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2222材料工程  2021, Vol. 49 Issue (5): 163-170    DOI: 10.11868/j.issn.1001-4381.2019.000850
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
张双红1, 杨波1, 翟伟1, 李爽1, 孔纲2
1. 广州特种承压设备检测研究院, 广州 510663;
2. 华南理工大学 材料科学与工程学院, 广州 510640
Composition and properties of methyl silicate/silicate composite coatings
ZHANG Shuang-hong1, YANG Bo1, ZHAI Wei1, LI Shuang1, KONG Gang2
1. Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou 510663, China;
2. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
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摘要 采用两步法制备甲基硅酸盐/硅酸盐复合膜,通过扫描电子显微镜(SEM)及EDS分析、红外光谱(FT-IR)分析、接触角测试、中性盐雾实验和极化曲线等对膜层的微观形貌、化学组成、疏水性及耐腐蚀性能进行了研究,并与单独的硅酸盐膜、甲基硅酸盐膜进行对比。利用电化学阻抗谱和等效电路拟合分析甲基硅酸盐/硅酸盐复合膜的防腐蚀机理。结果表明:甲基硅酸盐/硅酸盐复合膜层的外层与单独甲基硅酸钠膜的成分含量基本一致,但其微观形貌与单独甲基硅酸盐膜表面布满裂纹不同,复合膜层的表面均匀平整、没有开裂,膜层附着性好。单独硅酸盐膜为亲水性膜层,甲基硅酸盐/硅酸盐复合膜表现出疏水性,与单独硅酸盐膜相比,复合膜对腐蚀的阴极过程的抑制明显增强,极化阻抗增加至单独硅酸盐膜的5倍以上,复合膜的总阻抗值超过100 kΩ·cm2,复合膜的腐蚀电流密度比单独硅酸盐膜的降低了60%。
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关键词 甲基硅酸钠疏水性硅酸盐复合膜耐腐蚀性    
Abstract:Methyl silicate/silicate composite coatings were prepared using a two-step method. The morphology, chemical composition, hydrophobicity and corrosion resistance of the coatings were investigated by scanning electron microscope (SEM) with energy dispersive spectrometer (EDS), Fourier transform infrared spectroscopy (FT-IR), contact angle tests, neutral salt spray (NSS) tests and potentiodynamic polarization curve, respectively, and were compared with those of single silicate coating and methyl silicate coating. The corrosion mechanism of methyl silicate/silicate composite coatings were analysed by electrochemical impedance spectroscopy (EIS) as well as equivalent circuit. The results show that the compositions of methyl silicate/silicate composite coatings outer layer are the almost same as the compositions of single methyl silicate coating, different from single methyl silicate coating with lots of cracks on surface, the composite coatings are uniform and smooth with no crack, and the adhesion is good. Single silicate coating is hydrophilic. Compared with single silicate coating, methyl silicate/silicate composite coating is hydrophobic, corrosion inhibition of cathodic process is obviously enhanced, and polarization impedance of the composite coating is 5 times more than that of the single silicate coating,total impedance values of composite coatings are more than 100 kΩ·cm2, corrosion current density of composite coatings is reduced by 60%.
Key wordssodium methyl silicate    hydrophobicity    silicate composite coating    corrosion resistance
收稿日期: 2019-09-17      出版日期: 2021-05-21
中图分类号:  TB321  
通讯作者: 张双红(1983-),女,工程师,博士,研究方向为材料表面处理和石墨烯防腐蚀应用研究,联系地址:广州市越秀区白云路97号广州特种承压设备检测研究院(510663),     E-mail:
张双红, 杨波, 翟伟, 李爽, 孔纲. 甲基硅酸盐/硅酸盐复合膜的组成和性能研究[J]. 材料工程, 2021, 49(5): 163-170.
ZHANG Shuang-hong, YANG Bo, ZHAI Wei, LI Shuang, KONG Gang. Composition and properties of methyl silicate/silicate composite coatings. Journal of Materials Engineering, 2021, 49(5): 163-170.
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