Effects of high concentration of Benzotriazole on corrosion behavior of nanostructured titania-alumina composite coating deposited on Al 2024 by sol-gel method

被引:28
作者
Sharifiyan, Maryam Sadat [1 ]
Shanaghi, Ali [1 ]
Moradi, Hadi [1 ]
Chu, Paul K. [2 ]
机构
[1] Malayer Univ, Mat Engn Dept, Fac Engn, Malayer, Iran
[2] City Univ Hong Kong, Dept Phys & Mat Sci, Tat Chee Ave, Kowloon, Hong Kong, Peoples R China
关键词
Nanostructured titania-alumina coating; Benzotriazole; Corrosion behavior; Al; 2024; Sol-gel method; THIN-FILM; THERMAL-EXPANSION; MILD-STEEL; PROTECTION; INHIBITOR; BENZIMIDAZOLE; PERFORMANCE; DERIVATIVES; COPPER;
D O I
10.1016/j.surfcoat.2017.04.041
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Nanostructured titania-alumina coatings containing 1.2%, 3.6%, and 4.8% Benzotriazole as the self-healing agent are deposited on Al 2024 by the sol-gel method and dip coating. The phase composition and surface morphology are evaluated by XRD, FE-SEM, and AFM and the corrosion behavior is examined by electrochemical impedance spectroscopy and polarization tests in 3.5% NaCI solution for different immersion time periods of 1, 48, and 96 h. Uniform, homogeneous, and crack-free coatings with a thickness of about 3 pm are obtained. Release of Benzotriazole from the coatings blocks active sites and produces a barrier layer to improve the corrosion resistance of Al 2024. A protection efficiency of 76% is observed from the titania-alumina coating with 3.6% Benzotriazole and investigation of the impedance with immersion time confirms the self-healing behavior. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:36 / 44
页数:9
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