Role of the encapsulation strategy of smart containers on corrosion resistance and self-healing performance of micro-arc oxidation coating

IF 2.3 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Coatings Technology and Research Pub Date : 2024-09-04 DOI:10.1007/s11998-024-00981-w

Yuezhong Zhang, Xiaoting Chen, Yunfei Qiao, Xiaofeng Ding, Shaohua Zhang, Baosheng Liu

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Abstract

Encapsulating smart nano-containers loaded with corrosion inhibitors into coating is a promising approach to functionalize micro-arc oxidation (MAO) coating. The encapsulation strategy of smart containers has a great influence on the microstructure, corrosion resistance and self-healing performance of the smart MAO coating. In order to provide a comprehensive understanding, two kinds of MAO coating encapsulated smart containers (HNT-8HQ), MAO-HNT-8HQ (1S) coating (one-step preparation in an MAO electrolyte containing smart nano-containers) and MAO + HNT-8HQ (2S) coating (pre-prepared MAO coating through an embedding nano-container processing) were prepared on AZ31 magnesium alloy. The incorporated HNT-8HQ in electrolyte can effectively reduce coating porosity and increase coating thickness. Both smart MAO coatings show considerable improvements in the corrosion resistance and a certain self-healing capacity. The post-embedding treated coating (MAO + HNT-8HQ (2S)) has better long-term durability and self-healing performance than one-step preparation coating (MAO-HNT-8HQ (1S)). The low-frequency impedance modulus (|Z|_ƒ=0.01 Hz) of MAO + HNT-8HQ (2S) coating is 1.33 times that of MAO-HNT-8HQ (1S) coating after immersion in 3.5 wt% NaCl solution for 168 h. The MAO + HNT-8HQ (2S) coating has higher impedance values than MAO-HNT-8HQ (1S) coating during the entire self-healing process. The low-frequency impedance modulus of scratched MAO + HNT-8HQ (2S) coating is 3.33 times that of scratch MAO-HNT-8HQ (1S) coating after a 72 h self-healing process.

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智能容器的封装策略对微弧氧化涂层耐腐蚀性和自修复性能的影响

将装有缓蚀剂的智能纳米容器封装到涂层中是一种很有前景的微弧氧化（MAO）涂层功能化方法。智能容器的封装策略对智能 MAO 涂层的微观结构、耐腐蚀性和自修复性能有很大影响。为了全面了解这一问题，我们在 AZ31 镁合金上制备了两种封装了智能容器（HNT-8HQ）的 MAO 涂层：MAO-HNT-8HQ (1S) 涂层（在含有智能纳米容器的 MAO 电解液中一步制备）和 MAO + HNT-8HQ (2S) 涂层（通过嵌入纳米容器加工预先制备 MAO 涂层）。电解液中加入的 HNT-8HQ 能有效降低涂层孔隙率并增加涂层厚度。两种智能 MAO 涂层的耐腐蚀性能都得到了显著改善，并具有一定的自修复能力。与一步法制备的涂层（MAO-HNT-8HQ (1S)）相比，经过包埋处理的涂层（MAO + HNT-8HQ (2S)）具有更好的长期耐久性和自修复性能。在 3.5 wt% 的 NaCl 溶液中浸泡 168 小时后，MAO + HNT-8HQ (2S) 涂层的低频阻抗模量（|Z|ƒ=0.01 Hz）是 MAO-HNT-8HQ (1S) 涂层的 1.33 倍。划痕 MAO + HNT-8HQ (2S) 涂层在 72 小时自愈合过程后的低频阻抗模量是划痕 MAO-HNT-8HQ (1S) 涂层的 3.33 倍。

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来源期刊

Journal of Coatings Technology and Research 工程技术-材料科学：膜

CiteScore

4.30

自引率

8.70%

发文量

130

审稿时长

2.5 months

期刊介绍： Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.