| BAO Jihua,ZHANG Haoran,WANG Zhihao,WU Peng,SONG Liying,JIANG Quantong,MA Fubin.Multifunctional Halloysite Nanotube Anti-corrosion Superhydrophobic Self-healing Coating[J],54(8):74-83, 135 |
| Multifunctional Halloysite Nanotube Anti-corrosion Superhydrophobic Self-healing Coating |
| Received:June 05, 2024 Revised:August 01, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.08.006 |
| KeyWord:alkali-etched halloysite nanotubes benzotriazole octadecyltrimethoxysilane superhydrophobic self-healing coating |
| Author | Institution |
| BAO Jihua |
Shandong University of Science and Technology, Shandong Qingdao , China |
| ZHANG Haoran |
Shandong University of Science and Technology, Shandong Qingdao , China |
| WANG Zhihao |
Shandong University of Science and Technology, Shandong Qingdao , China |
| WU Peng |
Shandong University of Science and Technology, Shandong Qingdao , China |
| SONG Liying |
Shandong University of Science and Technology, Shandong Qingdao , China |
| JIANG Quantong |
Institute of Oceanology Chinese Academy of Sciences, Shandong Qingdao , China |
| MA Fubin |
Institute of Oceanology Chinese Academy of Sciences, Shandong Qingdao , China |
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| Abstract: |
| At present, coating technology is widely used in metal corrosion protection. For traditional anticorrosive coatings, when the coating is damaged due to external interference, the bare metal matrix at the scratch will be corroded, and the corrosive substances attached to the surface of the coating will also accelerate the failure of the coating to a certain extent, resulting in metal corrosion. In this paper, a self-healing anticorrosive coating with superhydrophobic ability is prepared with alkali-etched nanotubes (HNTs) modified with corrosion inhibitor benzotriazole (BTA) and octadecyl trimethoxysilane (OTMS) as nano-filler. The comparison of BTA, HNTs and HNTS-BTA by Fourier transform infrared spectroscopy (FTIR) confirms that HNTs successfully load the corrosion inhibitor BTA, and the comparison of HNTS-BTA and OTMS-HNTS-BTA confirms that OTMS is successfully added to the outer surface. The successful loading of BTA and the coating of OTMS are proved by thermogravimetric analysis (TGA). The water contact angle of the OTMS-HNTs-BTA coating is 153°, while that of the HNTs-BTA coating is 103° and that of the blank coating is 77°. It is proved that the OTMS-HNTs-BTA coating has super hydrophobic properties and friction experiments show that the coating has certain wear resistance. Electrochemical impedance (EIS) is used to analyze the self-healing ability of the coating. When the coating is scratched, the HNTs at the scratch are damaged, and the corrosion inhibitor BTA is released and bonded with the copper matrix through strong electrochemisorbed to form a protective film. By analyzing the impedance mode value of the self-healing coating, the self-healing ability of the coating reaches the maximum on the 6th day. The impedance data of the experiment are fitted with ZSimpWin, and the self-healing ability of the coating is confirmed. By observing the surface morphology of HNTs-BTA and OTMS-HNTS-BTA, it can be seen that the morphology and structure of Halloysite nanotubes are not changed after alkali etching and surface modification, and a thin film is formed on the outer surface after OTMS modification. According to SEM and EDS tests, the content of copper in the scratches of the repaired coating is significantly reduced. When scratches are produced, the content of copper is about 72.9%, while when soaked in 3.5wt.% NaCl solution for 6 d, the content of copper in the scratches is reduced to 3.4%, indicating that the scratches are successfully repaired. The coating release inhibitor successfully covers the metal surface to form a protective film. The scanning Kelvin probe (SKP) test finds that the potential valley at the scratch gradually decreases with time and disappears at the 6th day, indicating that the scratch is repaired by the corrosion inhibitor, and the repair effect reaches the best at the 6th day. By alkali etching of alloxite nanotubes, loading corrosion inhibitor BTA and surface modification on the outer surface of alloxite using OTMS, the modified alkali-etched alloxite nanotubes with corrosion inhibitor are blended with epoxy resin. The prepared OTMS-HNTs-BTA coating can effectively prevent the adhesion of corrosive substances and has self-healing ability when the coating is damaged, which can effectively protect the metal surface and extend the service life of the coating. |
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