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Open AccessArticle

Perfect Combination of LBL with Sol–Gel Film to Enhance the Anticorrosion Performance on Al Alloy under Simulated and Accelerated Corrosive Environment

by Xia Zhao 1,2,3,4,*,†, Shuai Yuan 1,2,†, Zuquan Jin 2,*, Binbin Zhang 1,3, Nazhen Liu 1,2,3, Shibo Chen 5, Shuan Liu 1,3, Xiaolin Sun 2 and Jizhou Duan 1
1
Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2
Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao University of Technology, Qingdao 266032, China
3
Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology, Qingdao 266235, China
4
Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
5
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
*
Authors to whom correspondence should be addressed.
The authors contribute equally to this paper.
Materials 2020, 13(1), 111; https://doi.org/10.3390/ma13010111
Received: 11 November 2019 / Revised: 17 December 2019 / Accepted: 19 December 2019 / Published: 25 December 2019
(This article belongs to the Special Issue Hybrid and Composite Coatings and Thin Films)
Given their outstanding versatile properties, multilayered anticorrosion coatings have drawn great interest from researchers in the academic and engineering fields. However, the application of multilayered coatings is restricted by some limitations such as low interlayer compatibilities, the harsh preparation process, etc. This work introduced a composite film fabricated on a 2A12 aluminum alloy surface, including an anodic oxide film, a sol–gel film, and a layer-by-layer (LBL) self-assembling film from bottom to top. The microstructure and elemental characterization indicated that the finish of the coating with the LBL film resulted in a closely connected multilayered coating with a smoother surface. The anticorrosion performance was systematically evaluated in the simulated corrosive medium and neutral salt spray environment. The integrated coating with the LBL film presented an excellent anticorrosion ability with system impedance over 108 Ω·cm2 and a self-corrosion current density two orders of magnitude lower than that of the other coatings. After the acceleration test in a salt spray environment, the multilayered coatings could still show a good protective performance with almost no cracks and no penetration of chloride ions. It is believed that the as-constructed multilayered coating with high corrosive properties and a fine surface state will have promising applications in the field of anticorrosion engineering. View Full-Text
Keywords: multilayer; corrosion; impedance; layer-by-layer multilayer; corrosion; impedance; layer-by-layer
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MDPI and ACS Style

Zhao, X.; Yuan, S.; Jin, Z.; Zhang, B.; Liu, N.; Chen, S.; Liu, S.; Sun, X.; Duan, J. Perfect Combination of LBL with Sol–Gel Film to Enhance the Anticorrosion Performance on Al Alloy under Simulated and Accelerated Corrosive Environment. Materials 2020, 13, 111.

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