Corrosion behavior of functionally graded and self-healing nanostructured TiO2-Al2O3 Benzotriazole coatings deposited on AA 2024-T3 by the sol-gel method

被引：24
作者：
Simbar, Ali Reza [1 ]
Shanaghi, Ali [1 ,2 ]
Moradi, Hadi [1 ]
Chu, Paul K. [2 ]
机构：
[1] Malayer Univ, Fac Engn, Mat Engn Dept, Malayer, Iran
[2] City Univ Hong Kong, Dept Biomed Engn, Dept Mat Sci & Engn, Dept Phys,Kowloon, Tat Chee Ave, Hong Kong, Peoples R China
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2020年 / 240卷
关键词：
Nanostructured TiO2-Al2O3-BTA coating; Functionally graded coating; Corrosion resistance; Sol-gel; Electrochemical impedance spectroscopy; THIN-FILMS; PERFORMANCE; INHIBITORS; 8-HYDROXYQUINOLINE; CALCINATION; PROTECTION; RESISTANCE; ALLOY; STEEL; EIS;
D O I：
10.1016/j.matchemphys.2019.122233
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The corrosion behavior of titania-alumina-Benzotriazole and functionally graded (FG) coatings deposited on AA 2024-T3 is investigated. The FG coatings are doped with different amounts of Benzotrtazole (BTA) as an inhibitor and the Al2O3-TiO2-BTA coating has a similar amount of BTA in the layers. The coatings are deposited by the solgel and dip-coating techniques and the morphology, structure, and corrosion resistance are investigated systematically. The amorphous TiO2-Al2O3-BTA and FG coatings with thicknesses of 2.3 and 2.6 mu m show corrosion resistance of 105,672 Omega Cm-2 and 252,731 Omega. Cm-2, respectively, after immersion in 3.5% NaCl for 96 h. The difference is caused by controllable release of BTA from the FG coatings. The results show that the FG coatings are superior to conventional nanostructured TiO2-Al2O3-BTA coatings from the perspective of corrosion protection.
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页数：9
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