Abstract In this study, the coating adhesion test results are presented for a primer that was coated on laser-interference structured surfaces of as-received Al2024-T3 specimens, i.e., without employing any polishing, cleaning, or any other surface alteration techniques. All of the laser-interference processing was performed by splitting the primary beam of a Q-switched Nd:YAG pulsed nanosecond laser into two beams and focused them to the same spot. The specimens were spray painted with a chromate-containing epoxy primer, CA7233, compliant to MIL-PRF-23377 Type I Class C2 specification. The adhesion of primer on Al surface with different treatments was assessed using the ASTM D3359 X-cut and cross-hatch tests. It was found that the laser processed specimens meet the performance requirements in the coating adhesion specifications by having a higher or identical ranking for coating adhesion specimens than those prepared with current state-of-the-art chemical conversion or sulfuric acid anodizing. The rastering with either 4 mm/s or 6 mm/s with a laser fluence of 1.78 J/cm2 is recommended to attain acceptable coating adhesion, even higher than that with the anodizing surface treatment. These results indicate that laser-interference shows significant potential as a non-chemical surface preparation technique for these coatings.

中文翻译：

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含铬环氧底漆在激光干涉处理的 Al2024-T3 表面上的涂层附着力

摘要 在这项研究中，涂层附着力测试结果是针对在收到的 Al2024-T3 样品的激光干涉结构表面上涂覆的底漆，即不使用任何抛光、清洁或任何其他表面改变技术的。所有激光干涉处理都是通过将 Q 开关 Nd:YAG 脉冲纳秒激光器的主光束分成两束并将它们聚焦到同一点来进行的。样品用含铬酸盐的环氧底漆 CA7233 喷涂，符合 MIL-PRF-23377 I 类 C2 类规范。使用 ASTM D3359 X-cut 和交叉影线测试评估不同处理的底漆在铝表面的附着力。发现激光加工的试样满足涂层附着力规范中的性能要求，因为涂层附着力试样的等级高于或相同，比用当前最先进的化学转化或硫酸阳极氧化制备的试样。建议使用 4 mm/s 或 6 mm/s 的光栅和 1.78 J/cm2 的激光能量密度获得可接受的涂层附着力，甚至高于阳极氧化表面处理的附着力。这些结果表明，激光干涉作为这些涂层的非化学表面制备技术显示出巨大的潜力。建议使用 78 J/cm2 以获得可接受的涂层附着力，甚至高于阳极氧化表面处理的附着力。这些结果表明，激光干涉作为这些涂层的非化学表面制备技术显示出巨大的潜力。建议使用 78 J/cm2 以获得可接受的涂层附着力，甚至高于阳极氧化表面处理的附着力。这些结果表明，激光干涉作为这些涂层的非化学表面制备技术显示出巨大的潜力。