Vapor phase assembly of benzotriazole and octadecylamine complex films on aluminum alloy surface
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Vapor phase assembly of benzotriazole and octadecylamine complex films on aluminum alloy surface Hong-Liang Zhang, Da-Quan Zhang, Li-Xin Gao, Yan-Yan Liu, Hong-Bin Yan, Shi-Li Wei, Teng-Fei Ma
Ó American Coatings Association 2020 Abstract The complex films of benzotriazole and octadecylamine have been prepared on the surface of aluminum alloy via vapor phase self-assembly method. Their anticorrosion and wettability are investigated by the electrochemical measurements and the contact angle tests. It shows that the complex films have a better protection effect on aluminum alloys compared with the single component films. The performance of the complex films is related to the sequence of vapor phase self-assembly. The formation mechanism of the different complex films is discussed based on the self-assembly sequence. Keywords Aluminum, Vapor phase self-assembly, Electrochemical measurement, Hydrophobicity, Anticorrosion
Introduction Aluminum alloys are widely used in the automotive industry for construction of parts, such as radiators, inner body panels, and the engine.1,2 Corrosion has been identified as one of the main reasons resulting in the failure of aluminum alloy in environmental medium.3,4 Self-assembled monolayers/multilayers (SAMs) provide a method to spontaneously organize the ordered patterns or structures on material surface. H.-L. Zhang, D.-Q. Zhang (&), L.-X. Gao, Y.-Y. Liu, T.-F. Ma Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China e-mail: [email protected] H.-L. Zhang, H.-B. Yan, S.-L. Wei, T.-F. Ma Suzhou Keysun New Material Technology Co. Ltd., Jiangsu 215138, China
Because of their fast film formation, few defects, high coverage, and low cost, they have received attention from many industries.5,6 SAMs have already been widely applied in surface modification of materials including control of wetting and adhesion, improvement of corrosion resistance, and enhancement of biocompatibility.7,8 Traditionally, SAMs are produced by immersing a substrate into the assembling solution. Yang et al.9 demonstrated that SAMs from assembly solution containing octadecanethiol and benzotriazole have effective protection against copper corrosion. Wen et al.10 fabricated SAMs on aluminum alloy 6061 surface by immersing specimens in dodecafluoroheptyl-propyl-trimethoxysilane solution at three different temperatures, showing that the SAMs improve the corrosion resistance property of Al alloy significantly. We investigated the influence of oxygen and oxidant in the solution on protection of cysteine SAMs for copper. The increase in the dissolved oxygen concentration in the assembly solution improves the protection of Cu surfaces by Cys SAMs.11 In some cases, SAMs formed from the vapor phase are attractive due to their convenience and decreased pollution. Alarcon et al.12 reported the preparation of thiol SAMs on Au(111) and InP(110) from the vapor phase. The process includes the solid 1,4-benzenedimethanethiol b
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