A smart self-healing coating utilizing pH-responsive dual nanocontainers for corrosion protection of aluminum alloy

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2024-10-30 DOI:10.1016/j.surfcoat.2024.131305

Juan Du, Hongyu Wang, Zhaolin Wang, Xiangyun Li, Haipeng Song

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Abstract

In this study, a novel smart self-healing coating was developed for aluminum alloy surfaces using chitosan and mesoporous ZSM-5 molecular sieve as dual nanocontainers. These nanocontainers effectively address the challenges of limited loading capacity and uncontrolled release of corrosion inhibitors by offering pH-responsive properties that enable complementary release in both acidic and alkaline environments. The synthesized coating exhibited excellent anticorrosion and self-healing performance, as demonstrated by a corrosion inhibition efficiency of 99.98 % after 36 h of static corrosion and significant improvements in impedance values at defect sites. The self-healing mechanism is primarily driven by the formation of Ce(OH)₃ and CeO₂, which precipitate and accumulate at the corrosion sites, thereby preventing further degradation. This study highlights the potential of pH-responsive dual nanocontainer-based coatings for enhancing the durability and protection of aluminum alloys in corrosive environments.

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利用 pH 响应双纳米容器的智能自修复涂层为铝合金提供腐蚀保护

本研究利用壳聚糖和介孔 ZSM-5 分子筛作为双重纳米载体，为铝合金表面开发了一种新型智能自修复涂层。这些纳米容器具有 pH 响应特性，可在酸性和碱性环境中互补释放缓蚀剂，从而有效解决了缓蚀剂负载能力有限和释放不可控的难题。经过 36 小时的静态腐蚀后，涂层的缓蚀效率达到了 99.98%，缺陷部位的阻抗值也得到了显著改善，这表明合成的涂层具有优异的防腐和自修复性能。自修复机制主要是由 Ce(OH)₃ 和 CeO₂ 的形成驱动的，它们在腐蚀点沉淀和积累，从而阻止了进一步的降解。这项研究强调了基于 pH 响应双纳米容器的涂层在提高铝合金在腐蚀环境中的耐久性和保护性方面的潜力。

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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.