慕仙莲,张馨月,郁大照,刘元海,刘杰.不同苯并三氮唑(BTA)添加量对BTA@PHVA/PEI环氧涂层防护性能的影响[J].表面技术,2024,53(14):87-95.
MU Xianlian,ZHANG Xinyue,YU Dazhao,LIU Yuanhai,LIU Jie.Effect of Different Benzotriazole (BTA) Additions on Protective Properties of BTA@PHVA/PEI Epoxy Coatings[J].Surface Technology,2024,53(14):87-95 |
| 不同苯并三氮唑(BTA)添加量对BTA@PHVA/PEI环氧涂层防护性能的影响 |
| Effect of Different Benzotriazole (BTA) Additions on Protective Properties of BTA@PHVA/PEI Epoxy Coatings |
| 投稿时间：2023-08-18 修订日期：2023-10-09 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.14.007 |
| 中文关键词: 苯并三氮唑 杂化凝胶 防护性能 环氧涂层 电化学阻抗谱 |
| 英文关键词:benzotriazole hybrid gels protective properties epoxy coatings electrochemical impedance spectroscopy |
| 基金项目:国家自然科学基金(51971192);山东省自然科学基金(ZR2020ME132, ZR2022QE155) |
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| Author | Institution |
| MU Xianlian | Key Laboratory of Structural Corrosion Protection and Control Aviation Technology, China Institute of Special Aircraft, Hubei Jingmen 448035, China |
| ZHANG Xinyue | School of Chemistry and Chemical Engineering, Yantai University, Shandong Yantai 264005, China |
| YU Dazhao | School of Aviation Foundation, Naval Aeronautical University, Shandong Yantai 264000, China |
| LIU Yuanhai | Key Laboratory of Structural Corrosion Protection and Control Aviation Technology, China Institute of Special Aircraft, Hubei Jingmen 448035, China |
| LIU Jie | School of Chemistry and Chemical Engineering, Yantai University, Shandong Yantai 264005, China |
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| 中文摘要: |
| 目的 通过制备装载苯并三氮唑(BTA)的杂化凝胶(BTA@PHVA/PEI)，并将其添加至环氧(EP)涂层中研究不同苯并三氮唑添加量对BTA@PHVA/PEI环氧涂层防护性能的影响。方法 通过自由基聚合法制备BTA@PHVA/PEI，将其添加至环氧涂层中制备BTA@PHVA/PEI环氧复合涂层。通过红外光谱、扫描电子显微镜、热重分析等手段对制备的BTA@PHVA/PEI进行结构表征。在3.5%(质量分数)NaCl溶液中开展模拟海水浸泡试验。对涂层附着力、电化学阻抗谱和涂层腐蚀形貌进行表征分析。结果 成功制备了装载缓蚀剂BTA的杂化凝胶BTA@PHVA/PEI;浸泡300 h后，BP-1/EP涂层、BP-2/EP涂层和BP-3/EP涂层附着力分别下降了55.7%、53.9%和58.2%，明显低于相同条件下EP涂层的附着力损失值(60.4%);在相同条件下，BTA@PHVA/PEI涂层始终具有更高的阻抗值。浸泡300 h后，BTA@PHVA/PEI涂层的阻抗值为3.36×105 Ω∙cm2，比EP涂层阻抗值高1个数量级。结论 BTA@PHVA/PEI中的硅氧烷结构能提高环氧涂层交联密度，降低腐蚀性粒子的渗透速率，使BP/EP涂层具有更高的附着力。在同等实验条件下，BTA@PHVA/PEI环氧涂层的防护效果更优，这主要是因为BTA中N原子的孤电子对与Fe原子的空轨道在金属基体表面形成了吸附膜和PHVA/PEI凝胶的三维网络具有屏蔽作用。 |
| 英文摘要: |
| Heterogeneous gels (BTA@PHVA/PEI) loaded with benzotriazole (BTA) were successfully prepared by free radical polymerization and added to epoxy coatings to prepare BTA@PHVA/PEI epoxy composite coatings. The effect of different benzotriazole additions on the protective properties of BTA@PHVA/PEI epoxy composite coatings was investigated by preparing BTA@PHVA/PEI with different BTA additions. FT-IR, SEM and TG were used to investigate the structural properties of the prepared BTA@PHVA/PEI. The findings revealed that the surface of the PHVA/PEI hybrid gel created a large number of folds and pores due to electrostatic repulsion, which provided space for storing water and loading BTA. The loading of BTA had little effect on the chemical structure of the PHVA/PEI hybrid gel. The loading of BTA in the BTA@PHVA/PEI prepared with different BTA additions was 10.7wt.%, 14.2wt.% and 18.1wt.%, respectively. The prepared coatings (EP coating, BP-1/EP coating, BP-2/EP coating and BP-3/EP coating) were immersed in a 3.5wt.% NaCl solution to simulate seawater immersion tests. Adhesion tests, electrochemical impedance spectroscopy and electron microscopy were used to evaluate and analyze the corrosion resistance of coatings. The results showed that the BTA@PHVA/PEI epoxy coatings had higher adhesion compared with the epoxy coatings due to the siloxane structure in BTA@PHVA/PEI which improved the compatibility of the gel with the organic coating and increased the degree of cure of the epoxy coating. After 14 days of immersion, the adhesion of BP-1/EP coatings, BP-2/EP coatings and BP-3/EP coatings decreased by 55.7%, 53.9% and 58.2%, respectively, which was less than the reduction in adhesion for EP coatings (60.4%). The reason for that while the siloxane structure increased the degree of curing of the epoxy coatings, the N and Zn atoms in the BTA@PHVA/PEI in the BP/EP coatings enhanced the adhesion. At the same immersion time, the BTA@PHVA/PEI coatings always had higher impedance values, while the impedance values of the EP coatings decreased to 5.39×104 Ω∙cm2. The impedance of BP-2/EP remained at 3.36×105 Ω∙cm2 after 300 h of immersion, which was due to the fact that the BTA in BP-2/EP was released to form a corrosion inhibitor film on the surface of the metal substrate and retarded the corrosion of the metal at the coatings defects. The corrosion resistance of the coatings with the addition of BTA was significantly better than that of the EP coatings, which was due to the fact that the corrosion performance of the coating was enhanced by the release of the adsorbed film formed by BTA on the substrate surface by BTA@PHVA/PEI. In summary, heterogeneous condensed BTA@PHVA/PEI loaded with the corrosion inhibitor BTA is successfully prepared; the siloxane structure in PHVA/PEI increases the crosslink density of the epoxy coatings and reduces the permeability of water and corrosion ions, resulting in higher adhesion of the BP/EP coating. Under the same experimental conditions, the protection effect of BTA@PHVA/PEI epoxy coating is superior, which is mainly related to the formation of an adsorption film on the surface of the metal substrate by the lone electron pair of N atoms in BTA with the empty orbitals of Fe atoms, and the formation of a dense barrier on the metal surface by the three-dimensional network structure of PHVA/PEI gel. |
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