【摘要】 目的研究添加装载缓蚀剂的介孔分子筛对环氧涂层防腐蚀性能的影响。方法通过浸渍法分别添加有机缓蚀剂葡萄糖酸锌和无机缓蚀剂硝酸铈对介孔分子筛MCM-41改性获得缓蚀颗粒,将缓蚀颗粒与环氧涂层混合获得具有自修复功能的复合环氧涂层。通过中性盐雾试验、电化学交流阻抗谱和局部电化学交流阻抗谱测试,评价了复合环氧涂层的防腐蚀性能,并通过光学显微镜对腐蚀后形貌进行了观察。结果当缓蚀颗粒含量为5%时,浸泡50 d后,环氧清漆的涂层电阻从9.93×10⁴Ω降至3.71×10⁴Ω,而铈改性复合涂层的电阻从2.33×10⁵Ω降至1.06×10⁵Ω,其变化趋势更稳定且阻抗值更大,有机锌盐改性复合涂层在浸泡后的起泡现象也得到了明显改善。缓蚀颗粒含量较多（10%）时,复合涂层中的微孔缺陷含量增高,同时引起渗透压的改变,使得腐蚀介质更易渗透至金属基体表面,加速腐蚀的发生。在带缺陷涂层中,两种改性涂层缺陷周围测得的阻抗值呈现先减小后增大的趋势,涂层均出现自修复现象。结论适量装载缓蚀剂介孔分子筛颗粒的加入,有效地提高了环氧涂层的防腐蚀性能。Zn²⁺/Ce³⁺在缺陷处形成难溶化合物阻碍腐蚀反应是提高涂层防腐蚀能力的主要原因。更多还原

【Abstract】 To investigate the effect of mesoporous molecular sieve loaded with corrosion inhibitor on the corrosion resistance of epoxy coating,in this paper,corrosion inhibition particles were obtained by adding organic corrosion inhibitor C₁₂H₂₂ZnO₁₄ and inorganic corrosion inhibitor Ce（NO₃）₃ respectively to modify mesoporous molecular sieve MCM-41,and then the obtained corrosion inhibition particles were mixed with the epoxy coating to prepare the composite epoxy coating with self-repairing function.The corrosion resistance of composite epoxy coatings was evaluated by neutral salt spray test,electrochemical impedance spectroscopy （EIS） and local electrochemical impedance spectroscopy （LEIS）,and the surface morphology after corrosion was observed by optical microscope.When the corrosion inhibitor content is 5%,the coating resistance of EV from 9.93×10⁴Ω fell to 3.71×10⁴Ω after immersing for 50 d,while cerium modified composite coating resistance from 2.33×10⁵Ω fell to 1.06×10⁵Ω,indicating that change tendency is more stable.organic zinc salt modified composite coating foaming phenomenon has been obviously improved after immersing.When the corrosion inhibitor content is 10%,the content of microporous defects in the composite coating increases,and meanwhile causes the change of osmotic pressure,which makes the corrosive medium penetrate more easily to the surface of the metal substrate and accelerates corrosion.In the coating with defects,the measured impedance values around the defects of the two kinds of modified coatings tended to decrease first and then increase,and self-repairing phenomena occurred in both coatings.Above all,the addition of mesoporous molecular sieve particles with appropriate amount of corrosion inhibitor can effectively improve the anti-corrosion performance of epoxy coating.Zn²⁺/Ce³⁺ could form insoluble compounds at the defects area resulting the limit of corrosion reaction,which is the main reason for improving the anti-corrosion ability of epoxy coating.更多还原