Preparation and corrosion behavior of layered double hydroxides-graphene oxide composite coatings modified by sodium dodecylbenzene sulfonate on the surface of AZ31 Mg alloy

Smart Materials in Manufacturing Pub Date : 2024-01-01 DOI:10.1016/j.smmf.2024.100054

Mingyi Wu , Liang Wu , Ruijun Wang , An Wang , Xiaowei Dai , Wenhui Yao , Yuan Yuan , Atrens Andrej , Jingfeng Wang , Fusheng Pan

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Abstract

Layered double hydroxides (LDHs) are a class of two-dimensional anionic clays with adjustable structure, which have certain corrosion resistance. However, smooth growth path of LDHs nanosheets perpendicular to the substrate limits its application in the field of corrosion. Graphene oxide (GO) possess a high specific surface area and barrier properties, which provides a promising method for further improving the corrosion resistance of LDHs. In this work, we prepared three different concentrations of sodium dodecylbenzene sulfonate (SDBS) modified GO (GO:SDBS concentration ratio = 1:1, 1:2, 1:3), and present MgAlCe-LDHs@GO-SDBS composite coatings by one-step hydrothermal method with well-zigzag morphology and good corrosion resistance. GO-SDBS was successfully incorporated in the layered double hydroxide (LDHs), the corrosion current density of the MgAlCe-LDHs@GO-S₂ coatings was 1.60 × 10⁻⁸ A cm⁻², which was lower than other coatings. This one-step growth of MgAlCe-LDHs@GO-S method has potential applications in manufacture of anti-corrosion protection coatings.

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十二烷基苯磺酸钠修饰的层状双氢氧化物-氧化石墨烯复合涂层在 AZ31 镁合金表面的制备和腐蚀行为

层状双氢氧化物（LDHs）是一类结构可调的二维阴离子粘土，具有一定的耐腐蚀性。然而，LDHs 纳米片垂直于基底的平滑生长路径限制了其在腐蚀领域的应用。氧化石墨烯（GO）具有高比表面积和阻隔性能，为进一步提高 LDHs 的耐腐蚀性提供了一种可行的方法。在这项工作中，我们制备了三种不同浓度的十二烷基苯磺酸钠（SDBS）修饰的 GO（GO:SDBS 浓度比 = 1:1、1:2、1:3），并通过一步水热法制备了 MgAlCe-LDHs@GO-SDBS 复合涂层，该涂层具有良好的人字形形貌和耐腐蚀性能。在层状双氢氧化物（LDHs）中成功加入了GO-SDBS，MgAlCe-LDHs@GO-S2涂层的腐蚀电流密度为1.60 × 10-8 A cm-2，低于其他涂层。这种一步法生长 MgAlCe-LDHs@GO-S 的方法有望应用于防腐蚀涂层的制造。

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Smart Materials in Manufacturing

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