A Study of the Effect of Laser Micro-Texture on Bond Strength and Fracture Mechanism of Paint Layer

作     者：Su, Shenli Wang, Chunming Mi, Gaoyang Xiong, Lingda Zhang, Wei Wang, Jun 

作者机构：School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China School of Mechanical Engineering and Automation Wuhan Textile University Wuhan430200 China 

出 版 物：《SSRN》 

年 卷 期：2023年

核心收录：

主　　题：Adhesion 

摘      要：As the most common protective layer in car body protection, the paint layer is an effective barrier against corrosion of the material matrix. The adhesion between the paint layer and the substrate is an important factor to ensure the long-term and effective protection of the paint layer. On the 5083 aluminum alloy substrate, a series of microfabrics with varying depths are produced by laser texturing, with the depth-to-width ratio ranging from 0.12~1.76. The adhesion test of standard GB/T 5210-2006 was used to study the effect of different texturing depths on the adhesion strength of the paint layer. The cross-sectional microstructure and fracture morphology of the paint layer were analyzed and characterized to study the deposition and fracture mechanism of the paint layer. The results show that the presence of laser microfabrics significantly enhances the adhesion of the paint layer, and the influence of microfabrics of different depths and dimensions on the adhesion of the paint layer is different. And found that the optimal depth size affecting the size of adhesion is around 0.67. By analyzing the cross-sectional microstructure and fracture morphology of the paint layer, it is found that the change in paint adhesion is the result of the change of specific surface area, the bonding condition of the paint layer and the substrate surface, and the bubble defect. At the same time, the process of the paint layer flowing on the substrate surface, filling the micro-texture, and forming bubbles was analyzed. © 2023, The Authors. All rights reserved.