纳秒脉冲激光清洗扫描速度对TC4钛合金表面氧化膜清洗质量的影响  

Effect of Nanosecond Pulsed Laser Cleaning Scanning Speed on Cleaning Quality of Oxide Films on TC4 Titanium Alloy Surface

作　　者：廖大松 汪倩 王非森 陈辉[1] 纪霏 文婷 周磊 Liao Dasong;Wang Qian;Wang Feisen;Chen Hui;Ji Fei;Wen Ting;Zhou Lei(Institute of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;Chengdu Jiaoda Zhihui Laser Technology Co.,Ltd.,Pengzhou 611936,Sichuan,China)

机构地区：[1]西南交通大学材料科学与工程学院,四川成都610031 [2]成都交大智辉激光科技有限公司,四川彭州611936

出　　处：《中国激光》2023年第4期200-212,共13页Chinese Journal of Lasers

基　　金：四川省重大科技专项(2020ZDZX0002);四川省科技计划项目(2020JDRC0047,2019JDRC0130)。

摘　　要：采用纳秒脉冲激光器对TC4钛合金表面的氧化膜及油污进行激光清洗,研究了扫描速度对清洗后试样表面形貌、成分、元素含量及价态的影响规律,并分析了扫描速度对表面粗糙度、硬度和耐腐蚀性能的影响。结果表明:当扫描速度为500 mm/s时,激光对基体的损伤大且会发生热氧化,表面形成TiO,O含量较高。随着扫描速度由3000 mm/s增加至10000 mm/s,表面逐渐变得光滑平整,O含量先降低后升高,Ti含量则先升高后降低。当扫描速度为9000 mm/s时,表面Ti含量(质量分数)达到最大值84.24%,O含量(质量分数)降至最小值4.54%,且粗糙度(Ra)最低约为0.907μm,清洗效果最佳。扫描速度的增加使清洗后表面的粗糙度先升高后降低。此外,激光清洗可使TC4钛合金表面的硬度和耐腐蚀性能有所提高。Objective TC4 titanium alloys have excellent overall performance and are widely used in the manufacture of key components for aerospace and military hardware.However,the oxide film on the surface can adversely affect its formation and performance,which results in porosity in the weld,reduced mechanical properties,reduced electrical conductivity,and weakened bonding of the plating or coating with the substrate.Therefore,the oxide film must be removed from the titanium alloy.Traditional methods for cleaning the oxide film on the surface of titanium alloys have many limitations.However,laser cleaning technology compensates for the shortcomings of traditional cleaning approaches with features such as being green,being efficient,and causing low damage.Several studies have discussed the influence of laser energy density on the cleaning effect.In this study,the effects of scanning speed on the cleaning effect of the oxide film on TC4titanium alloy surfaces are studied.The results can help optimize the laser cleaning process and improve the cleaning quality and efficiency of titanium alloys.Methods In this study,a nanosecond pulsed fiber laser is used to remove oxide film and oil stain from a TC4 titanium alloy surface at different scanning speeds.The surface morphology of the cleaned TC4 titanium alloy is observed by scanning electron microscopy(SEM).The effect of different scanning speeds on the surface chemical composition and chemical bonds of the sample surface is analyzed by energy-dispersive spectroscopy(EDS),X-ray diffraction(XRD),and X-ray photoelectron spectroscopy(XPS).The surface roughness is measured using a laser confocal microscope and the hardness of the surface is measured using a Vickers hardness tester with a load of 200 g.Finally,the corrosion resistances of TC4 titanium alloy before and after laser cleaning are measured on an electrochemical workstation.Results and Discussions As the pulsed laser scanning speed is increased,the surface oxide film and oil stain are gradually removed,and the original d

关 键 词：激光技术 激光清洗 钛合金氧化膜 表面形貌 化学成分 粗糙度 电化学腐蚀 

分 类 号：TN249[电子电信—物理电子学]