| LIU Hengyang,ZHANG Lei,SHI Hongwei,SONG Yingwei,HAN Enhou.Preparation and Characterization of Fluorosilane-modified Nano-silica Superhydrophobic and Anti-corrosion Coatings on Aluminium Alloy[J],54(2):202-212 |
| Preparation and Characterization of Fluorosilane-modified Nano-silica Superhydrophobic and Anti-corrosion Coatings on Aluminium Alloy |
| Received:February 01, 2024 Revised:May 16, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.02.017 |
| KeyWord:fluorosilane modification silica superhydrophobicity micro-nano structure stability |
| Author | Institution |
| LIU Hengyang |
CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;School of Materials Science and Engineering, University of Science and Technology of China, Hefei , China |
| ZHANG Lei |
Beijing Aeronautical Engineering Technology Research Center, Beijing , China |
| SHI Hongwei |
CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;School of Materials Science and Engineering, Shenyang University of Technology, Shenyang , China |
| SONG Yingwei |
CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;School of Materials Science and Engineering, University of Science and Technology of China, Hefei , China |
| HAN Enhou |
CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;School of Materials Science and Engineering, University of Science and Technology of China, Hefei , China;Institute of Corrosion Science and Technology, Guangzhou , China |
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| Abstract: |
| Because of its relatively low corrosion potential, aluminum alloy is easily affected by electrochemical corrosion in humid environments. In order to improve the corrosion resistance of aluminum alloy, the organic coating is one of the more economical and effective methods to protect aluminum alloy. However, the function of traditional coatings is single, and it is difficult to meet the service need in complex environments. At present, the preparation of superhydrophobic films on aluminum alloy is considered to be a new and environmentally friendly technology. A durable superhydrophobic coating was prepared on aluminium alloy with hydroxyl acrylic resin 1198, curing agent N75-aliphatic polyisocyanate (hexamethylene-diisocyanate biuret), 1H,1H,2H,2H-perfluorooctane trethoxysilane (PFOTES) and silicon dioxide (SiO2) nanoparticles by simple spraying. Firstly, silica nanoparticles (SiO2-PFOTES) with low surface energy were prepared for constructing a micro-nano structure of superhydrophobic coatings. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to analyze the morphology of SiO2 and the coating surface before and after modification. Fourier transform infrared spectroscopy (FT-IR) was used to test the chemical composition of SiO2 before and after modification in the range of 4 000-450 cm−1. The structure of silica was characterized by X-ray diffraction instrument. The experimental results showed that the silane coupling agent containing double bonds was hydrolyzed to silanol monomer under the action of H+, and the silicone hydroxyl group on the surface of silanol monomer and the silicon hydroxyl group on the surface of silica nanoparticles were dehydrated and condensed to form Si—O—Si bond and grafted on the surface of silica nanoparticles. Then, SiO2-PFOTES was dispersed and added into 1198 resin, and then N75 curing agent was added to obtain super hydrophobic coatings on aluminium alloy. The surface wettability of the material was measured by a contact angle measuring instrument. At the same time, UV aging and salt spray tests were carried out on the SiO2-PFOTES/ PU coating. The experimental results showed that when the ratio of SiO2-PFOTES to PU was 1∶4, the water contact angle of the superhydrophobic coating was 154°, and the sliding angle was less than 5°. The micro-nano structure layer of SiO2-PFOTES could form obvious mastoid micro-nano structure on the surface of the composite coating, so that the coating could achieve super hydrophobic property. In addition, the coating effectively repelled complex mixtures or organic liquids such as milk, canola oil, and dye. The coating still had excellent stability and superhydrophobicity after a UV aging and salt spray test of 20 d. Compared with the salt spray test, the coating properties decreased less after UV aging. In ultraviolet aging, the ultraviolet light energy was large enough to break the chemical bonds in the resin, resulting in aging. The primary oxidation products generated by ultraviolet radiation were unstable, and the reaction further accelerated the aging of the resin. However, the addition of sufficient SiO2-PFOTES constructed a rough surface on the surface of the resin, forming a protective layer. The aging of resin under ultraviolet radiation was delayed. Using PFOTES as modifier and SiO2 nanoparticles as filler, a stable anti-corrosion and superhydrophobic composite coating on aluminium alloy was successfully prepared. It provides a new idea for the design and preparation of superhydrophobic coatings. |
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