7050铝合金阳极氧化后表面激光清洗参数优化  

Optimization of Surface Laser Cleaning Parameters of 7050 Aluminum Alloy after Anodizing

作　　者：姜远茂 王守仁[1] 王高琦 肖振 李沛凝 张路雨 JIANG Yuanmao;WANG Shouren;WANG Gaoqi;XIAO Zhen;LI Peining;ZHANG Luyu(School of Mechanical Engineering,University of Jinan,Jinan 250022,China)

机构地区：[1]济南大学机械工程学院,济南250022

出　　处：《表面技术》2025年第1期191-204,共14页Surface Technology

基　　金：泰山学者工程专项基金(2022-2027)。

摘　　要：目的明确激光清洗7050铝合金阳极氧化膜的工艺参数。方法采用高斯脉冲光纤激光器对7050铝合金阳极氧化后表面进行激光清洗,通过改变激光功率以及扫描次数来探究去除阳极氧化膜的最佳参数,并对不同参数激光清洗后表面的各项性能进行研究,同时分析激光清洗铝合金阳极氧化膜的清洗阈值以及机理。结果经过合理激光参数清洗的样品,表面氧化膜被完全去除,对基体没有明显损伤。单次扫描最佳与2次扫描最佳的样品的显微硬度分别提升到182.86HV、187.36HV,相对于基体分别提升了7.9%、10.6%。单次扫描最佳与2次扫描最佳样品的自腐蚀电流密度量级相对于基体均从10^(–4)减小到10^(–5),两者差值仅有10^(–6)。单次扫描最佳与两次扫描最佳样品的磨痕深度相对于基体分别减少6.3、6.8μm,摩擦因数均小于0.3。激光清洗前后试样的磨损机制均是磨粒磨损、黏着磨损以及氧化磨损相互结合的混合磨损,区别可能在于三者所占比重以及发生的时间和位置不同。结论激光清洗7050铝合金阳极氧化膜的清洗阈值在150~180 W,最佳参数是170 W扫描2次。在合适的激光清洗参数下,材料的各项性能优于基体。高斯脉冲激光清洗7050铝合金阳极氧化膜的机理是以振动为主,烧蚀为辅。Traditional surface cleaning methods such as physical method,chemical method,etc.,have various problems in efficiency,damage,pollution,etc.The new laser cleaning technology can improve the performance on the basis of solving these problems.However,the premise of achieving the above advantages is the use of appropriate laser process parameters.If the parameters are not set up,it is impossible to remove pollutants and even damage components,so it is necessary to optimize the parameters to reduce the impact of laser on the matrix.In order to determine the process parameters of laser cleaning 7050 aluminum alloy anodic oxide films.The surface of 7050 aluminum alloy after anodizing was cleaned by Gaussian pulse fiber laser.The optimal parameters of removing anodized films were investigated by changing the laser power and scanning times.Roughness measuring instrument,scanning electron microscope,friction and wear testing machine,white light interferometer,Vickers hardness tester,X-ray residual stress analyzer,electrochemical workstation and other instruments were used to analyze and study the properties of different parameters after laser cleaning of aluminum alloy anodic oxide films.The experimental results showed that the oxide film on the surface of the sample cleaned by reasonable laser parameters was completely removed,and there was no obvious damage to the matrix.Only when the laser power reached the cleaning threshold for removing the anodized film,could the anodized film be removed.When the cleaning threshold was not reached,the laser could only act on the surface of the oxide film.Excessive cleaning would destroy the matrix.The sample performance of low power multiple scanning was better than that of high power single scanning.At the same time,it was found that excessive laser scanning should be avoided as far as possible in the process of laser cleaning,with a maximum of two scans and the power should be reduced.The microhardness of the samples with the best single scan and the best double scans was increased

关 键 词：激光清洗 铝合金 阳极氧化膜 工艺参数优化 性能研究 机理分析 

分 类 号：V252[一般工业技术—材料科学与工程] TN249[航空宇航科学与技术—航空宇航制造工程]