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        Superhydrophobic and smart MgAl-LDH anti-corrosion coating on AZ31 Mg surface

        Manyi Huang,Guangming Lu,Jibin Pu,Yujie Qiang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-

        Layered double hydroxides (LDHs) have been widely used as ‘‘smart” containers in the field of metal corrosionprotection, and have broad industrial prospects. It is environmentally friendly and feasible to usealiphatic carboxylates and corresponding acids as substitutes for harmful corrosion inhibitors. However,previous studies rarely involved comparing the anti-corrosion mechanisms of different aliphatic acidsmodified on the LDH surface, and the durability of the prepared coatings also needs to be improved. Inthis work, MgAl-LDH laminates were grown in situ on AZ31 substrates by a hydrothermal method,and then modified by sodium laurate (SL) and sodium dodecylbenzene sulfonate (SDBS). Due to the physicalbarrier effect of the LDH layers, the spatial repulsion effect of the air film and the ion exchange reactionsin the interlayer galleries, the functional coatings prepared exhibit smart and superior anticorrosionperformance on the magnesium substrates in 3.5 wt.% NaCl solution. Compared with LDHSDBS-8 coating, the obtained superhydrophobic LDH-SL-8 coating shows more excellent long-term corrosionprotection owing to the stronger intercalation capacity.

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