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| 引用本文: | 樊小强,陈仕鹏,黄宇,蔡猛.玄武岩&聚脲复合纤维增强水性环氧树脂涂层的磨/蚀性能[J].中国表面工程,2024,37(5):102~111 |
| FAN Xiaoqiang,CHEN Shipeng,HUANG Yu,CAI Meng.Composite Basalt & Polyurea Fiber as A Reinforced Skeleton to Enhance the Wear-corrosion Performance of Water Epoxy Coating[J].China Surface Engineering,2024,37(5):102~111 |
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| 玄武岩&聚脲复合纤维增强水性环氧树脂涂层的磨/蚀性能 |
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樊小强1，2，陈仕鹏3，黄宇1，蔡猛1
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1.西南交通大学材料科学与工程学院 成都 610031 ；2.西南交通大学材料先进技术教育部重点实验室 成都 610031 ；3.中国工程物理研究院电子工程研究所 绵阳 621900
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| 摘要: |
| 高性能树脂涂装于装备，保障其在多变环境与工况下全寿命周期高功效服役。然而，传统水性环氧树脂涂层固化特性及工艺引起的内部微缺陷现象会导致涂层快速丧失对结构件的长期保护作用，难以满足涂装防护的防腐耐磨需求。对此，综合聚脲纳米纤维和玄武岩纤维的结构与性能优势，利用聚合物原位生长技术在玄武岩纤维表面均匀包覆聚脲纳米纤维，成功研制玄武岩&聚脲复合纤维，并与环氧树脂共混得到复合涂层。依据摩擦学、力学和耐候性能等典型服役参数测试结果，分析复合纤维对水性环氧涂层防护性能的强化模式和作用机理。相比于单一玄武岩纤维树脂涂层，复合纤维涂层在 3.5wt.% NaCl 溶液中浸泡 72 h 后涂层阻抗值提升了近 35 倍，盐雾试验 21 d 后表面状态完整无明显腐蚀现象。同时，凭借玄武岩纤维的强化作用，玄武岩纤维承载了摩擦副的交变应力，吸收了涂层变形过程中的能量，复合纤维涂层磨痕宽度降低约 200 μm，磨损率降低约 78%。研究成果验证了纤维 / 环氧树脂复合体系解决水性环氧涂层“磨-蚀”问题的可行性，可为进一步优化纤维 / 环氧树脂复合涂层制备工艺、探究纤维位向分布对复合涂层综合性能影响规律及强化机理奠定基础。 |
| 关键词: 纤维 环氧树脂 复合物 摩擦磨损 |
| DOI：10.11933/j.issn.1007-9289.20231222001 |
| 分类号:TG174 |
| 基金项目:国家自然科学基金（52075458，U2141211） |
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| Composite Basalt & Polyurea Fiber as A Reinforced Skeleton to Enhance the Wear-corrosion Performance of Water Epoxy Coating |
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FAN Xiaoqiang1，2，CHEN Shipeng3，HUANG Yu1，CAI Meng1
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1.School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031 , China ；2.Key Laboratory of Advanced Technologies of Materials of Ministry of Education, Southwest JiaotongUniversity, Chengdu 610031 , China ；3.Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900 , China
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| Abstract: |
| As an important supporting structure in wind power equipment, the tower plays a key role in supporting the continuous work of the motor and blades. However, the security risks, maintenance and renewal costs of the tower surface can increase sharply because of corrosion and wear. Organic coatings have been regarded as the most economical and convenient means by which to protect towers from corrosion. Among various coatings, waterborne epoxy resin coating is widely used because it is inexpensive and environmentally friendly. However, micropores and microcracks are usually generated due to the solvent evaporation process, which presents both a path for corrosion medium diffusion and a source of crack initiation and propagation. To address the above issue, various fillers have been introduced into waterborne epoxy resin coating to enhance its comprehensive properties. Among fibrous materials, basalt fiber has several excellent physical and chemical properties, such as excellent chemical stability, radiation resistance, mechanical properties, and low cost. Moreover, its preparation process is less harmful to the environment, and it is a veritable green material. However, adding basalt fibers into epoxy resin coating could lead to the formation of microdefects at the interface between the fibers and the coating due to their large size. Therefore, it is necessary to regulate the surface state of basalt fiber to resolve the incompatibility between the basalt fiber and coating. Hence, in this work, composite fibers (PU@BF) were prepared via in-situ polymer growth technology on the surface of basalt fibers by utilizing the structural and property advantages of polyurea nanofibers (PU) and basalt fibers (BF). Then, PU@BF was introduced into waterborne epoxy resin coating (EP) to prepare a fiber-based composite coating, and the tribological properties and corrosion resistance performance were investigated in depth. The scanning electron microscope results indicated that basalt fibers were uniformly covered by polyurea. The storage modulus values of all composite coatings showed a decreasing trend with increasing temperature, as increasing temperature leads to the accelerated movement of chemical bond chain segments as well as polymer segments. Hence, the coating gradually transitions from a highly elastic state to a viscous state. The storage moduli of EP, PU, BF, and PU@BF at 40 ℃ were 1 445, 1 460, 1 688, and 1 526 MPa, respectively, indicating that the mechanical performance of the composite coating was improved via the introduction of fibers. The friction factor of PU@BF was kept between 0.1–0.2, whereas that of EP was approximately 0.8, demonstrating that the introduced composite fibers had a great antifriction effect. The wear rate of PU@BF was 1.2×10?5 mm3 / (N·m), which was decreased by about 78% compared with that of EP (5.5×10?5 mm3 / (N·m)). The Rc value of PU@BF was 2.5 MΩ·cm2 , whereas that of EP was 0.08 MΩ·cm2 , indicating that PU@BF displayed better anticorrosion performance. Neutral salt spray test results showed that black-gray corrosive pitting was observed on the surface of an Al substrate only after 1 week of test, and the corrosion degree was increased after 3 weeks. However, the surface of an Al substrate of PU@BF was still bright and clean without corrosion, indicating that PU@BF had excellent protection performance. The enhanced antiwear / corrosion performance of PU@BF could be attributed to two reasons. First, the polyurea on the surface of the basalt fiber could reduce the microdefects between basalt fibers and epoxy resin to enhance the interfacial adhesion with epoxy molecules and thereby delay the diffusion of corrosion media during immersion. Second, the surface composite fiber layer can bear the vertical pressure and radial cutting force of the friction pair when the composite is subjected to a reciprocating force, and the inner composite fibers can reduce the deformation of the epoxy by exerting a pinning effect and thereby restricting the initiation and propagation of microcracks during friction. This research verifies the feasibility of a fiber / epoxy composite system to solve the “wear and corrosion” problem of waterborne epoxy coating. The results lay a foundation for the further optimization of the fiber / epoxy composite coating preparation process by exploring the influence law of the fiber orientation distribution on the comprehensive performance of a composite coating and its strengthening mechanism. |
| Key words: fibers epoxy resins composite friction and wear |
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