Mechanically durable PAL-based superhydrophobic composite coatings with a sandwich structure for corrosion protection of aluminum alloys

IF 7.3 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2025-08-30 DOI:10.1016/j.porgcoat.2025.109616

Chen-Xiang Wang, Wei Wang, Xue-Fen Zhang

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引用次数: 0

Abstract

Conventional superhydrophobic composite coatings fail to meet the service needs of aluminum alloys in harsh environments due to their inadequate bonding of hydrophobic particles in the topcoat and vulnerability to organic contamination. To address these challenges, a palygorskite-based superhydrophobic composite coating has been developed, inspired by nacre. The coating is composed of an epoxy resin primer and a polydimethylsiloxane (PDMS) strengthened layer with superhydrophobic palygorskite in between, forming a sandwich structure. The effect of PDMS concentration on the coating's wettability, surface morphology, and mechanical durability was thoroughly investigated. Results show that at 0.3 g/mL PDMS concentration, the final coating (ESPP) exhibits optimal abrasion resistance, withstanding an abrasion distance of 8000 cm on 600-grit sandpaper under a 100 g load. When immersed in 3.5 wt% NaCl solution for 44 days, the low-frequency impedance modulus (|Z|_lf) of the ESPP coating maintains as high as 8.34 × 10⁶ Ω∙cm². Even when contaminated with organic contaminants, the coating's corrosion current density is 4 orders of magnitude lower, while its |Z|_lf is four orders of magnitude higher compared to that of the coating lacking the PDMS layer. This study is expected to offer new insights into the design of mechanically robust and oil-resistant superhydrophobic anti-corrosion coatings.

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机械耐用的具有夹层结构的pal基超疏水复合涂层，用于铝合金的防腐

传统的超疏水复合涂层由于面漆中疏水颗粒结合不足，易受有机污染，不能满足恶劣环境下铝合金的使用需求。为了应对这些挑战，受珍珠质启发，一种基于坡壁石的超疏水复合涂层被开发出来。该涂层由环氧树脂底漆和聚二甲基硅氧烷（PDMS）强化层组成，中间夹有超疏水性坡面石，形成夹层结构。研究了PDMS浓度对涂层润湿性、表面形貌和机械耐久性的影响。结果表明，当PDMS浓度为0.3 g/mL时，最终涂层（ESPP）的耐磨性最佳，在600粒砂纸上承受100 g载荷的磨损距离为8000 cm。在3.5 wt% NaCl溶液中浸泡44 d后，ESPP涂层的低频阻抗模量（|Z|lf）保持高达8.34 × 106 Ω∙cm2。即使被有机污染物污染，涂层的腐蚀电流密度也比不含PDMS层的涂层低4个数量级，而其|Z|lf则高出4个数量级。这项研究有望为机械坚固和耐油的超疏水防腐涂层的设计提供新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.