Working Paper Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 11 November 2019 / Approved: 12 November 2019 / Online: 12 November 2019 (10:17:53 CET)

How to cite: Zhao, X.; Jin, Z.; Yuan, S.; 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. Preprints 2019, 2019110127 Zhao, X.; Jin, Z.; Yuan, S.; 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. Preprints 2019, 2019110127

Abstract

Given of the outstanding versatile properties, the multilayered anti-corrosion coatings have drawn great interests in academic and engineering fields. However, the application of multilayered coatings is restricted by some limitations such as low interlayer compatibilities, harsh preparation process, etc. This work introduced a composite film fabricated on 2A12 aluminum alloy surface, including an anodic oxide film, a sol-gel film as well as 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 intergrated coating with the LBL film presented an excellent anticorrosion ability with the system impedance over 108 Ω•cm2 and the self-corrosion current density two orders of magnitude lower than that of the other coatings. After the acceleration test in 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 fine surface state will have promising applications in the field of anticorrosion engineering.

Subject Areas

multilayer; corrosion; impedance; layer-by-layer

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