期刊
CHEMICAL ENGINEERING JOURNAL
卷 404, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127106
关键词
AZ31B alloy; Superhydrophobic; Self-healing; Magnesium silicate nanotubes; 2-Mercaptobenzimidazole
资金
- National Natural Science Foundation of China [21676169, 21978182]
- Institute of New Energy and Low Carbon Technology of Sichuan University
- Ceshigo Research Service
- Engineering Teaching Center, School of Chemical Engineering, Sichuan University
In this study, superhydrophobic dual-function coatings were successfully prepared for the first time, exhibiting self-healing anti-corrosion properties and excellent water repellency when coated on AZ31B Mg alloy substrate. Through systematic investigation, these coatings demonstrated stable physicochemical properties and substantial improvement in long-term anti-corrosion performance.
In this work, clinochrysotile-like magnesium silicate nanotubes (MS-TNs) were fabricated by a hydrothermal method and then modified with dodecyltrimethoxysilane (DTMS) for the first time to act as a superhydrophobic material (MS-TNs/DTMS), whilst the MS-TNs was used as a nanocontainer to load a corrosion inhibitor 2-mercaptabenzimidazole (2-MBI). Taking the advantage of epoxy resin as a coating matrix, the AZ31B Mg alloy substrate was coated successfully by MS-TNs(2-MBI) as the first layer (for self-healing anti-corrosion) and superhydrophobic MS-TNs/DTMS as the second layer (for superhydrophobicity and anti-corrosion). The wettability, functionality and physicochemical stability of the superhydrophobic surface as well as the anticorrosion performances of the dual-function coatings were systematically investigated by characterization, testing and electrochemical measurements. The as-prepared dual function coating with water contact angle at about 155 degrees and sliding angle at circa 5 degrees not only showed robust mechanical stability and chemical durability, but also exhibited substantial improvement of anti-corrosion property for protection of AZ31B Mg in a long run. The corrosion current density decreased from 8.33 x 10(-4) A.cm(2) of bare Mg to 8.12 x 10(-8) A.cm(2) of the coated sample. Furthermore, MS-TNs/DTMS was applicable to various kinds of substrates (e.g., copper mesh, sponge, glass slide, cloth, A4 typing paper) and showed an excellent water repellency, demonstrating its potential usage in fabrication of superhydrophobic surface as a low-cost and environmentally-benign material.
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