations of the hybrids were prepared by varying the proportion of titanium isopropoxide or zirconium propoxide, methyl methacrylate and benzoyl peroxide, and applied on carbon steel by dip-coating. The optimized parameters yielded for the two hybrids transparent and homogeneous coatings, with a thickness less than 3 μm, low surface roughness ( 200 °C). Electrochemical impedance spectroscopy assays showed that PMMA-ZrO2 and PMMA-TiO2 coatings exhibit corrosion resistance up to 10 GΩ cm2, 7 orders of magnitude higher than the bare carbon steel, remaining essentially unchanged for PMMA-TiO2 during 14 days exposure to 3.5 % saline solution. The results suggest that PMMA-ZrO2 and PMMA-TiO2 nanocomposites are suitable for application as environmentally compliant highly efficient anticorrosive coatings.

中文翻译：

---

PMMA-TiO2和PMMA-ZrO2保护涂层的对比研究

摘要 有机-无机纳米复合材料相之间的共价共轭和胶体前体比例的仔细调整对于产生能够保护金属合金免受腐蚀的均匀、交联和致密的涂层至关重要。在这项工作中，溶胶-凝胶路线用于制备基于聚（甲基丙烯酸甲酯）（PMMA）通过偶联剂甲基丙烯酸 2-羟乙酯（HEMA）共价键合到 TiO2 或 ZrO2 纳米颗粒的有机-无机杂化涂层，应用于首次作为金属合金的防腐涂料。通过改变异丙醇钛或丙醇锆、甲基丙烯酸甲酯和过氧化苯甲酰的比例制备了不同配方的杂化物，并通过浸涂将其涂在碳钢上。两种混合透明和均匀涂层的优化参数，厚度小于 3 μm，表面粗糙度低 (200 °C)。电化学阻抗谱分析表明，PMMA-ZrO2 和 PMMA-TiO2 涂层的耐腐蚀性能高达 10 GΩ cm2，比裸碳钢高 7 个数量级，在暴露于 3.5% 盐水溶液 14 天期间，PMMA-TiO2 基本保持不变. 结果表明 PMMA-ZrO2 和 PMMA-TiO2 纳米复合材料适用于作为符合环保要求的高效防腐涂料。比裸碳钢高 7 个数量级，在暴露于 3.5% 盐水溶液 14 天期间，PMMA-TiO2 基本保持不变。结果表明 PMMA-ZrO2 和 PMMA-TiO2 纳米复合材料适用于作为符合环保要求的高效防腐涂料。比裸碳钢高 7 个数量级，在暴露于 3.5% 盐水溶液 14 天期间，PMMA-TiO2 基本保持不变。结果表明 PMMA-ZrO2 和 PMMA-TiO2 纳米复合材料适用于作为符合环保要求的高效防腐涂料。