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Thermo-driven oleogel-based self-healing slippery surface behaving superior corrosion inhibition to Mg-Li alloy
Journal of Magnesium and Alloys ( IF 17.6 ) Pub Date : 2022-07-29 , DOI: 10.1016/j.jma.2022.07.006
Yibo Ouyang , Huijun Kang , Enyu Guo , Ri Qiu , Keqiang Su , Zongning Chen , Tongmin Wang

Bioinspired by Nepenthes, lubricant infused surfaces (LIS) have attracted widespread attention in the field of anticorrosion. However, the lubricant coating has some disadvantages such as complex construction processing and easy loss of oil phase in air or dynamic water phase. In this study, oleogel is infused into a lotus leaf inspired super-hydrophobic matrix to form an oleogel infused surface (OIS) for enhancing corrosion resistance of active Mg-Li alloy. For reserving oleogel, firstly, a facile one-step electrodeposition method is used to construct super-hydrophobic surface (SHS) composed by samarium/myristic acid complex micro-nano flower structure onto Mg-Li alloy. The coating exhibits excellent superhydrophobic property at a static contact angle of 160° by applying 30 V electrolysis for 30 min. The protection efficiency of single SHS highly relates with the metal itself. For short period immersion in water phase, SHS can afford protection to Mg-Li alloy. However, the long-term immersion will see the rapid failure of SHS, and the high activity of Mg-Li alloy is one main reason. We assume that SHS cannot be a good choice for protecting Mg-Li alloy. Then, a Nepenthes inspired liquid coating is formed by infusing oleogel into the micro-nano structure by a spin-coating method. The liquid coating performs prominent corrosion resistance with Rct reaching as high as 1.51 × 1010 Ω cm². After the mechanical damage from the external environment, the liquid coating can realize self-repair through thermal assistance, and the liquid coating can still restore Rct up to 1.24 × 1010 Ω cm2 after healing. The corrosion resistance of the liquid coating remains strong by showing Rct as high as 1.14 × 109 Ω cm², even after immersion in representative corrosive 3.5 wt% NaCl solution for 30 d.



中文翻译:

基于热驱动油凝胶的自修复光滑表面对镁锂合金具有优异的缓蚀作用

受猪笼草的生物启发,注入润滑剂的表面(LIS)在防腐领域引起了广泛的关注。但润滑涂层存在施工加工复杂、油相在空气或动态水相中易流失等缺点。在这项研究中,将油凝胶注入受荷叶启发的超疏水基质中,形成油凝胶注入表面(OIS),以增强活性镁锂合金的耐腐蚀性能。为了保留油凝胶,首先采用一种简便的一步电沉积方法在镁锂合金上构建由钐/肉豆蔻酸复合微纳米花结构组成的超疏水表面(SHS)。通过施加30 V电解30 min,涂层在160°静态接触角下表现出优异的超疏水性能。单个SHS的防护效率与金属本身密切相关。对于短时间浸泡在水相中,SHS可以对镁锂合金提供保护。然而,长期浸泡会使SHS迅速失效,镁锂合金的高活性是主要原因之一。我们认为 SHS 不能成为保护镁锂合金的良好选择。然后,通过旋涂方法将油凝胶注入微纳米结构中,形成受猪笼草启发的液体涂层。液体涂层具有突出的耐腐蚀性能,Rct高达1.51×10 10  Ω cm²。液体涂层在受到外界环境的机械损伤后,可以通过热辅助实现自我修复,且愈合后液体涂层仍能恢复R ct高达1.24×10 10  Ω cm 2 。 即使在代表性的 3.5 wt% NaCl 腐蚀性溶液中浸泡 30 天,液体涂层的耐腐蚀性仍然很强, R ct高达 1.14 × 10 9 Ω cm²。

更新日期:2022-07-29
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