Xu Zhenhai, Yue Yunhui, Zhang Donghe, Xue Shaoxi, Liu Erju, Shan Debin, Xu Jie, Guo Bin
CGN-HIT Advanced Nuclear and New Energy Research Institute, Harbin Institute of Technology, Harbin 150001, China.
Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450000, China.
Materials (Basel). 2025 Jan 21;18(3):484. doi: 10.3390/ma18030484.
The lubricating coating must be removed from the forged or stamped workpieces. Developing environment-friendly and high-precision cleaning technology is necessary. In this study, a nanosecond pulsed laser was used to clean the graphite lubricating coating of 15 μm thickness on the surface of an MB15 magnesium alloy. The effects of various laser cleaning parameters on the cleaning quality and the cleaning mechanism were studied. When the laser fluence () increases from 1.27 to 7.64 J/cm, the clearance rate increases, and the surface roughness initially decreases before increasing. When the pulse frequency () increases from 10 to 30 kHz, the single-pulse energy decreases, the clearance rate decreases, and the surface roughness increases. When the scanning speed () increases from 1000 to 5000 mm/s, the spot overlap rate decreases, the clearance rate decreases, and the surface roughness firstly decreases and then increases. The optimal cleaning parameter combinations are = 3.82 J/cm, = 10 kHz, and = 3000 mm/s. The graphite lubrication coating was almost completely removed without damaging the substrate surface, and the surface carbon content of the sample was decreased to 6.42%. The laser cleaning mechanism of the graphite lubricating coating on the magnesium alloy surface is dominated by thermal ablation. As the laser fluence increases, the physical and chemical reactions become more violent.
必须去除锻造或冲压工件上的润滑涂层。开发环保且高精度的清洗技术很有必要。在本研究中，使用纳秒脉冲激光清洗MB15镁合金表面厚度为15μm的石墨润滑涂层。研究了各种激光清洗参数对清洗质量和清洗机理的影响。当激光能量密度（）从1.27增加到7.64 J/cm时，清除率增加，表面粗糙度先减小后增大。当脉冲频率（）从10增加到30 kHz时，单脉冲能量减小，清除率降低，表面粗糙度增加。当扫描速度（）从1000增加到5000 mm/s时，光斑重叠率降低，清除率降低，表面粗糙度先减小后增大。最佳清洗参数组合为 = 3.82 J/cm， = 10 kHz， = 3000 mm/s。石墨润滑涂层几乎被完全去除，且未损坏基体表面，样品表面碳含量降至6.42%。镁合金表面石墨润滑涂层的激光清洗机理以热烧蚀为主。随着激光能量密度的增加，物理和化学反应变得更加剧烈。
