| 摘要: |
| H62 黄铜因其良好的加工性能和较好的传热性能，常用于冷凝器的热交换材料，但是在使用过程中易于发生腐蚀。为了进一步提升 H62 黄铜的耐蚀性能，采用电化学剥离的方法成功制备得到锑碳纳米材料，与聚氨酯混合制备得到锑碳 / 聚氨酯复合涂料，通过在 H62 黄铜表面涂装锑碳 / 聚氨酯复合涂料制备锑碳 / 聚氨酯复合涂层，并利用扫描电子显微镜、电化学工作站、浸泡等表征手段探究涂层的表界面形貌和耐蚀性能。结果表明：与聚氨酯涂层相比，锑碳 / 聚氨酯复合涂层在腐蚀测试过程中具有更正的腐蚀电位(?0.209 V)、高阻抗模值和阻抗值(~7.0 kΩ·cm2 )；铜基底表面无明显腐蚀，呈现优异的防护性能。这主要归因于锑碳纳米材料的加入有效地降低了涂层的孔隙率和延缓了腐蚀介质的渗入，从而提高了 Cu 基底的抗腐蚀性能。首次使用有机+无机(乙二醇+硫酸钠)混合电解液成功电解出水溶性锑碳纳米材料，能很好地分散于水性聚氨酯中，在聚氨酯涂层中起到良好的密封和阻隔作用，可为进一步提升 H62 黄铜的耐蚀性提供参考。 |
| 关键词: 锑碳 复合涂层 H62 黄铜 微观组织 耐蚀性能 |
| DOI：10.11933/j.issn.1007-9289.20210615001 |
| 分类号:O646;TB37 |
| 基金项目:国家自然科学基金资助项目(51965020) |
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| Preparation of Sb-C / polyurethane Composite Coating and Its Corrosion Resistance Performance |
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HE Zhongyi1,2, TIAN Yuqin1,2, ZHANG Renhui1,2, XIONG Liping1,2, LI Qiang3
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1.School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013 , China;2.Key Materials Engineering Research Center of Rail Transit in Jiangxi Province,East China Jiaotong University, Nanchang 330013 , China;3.College of Vanadium and Titanium, Panzhihua University, Panzhihua 617000 , China
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| Abstract: |
| H62 brass is often used as the heat exchange material for condenser due to its good process performance and thermal conductivity, however, which is easily corroded during application. In order to further improve the anticorrosion performance of H62 brass, Sb-C nanomaterial is fabricated by using electrochemical exfoliation method, Sb-C/polyurethane composite paint is fabricated by mixture of Sb-C composite and polyurethane, the Sb-C/ polyurethane composite coating is fabricated on H62 brass surface by using Sb-C/polyurethane composite paint, and the surface and interface morphologies and anticorrosion performance of the coating are performed by using scanning electron microscope (SEM), electrochemical station and immersion method. The results exhibit that compared to the polyurethane coating, the Sb-C/ polyurethane composite coating shows more positive potential (?0.209 V), high impedance modulus and coating resistance (~7.0 kΩ·cm2 ). Furthermore, no obvious corrosion is observed at the Cu substrate, revealing the outstanding corrosion resistance. It is attributed to that Sb-C nanomaterial can effectively reduce the porosity and prohibit the penetration of the corrosive medium, which is conducive to enhancing the corrosion resistance. The organic-inorganic mixed electrolytes (ethylene glycol and sodium sulphate) is first innovatively used to fabricate water-solubility Sb-C nanomaterials, which can be evenly dispersed in water-solubility polyurethane and play an important role in sealing and barrier for polyurethane coating, giving a necessary reference for further investigating the anti-corrosion of H62 brass. |
| Key words: spray composite coating exfoliation microstructure anticorrosion property |
