Chen Bo, Zhou Chengliang, Xiong Wentao, Peng Jie, Luo Xiaohu, Pan Xinyu, Liu Yali
School of Chemistry and Environment, Jiaying University, Meizhou, Guangdong 514000, P. R. China; State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, P.R. China.
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, Hunan 410004, China.
J Colloid Interface Sci. 2025 Jan 15;678(Pt A):742-756. doi: 10.1016/j.jcis.2024.08.164. Epub 2024 Aug 28.
Aluminum and its alloys have been widely used in our lives. However, Aluminum and its alloys is prone to corrosion, especially in harsh environment. In recent years, hydrophobic coatings were used in the corrosion protection of metal. But, the low surface tension of resins made them have a worse wettability on metal which had high surface tension, resulting in a worse adhesion of these coatings. Herein, we developed a long-lasting anti-corrosion direct-to-metal polyurethane NP-Glide coating based on the coordination effect of polyphenol and dual cross-linking. In comparative evaluation, the corrosion protection and anti-contamination performances of direct-to-metal polyurethane NP-Glide coating are significantly improved by the introduction of functional monomer dopamine methacrylamide (DMA) and TEMAc-8. The PU coatings with 10 wt% TEMAc-8 possesses high impedance value (|Z| > 10 Ω•cm) after 40 days of immersion in 3.5 wt% NaCl solution, exhibiting a great pull-off adhesion both in dry and wet coating, and a long-term anti-corrosion performance for aluminum alloy protection.
铝及其合金在我们的生活中已得到广泛应用。然而，铝及其合金易于腐蚀，尤其是在恶劣环境中。近年来，疏水涂层被用于金属的腐蚀防护。但是，树脂的低表面张力使其在具有高表面张力的金属上润湿性较差，导致这些涂层的附着力较差。在此，我们基于多酚和双重交联的配位效应开发了一种长效防腐的直接涂覆金属的聚氨酯NP-Glide涂层。在对比评估中，通过引入功能性单体多巴胺甲基丙烯酰胺（DMA）和TEMAc-8，直接涂覆金属的聚氨酯NP-Glide涂层的防腐和抗污染性能得到显著改善。含有10 wt% TEMAc-8的聚氨酯涂层在3.5 wt% NaCl溶液中浸泡40天后具有高阻抗值（|Z| > 10 Ω•cm），在干涂层和湿涂层中均表现出良好的附着力，并且对铝合金具有长期防腐性能。
