ABSTRACT

The influence of surface roughness on adhesive joint strength for polymer coating reinforced with various fabrics to aluminum substrate was investigated. PA11 aluminum alloy was chosen as the substrate, which was prepared in two different methods: degreasing with acetone or abrasive blasting. Two different abrasives (F80 fused alumina or GH40 cast steel grit) were used for mechanical treatment to obtain different roughness parameters. The coatings were made of two matrices (polyurethane and epoxy resins) and four different reinforcement materials (glass, carbon, aramid, and carbon-aramid hybrid fabrics). The manufactured samples were subjected to roughness and coatings’ thickness measurements, wettability evaluation, and pull-off strength tests. Various mechanisms of detachment were observed. The increase in substrate roughness had a positive effect on the pull-off strength. The highest pull-off strength values were obtained for unreinforced polyurethane coating (4.46 MPa) and epoxy resin with glass fabric (3.07 MPa) after pretreatment with abrasive blasting with the use of F80 fused alumina.

摘要

研究了表面粗糙度对不同织物增强聚合物涂层与铝基体粘接强度的影响。选用 PA11 铝合金作为基材，采用两种不同的方法制备：丙酮脱脂或喷砂。使用两种不同的磨料（F80 电熔刚玉或 GH40 铸钢砂）进行机械处理以获得不同的粗糙度参数。涂层由两种基质（聚氨酯和环氧树脂）和四种不同的增强材料（玻璃、碳、芳纶和碳-芳纶混合织物）制成。制造的样品经过粗糙度和涂层厚度测量、润湿性评估和拉拔强度测试。观察到各种分离机制。基材粗糙度的增加对拉脱强度具有积极影响。在使用 F80 熔融氧化铝进行喷砂预处理后，未增强聚氨酯涂层 (4.46 MPa) 和带有玻璃纤维的环氧树脂 (3.07 MPa) 获得了最高的拉拔强度值。