ABSTRACT The influence of surface roughness on adhesive bond strength for aluminium to aluminium bonding is investigated. firstly, the effect of varying surface roughness is investigated using grit-blast surface preparation. this is then compared to a novel ambient temperature blast coating technique known as coblast which, using a co-incident blast stream of abrasive and coating media, simultaneously removes a surface’s native passivation layer while depositing an active epoxy primer coating on the newly-exposed reactive metal surface. a range of al2o3 abrasive media with particle sizes from < 13 m to < 1200 m were used to prepare the varying surface roughness profiles. characterisation techniques such as surface profilometry, sem, edx, x-ray diffraction and light microscopy were used to investigate the level of coating coverage along with the degree of plastic deformation induced in the substrate as a result of the coating procedure. in addition, a modified lap shear test was conducted along with salt fog corrosion testing. results indicate that replacement of the grit-blast treatment with the epoxy coblast coating gives cohesive failure and an increase in lap shear strength of up to 15% before corrosion testing and up to 36% after 240 hours in a salt fog chamber.

中文翻译：

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使用喷砂工艺提高汽车工业铝表面之间的附着力

摘要 研究了表面粗糙度对铝与铝粘接的粘接强度的影响。首先，使用喷砂表面处理来研究不同表面粗糙度的影响。然后将其与称为 coblast 的新型环境温度喷砂技术进行比较，该技术使用研磨剂和涂层介质的共同喷射流，同时去除表面的天然钝化层，同时在新暴露的反应性涂层上沉积活性环氧底漆涂层。金属表面。一系列粒径从 < 13 m 到 < 1200 m 的 Al2O3 磨料介质用于制备不同的表面粗糙度轮廓。表征技术，如表面轮廓仪、sem、edx、X 射线衍射和光学显微镜用于研究涂层覆盖水平以及由于涂层程序在基材中引起的塑性变形程度。此外，还进行了改良的搭接剪切试验和盐雾腐蚀试验。结果表明，用环氧喷砂涂层代替喷砂处理会导致内聚破坏，并且在腐蚀测试之前将搭接剪切强度增加高达 15%，在盐雾室中 240 小时后增加高达 36%。