Multi-functional superhydrophobic coatings on MgLi alloys via SiO2 nano particles assembled surface modification

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2024-11-16 DOI:10.1016/j.surfcoat.2024.131568

Siyuan Jin , Jie Zhou , Ruizhi Wu , Xiaochun Ma , Mengyao Pang , Zhe Yu , Guixiang Wang , Jinghuai Zhang , Boris Krit , Sergey Betsofen , Neshchimenko Vitalii , Buzikov Ruslan , Min Qiu , Yurong Yang , Jiaming Chen

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Abstract

A multi-structured composite coating with superhydrophobic properties, corrosion resistance, and wear resistance was prepared on the surface of Mg-9Li-3Al alloy. A porous layer was formed on the substrate surface via micro-arc oxidation. Then, LDH was grown in situ on the MAO coating surface through hydrothermal treatment, sealing the pores in the coating. Finally, HDTMS-SiO₂ was assembled on the LDH surface. The SiO₂ formed an island-like micro-nano structure, trapping air and creating an “air cushion” on the coating surface，imparting superhydrophobicity (contact angle and sliding angle of 162.1 ± 2.1° and 4.2 ± 0.2°). And the corrosion resistance of the MLS coating is significantly improved the corrosion current density decreased by three orders of magnitude. The incorporation of HDTMS-SiO₂ not only improved the corrosion resistance of the coating but also significantly enhanced its wear resistance. During friction, the SiO₂ nanoparticles acted as “ball bearings,” shifting the friction mode from sliding to rolling. The fragmented SiO₂ further served as a solid lubricant, reducing the coefficient of friction to 0.11.

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通过二氧化硅纳米颗粒组装表面改性在镁锂合金上形成多功能超疏水涂层

在 Mg-9Li-3Al 合金表面制备了一种具有超疏水性、耐腐蚀性和耐磨性的多结构复合涂层。通过微弧氧化法在基材表面形成多孔层。然后，通过水热处理在 MAO 涂层表面原位生长 LDH，封闭涂层中的孔隙。最后，在 LDH 表面组装 HDTMS-SiO₂。SiO₂形成岛状微纳结构，截留空气并在涂层表面形成 "气垫"，赋予涂层超疏水性（接触角和滑动角分别为 162.1 ± 2.1° 和 4.2 ± 0.2°）。MLS 涂层的耐腐蚀性能也得到了显著改善，腐蚀电流密度降低了三个数量级。HDTMS-SiO₂ 的加入不仅提高了涂层的耐腐蚀性，还显著增强了其耐磨性。在摩擦过程中，SiO₂ 纳米颗粒起到了 "滚珠轴承 "的作用，将摩擦模式从滑动转变为滚动。碎裂的 SiO₂ 还可作为固体润滑剂，将摩擦系数降至 0.11。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.