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介绍了一种新颖的激光辅助化学方法去除低碳钢表面的氧化膜,该方法是利用激光诱导的振荡波和常规氧化垢去除工艺中的化学腐蚀技术相结合。Q-开关Nd∶YAG激光(波长1 064mm,FWHM 6ns)脉冲聚焦到液体表面,诱导酸液中的光学离解,产生强压力波。压力波起非接触式氧化膜破碎机的作用,增加了去除速率。与传统的溶剂式清洗相比,该法去除效率显著增高。利用光学显微镜、电子扫描显微镜和能量分散X射线分析,对去除速率进行定量测试。研究了压力脉冲、激光脉冲数、酸浓度、反应时间对除污效果的影响。研究表明,利用激光辅助可以在不改变甚至提高清洗效率的情况下降低酸浓度,提高污垢的去除速率,减少使用有毒化学物质的工业应用是可行的。
A novel laser assisted chemical method to remove the oxide film on the surface of mild steel is introduced. The method is based on the combination of laser-induced oscillatory wave and chemical etching in the conventional oxidation scale removal process. The Q-switched Nd: YAG laser (wavelength 1064 mm, FWHM 6 ns) pulsed onto the liquid surface, inducing an optical dissociation in the acid solution, creating a strong pressure wave. The pressure wave acts as a non-contact oxide film breaker, increasing the removal rate. Compared with the traditional solvent-based cleaning, the removal efficiency is significantly increased. The removal rates were quantified using light microscopy, scanning electron microscopy and energy dispersive x-ray analysis. The effects of pressure pulse, laser pulse number, acid concentration and reaction time on decontamination were studied. The research shows that it is feasible to reduce the acid concentration, improve the removal rate of dirt and reduce the industrial use of toxic chemicals by using laser-assisted method without changing or even increasing the cleaning efficiency.