激光清洗工艺参数对TC4钛合金表面除漆的影响  

Effect of Laser Cleaning Process Parameters on Surface Paint Removal of TC4 Titanium Alloy

作　　者：刘伟军 张铭祺 李强[1] 卞宏友 赵子铭 张栋 Liu Weijun;Zhang Mingqi;Li Qiang;Bian Hongyou;Zhao Ziming;Zhang Dong(School of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,Liaoning,China)

机构地区：[1]沈阳工业大学机械工程学院,辽宁沈阳110870

出　　处：《中国激光》2023年第4期95-103,共9页Chinese Journal of Lasers

基　　金：辽宁省“兴辽英才计划”项目(XLYC1902022);辽宁省揭榜挂帅科技攻关项目(2021JH1/10400077)。

摘　　要：采用脉冲光纤激光器对TC4钛合金表面的环氧锌黄漆层进行了激光清洗试验,研究了激光能量密度和激光清洗速度对清洗效果的影响规律,分析了试样清洗后的表面形貌、表面粗糙度以及物相组成,并测量了清洗后基材表面的维氏硬度。研究结果表明,清洗效果随着激光能量密度的增加或清洗速度的减小而逐渐变好;当激光能量密度为4.00 J/cm^(2)、清洗速度为3 mm/s时,清洗后基材表面的物相成分只有Ti和Ti6O,没有CaCO_(3),说明在此工艺参数下漆层已经完全被去除。彻底去除漆层后的钛合金的表面粗糙度与原始基材表面粗糙度相近,粗糙度为Sa=2.082μm。清洗后TC4钛合金试样表面的维氏硬度平均值为368.74 HV,相比原始硬度约提高了7.4%。研究结果表明,通过合理选择工艺参数,可以有效去除钛合金表面漆层,并获得较好的表面形貌,同时能提升其表面平均硬度。Objective Typically,a protective coating is sprayed onto the surface of materials to increase their service life,reduce the cost of use,and improve the aesthetics of the application.In complex environments and long-term application conditions,however,the paint layer will deteriorate,necessitating its removal in order to routinely inspect the substrate surface for detects.Traditional paint-stripping techniques have their own drawbacks,and laser cleaning technology has garnered more attention due to its benefits,including high efficiency and environmental friendliness.However,there are few reports on the laser cleaning technology of titanium-alloy surface-paint layers and the surface properties of the cleaned material.Moreover,the quality of laser cleaning appears to be highly dependent on the choice of process parameters.Herein,the effects of laser energy density and laser cleaning speed on the cleaning effect are investigated,and the optimal laser-paint removal process parameters are determined using phase analysis.In addition,the Vickers hardness of the substrate cleaned by laser is evaluated.Methods The epoxy zinc yellow-paint coated layer on the surface of TC4 titanium alloy was experimentally investigated using a pulsed fiber laser with a flat 1.5-mm^(2) top spot.The pulsed laser had a pulse width of 70 ns,pulse frequency of 10 kHz,a galvanometer scanning speed of 3000 mm/s,a laser energy density of 2.22?4.44 J/cm^(2),and a laser cleaning speed of 3?9 mm/s;accordingly,the single cleaning was performed in the experiment.The surface morphologies and roughnesses of the samples were measured by a laser confocal microscope,and the effects of laser energy density and cleaning speed on the removal of the paint layer were investigated.In addition,the laser energy density was determined by changing the laser power;an X-ray diffraction(XRD)was performed using a diffractometer to characterize the phase transition of the laser-cleaned paint layer to analyze the cleaning quality;Vickers hardnesses before and after paint r

关 键 词：激光技术 激光清洗 TC4钛合金 漆层 能量密度 清洗速度 

分 类 号：TN249[电子电信—物理电子学]