Forming Epoxy Coatings on Laser-Engraved Surface of Aluminum Alloy to Reinforce the Bonding Joint with a Carbon Fiber Composite

IF 2.9 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS
Coatings Pub Date : 2024-09-18 DOI:10.3390/coatings14091201
Hongping Zhu, Jinheng Zhang, Fei Cheng, Jiangzhou Li, Bo Wu, Zhijie Zhao
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Abstract

This study designed laser engraving and resin pre-coating (RPC) treatments on an aluminum alloy (AA) surface to construct through-the-thickness “epoxy pins” for improving the bonding strength with carbon fiber reinforced polymer (CFRP). A laser engraving treatment was used to create a pitted structure on the AA surface; higher wettability was acquired and greater vertical spaces were formed to impregnate epoxy resin, resulting in stronger mechanical interlocking. The RPC technique was further used to guide high-viscosity epoxy resin into pits to form the epoxy coatings and to minimize defects between the resin and the substrate. The bonding strength of the specimen treated with both laser engraving with a unit dimension of 0.3 mm and RPC increased up to 227.1% in comparison with that of the base. The failure modes of the hybrid composites changed from the debonding failure of the AA surface to the delamination-dominated failure of the laminated CFRP composites. It was confirmed that laser engraving is a feasible and effective method when combined with RPC for treating AAs to improve the bonding strength of AA-CFRP composites, which provides a reference for preparing high-performance hybrid composites with metals.
在激光雕刻的铝合金表面形成环氧涂层,以加固与碳纤维复合材料的粘接处
本研究设计了在铝合金(AA)表面进行激光雕刻和树脂预涂层(RPC)处理的方法,以构建贯穿厚度的 "环氧树脂栓",从而提高与碳纤维增强聚合物(CFRP)的粘接强度。通过激光雕刻处理在铝合金表面形成凹坑结构,获得更高的润湿性,并形成更大的垂直空间来浸渍环氧树脂,从而实现更强的机械互锁。RPC 技术还用于引导高粘度环氧树脂进入凹坑,形成环氧涂层,并最大限度地减少树脂与基材之间的缺陷。与基底相比,经过单位尺寸为 0.3 毫米的激光雕刻和 RPC 处理的试样的粘接强度提高了 227.1%。混合复合材料的失效模式从 AA 表面的脱粘失效转变为层状 CFRP 复合材料以分层为主的失效。研究证实,激光雕刻结合 RPC 处理 AA 以提高 AA-CFRP 复合材料的结合强度是一种可行且有效的方法,为制备高性能金属混合复合材料提供了参考。
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
Coatings
Coatings Materials Science-Surfaces, Coatings and Films
CiteScore
5.00
自引率
11.80%
发文量
1657
审稿时长
1.4 months
期刊介绍: Coatings is an international, peer-reviewed open access journal of coatings and surface engineering. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided. There are, in addition, unique features of this journal: * manuscripts regarding research proposals and research ideas will be particularly welcomed * electronic files or software regarding the full details of the calculation and experimental procedure - if unable to be published in a normal way - can be deposited as supplementary material
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