The hydrophilic benzimidazole@ZIF-8@tannic acid (ZBT) nanoparticles and the pH-responsive modified epoxy (EP) coatings based on ZBT were prepared innovatively. The result exhibited that the ZBT had excellent compatibility with the EP coatings, and the addition of ZBT improved the protective properties of the EP coatings, which were attributed to the formation of the Zn(OH) deposition film, the inhibitor adsorption film and the ferric tannate film on the steel substrate. Meanwhile, the original adhesion and wet adhesion strengths of the ZBT/EP coatings were both enhanced, which was mainly attributed to the enhanced interaction between the ZBT/EP coatings and the carbon steel, and the crosslinking density and the degree of curing of the coatings were also improved. After 173 days of immersion, the impedance value of the ZBT coatings remained at 7.89 × 10 Ω·cm, while the EP coatings decreased to 3.94 × 10 Ω·cm. The wet adhesion loss of EP and ZBT/EP coatings was 63.6 % and 27.1 %, respectively. In the end, the protective mechanism of the ZBT/EP coatings was first proposed.

中文翻译：

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基于BI@ZIF-8@TA的改性环氧涂料，用于长效防腐应用

创新制备了亲水性苯并咪唑@ZIF-8@单宁酸（ZBT）纳米粒子以及基于ZBT的pH响应性改性环氧（EP）涂料。结果表明，ZBT与EP涂层具有良好的相容性，ZBT的添加提高了EP涂层的防护性能，这归因于Zn(OH)沉积膜、缓蚀剂吸附膜和铁离子的形成。钢基材上的单宁酸膜。同时，ZBT/EP涂层的原始附着力和湿附着强度均得到增强，这主要归因于ZBT/EP涂层与碳钢之间相互作用的增强以及涂层交联密度和固化程度的增强。也得到了改善。浸泡173天后，ZBT涂层的阻抗值保持在7.89×10Ω·cm，而EP涂层则下降至3.94×10Ω·cm。 EP和ZBT/EP涂层的湿附着力损失分别为63.6%和27.1%。最后首次提出了ZBT/EP涂层的保护机理。