Preparation and Anti-corrosion Properties of SiO2/PDMS Super-hydrophobic Coating on Q235 Carbon Steel

被引：0

作者：

Yu Y.-H. ^{[1
]}

Dong Y.-H. ^{[1
]}

Xing J. ^{[1
]}

Chen Y.-M. ^{[1
]}

Ning H.-L. ^{[1
]}

Zhao T. ^{[1
]}

Peng S.-G. ^{[1
]}

机构：

[1] Luoyang Key Laboratory of Industrial Waste Resource Utilization, School of Chemistry and Chemical Engineering, Henan University of Science and Technology, Henan, Luoyang

来源：

Surface Technology | 2023年 / 52卷 / 09期

基金：

中国国家自然科学基金;

关键词：

anti-corrosion; composite coating; polydimethylsiloxane; Q235 carbon steel; SiO[!sub]2[!/sub; super-hydrophobic;

D O I：

10.16490/j.cnki.issn.1001-3660.2023.09.017

中图分类号：

学科分类号：

摘要：

Metal corrosion has brought huge losses to human society, so it is of great significance to study the corrosion and protection of materials. To improve the corrosion resistance of Q235 carbon steel, the work aims to prepare the SiO2/PDMS super-hydrophobic coating on the surface of Q235, and discuss the corrosion resistance and mechanism of the composite coating. In this study, Q235 with a diameter of 13.5 mm and a thickness of 2.0 mm was selected as the metal substrate, and was ultrasonically cleaned by acetone, ethanol and deionized water respectively. Then, the pretreated Q235 was immersed in polydimethylsiloxane (PDMS) dispersion and hydrophobic vapor silica nanoparticles/PDMS dispersion successively, and was pulled at a speed of 1 mm/min to introduce SiO2/PDMS super-hydrophobic composite coating on the surface of Q235. The morphology, microstructure, and surface characteristics were investigated by field emission scanning electron microscope (FESEM, JSM-7610FPlus), confocal laser scanning confocal microscope (CLSM, KEYENCE/VK-X1100), energy dispersive X-ray spectrometer (EDS), contact angle measuring instrument (SDC-100), sandpaper abrasion test, knife scratching and tape stripping test. The anti-corrosion property of the SiO2/PDMS super-hydrophobic coating was evaluated by electrochemical impedance spectrum (EIS) and Tafel polarization curve with 3.5wt.% sodium chloride solution as the corrosive medium. The FESEM, CLSM and EDS characterization results showed that the SiO2/PDMS super-hydrophobic coating had been successfully coated on the surface of Q235, and the surface of Q235 became rough and presented a strewn gully structure after the super-hydrophobic coating modification. The average roughness was 2.2 μm. The surface energy of coating was only 5.6 mJ/m2, the contact angle was 152.6°, and the coating remained super-hydrophobic after 15 cycles of sandpaper wear and 30 cycles of taping and peeling, indicating that the surface of Q235 had excellent super-hydrophobicity. In addition, the EIS results showed that the introduction of SiO2/PDMS super-hydrophobic coating on the surface of Q235 increased the impedance value by two orders of magnitude and decreased the capacitance value by six orders of magnitude. The Tafel curve showed that the corrosion potential of super-hydrophobic coating/Q235 was 0.419 2 V higher than that of the bare Q235, the corrosion current was reduced by three orders of magnitude, and the protection efficiency of the coating could be as high as 99.8%, demonstrating that the coating had excellent corrosion resistance. In addition, the durability test showed that the SiO2/PDMS coating retained super-hydrophobicity and excellent corrosion resistance after a week of immersion in corrosion solution, implying that the SiO2/PDMS coating had good anti-corrosion durability. In conclusion, with PDMS as hydrophobic coating and SiO2 nanoparticles as filler to construct rough surface, a stable SiO2/PDMS super-hydrophobic coating can be prepared on the surface of Q235 by a simple dipping and pulling process. The dense PDMS coating plays a shielding role on the corrosive solution, and its excellent adhesion makes it become the intermediate bridge between the metal substrate and SiO2. The introduction of nano-sized SiO2 makes the surface of Q235 show a rough structure of microscopic convex, and enhances the stability of the system. The synergistic effect of PDMS and SiO2 realizes the transformation from hydrophilic to super-hydrophobic surface of Q235 and improves the corrosion resistance of Q235. This study provides a facile method to construct a robust super-hydrophobic surface on metal surface, which is expected to expand the application of metal in harsh environment. © 2023 Chongqing Wujiu Periodicals Press. All rights reserved.

引用

页码：209 / 219

页数：10

共 43 条

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