HT250灰铸铁纳秒脉冲激光除漆工艺研究  

Nanosecond-Pulsed-Laser Paint Stripping of HT250 Gray Cast Iron

作　　者：郭召恒 周建忠[1] 孟宪凯[1] 孙奇 朱明 杨嘉年 付强 Guo Zhaoheng;Zhou Jianzhong;Meng Xiankai;Sun Qi;Zhu Ming;Yang Jianian;Fu Qiang(School of Mechanical Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Nanjing Institute of Advanced Laser Technology,Nanjing,Jiangsu 210038,China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013 [2]南京先进激光技术研究院,江苏南京210038

出　　处：《中国激光》2019年第10期183-189,共7页Chinese Journal of Lasers

基　　金：江苏省重点研发计划(产业前瞻与共性关键技术)项目(BE2017001-2,BE2017001-1);江苏大学校科研立项(17A178);江苏大学工业中心大学生创新实践基金(ZXJG2018056)

摘　　要：为揭示激光参数对纳秒脉冲激光除漆后表面形貌的影响规律,采用纳秒脉冲激光器对HT250铸铁表面水性防锈漆层进行激光清洗试验;研究了激光除漆后的表面形貌与氧含量的关系,以及激光除漆后表面的三维形貌、表面粗糙度;最后测量了残余漆层的面积,以此表征除漆率。结果发现:表面粗糙度随着激光功率的增大而增大,并随着除漆速度降低而呈现先减小后增大的趋势;随着脉冲频率的增大漆层发生焦化现象,清洗速度的减小使除漆机制由振动和烧蚀效应转变为以烧蚀效应为主,导致清洗率呈现先减小后增大的趋势;在本试验条件下,当激光功率为50 W、脉冲频率为90 kHz、除漆速度为7000 mm/s时,除漆效果最佳,除漆率为99.4%。A nanosecond-pulsed-laser paint stripping experiment is performed to reveal the influences of laser parameters on the surface morphology of laser paint stripping.The surface morphology and oxygen content are observed;the three-dimensional morphology and surface roughness are evaluated;the residual-paint-layer area is measured to characterize the cleaning rate.The results show that the roughness of the paint-stripped surface increases with the increasing laser power.With a decrease in the cleaning speed,the roughness first decreases and subsequently increases.Coking occurs with an increase in the pulse frequency.The paint removal mechanism changes from the vibration and ablation effects to the ablation effect with a decrease in the cleaning speed;this results in a decrease followed by an increase in the cleaning rate.Under the experimental condition of 50 W laser power,90 kHz pulse frequency,and 7000 mm/s cleaning speed,the best laser cleaning is achieved,and the paint stripping rate is 99.4%.

关 键 词：激光技术 激光除漆 工艺参数 表面形貌 表面粗糙度 除漆率 

分 类 号：TN249[电子电信—物理电子学]