钛合金表面二维码激光标刻的色变机理研究

Study on Coloration Mechanism of Two-Dimensional Code Module Labeling on Titanium Alloy Surface

针对钛合金表面二维码激光标刻的颜色变化问题,采用试验表征分析的方法对钛合金表面二维码的激光标刻色变机理进行探究,分别研究激光功率、扫描线间距、激光频率、扫描速度等对激光标刻二维码的色变影响规律,借助分光光度计、扫描电子显微镜、光学显微镜、能谱仪等设备进行表征分析进一步探究色变机理。研究结果表明,随着激光能量密度变大,激光标刻后表面颜色整体呈现逐渐变黑的趋势。并在此基础上,对不同激光参数组合下所标刻二维码的入射光的反射率进行分析,对其微观形貌进行显微观察并测出其表面成分。发现引起二维码标刻色变的主要原因是:微观形貌的变化引起二维码标刻表面入射光的反射率发生变化,加工过程中产生的氮氧化物呈现出不同颜色,氮氧化物形成的薄膜厚度不同,引起不同的颜色变化。

Aiming at the color change of two-dimensional code laser marking on the surface of titanium alloy,this paper uses the method of experimental characterization analysis to explore the color change mechanism of two-dimensional code laser marking on the surface of titanium alloy.The influence of laser power,scanning line spacing,laser frequency and scanning speed on the color change of two-dimensional code laser marking is studied respectively.The spectrophotometer,scanning electron microscope,optical microscope,energy spectrometer and other equipment are used to characterize and analyze the mechanism of color change.The results show that with the increase of laser energy density,the surface color after laser marking gradually becomes black.On this basis,the reflectivity of the incident light of the two-dimensional code marked under different laser parameter combinations is analyzed,and its microscopic morphology is observed and its surface composition is measured.It is found that the main reason for the color change of the two-dimensional code marking is that the change of the micro-morphology causes the change of the reflectivity of the incident light on the surface of the two-dimensional code marking,and the nitrogen oxides produced during the processing process show different colors and the film thickness formed by the nitrogen oxides is different,causing different color changes.