Department of Applied Physics I, Faculty of Sciences, University of Málaga, E-29071 Málaga, Spain.
Appl Spectrosc. 2010 Dec;64(12):1342-9. doi: 10.1366/000370210793561510.
The application of laser-induced breakdown spectroscopy (LIBS) for online analysis of novel Zn based alloy coatings during continuous production of galvannealed steel has been demonstrated. Field trials were carried out at the ThyssenKrupp Steel (TKS) pilot plant in Dortmund, Germany. For this purpose, a portable LIBS demonstrator was constructed and evaluated, based on a dual-pulse Q-switched Nd:YAG laser, operated at 1064 nm. This system was used to generate plasmas on the moving sample surface after the annealing process, in order to control on-line the thickness of Mg on electrolytically galvanized steel. For variable Mg thicknesses (depending on strip speed of the pilot line, 100-1200 nm), and for steel sheets with a predetermined and constant Zn thickness (of 2 or 9 μm), a satisfactory agreement between plant LIBS measurements and data from laboratory chemical analysis (dissolution of the metallic coating and subsequent inductively coupled plasma-optical emission spectroscopy (ICP-OES) analysis) of Mg coating thicknesses has been obtained. The effects of environmental conditions on field measurements (strip temperature, mechanical vibrations, moisture on surface, etc.) have been demonstrated to be negligible, whereas minimal damage (crater diameters less than 150 μm) to the sample surface was caused.
激光诱导击穿光谱（LIBS）在镀锌钢连续生产过程中对新型 Zn 基合金涂层的在线分析中的应用已经得到了证实。在德国多特蒙德的蒂森克虏伯钢铁公司（TKS）试验工厂进行了现场试验。为此，构建并评估了一种基于双脉冲 Q 开关 Nd:YAG 激光器（工作波长为 1064nm）的便携式 LIBS 演示器。该系统用于在退火工艺后对移动的样品表面产生等离子体，以在线控制镀锌钢上的 Mg 厚度。对于不同的 Mg 厚度（取决于试验线的带速，100-1200nm），以及对于具有预定且恒定 Zn 厚度（2 或 9μm）的钢板，工厂 LIBS 测量值和来自实验室化学分析（金属涂层的溶解和随后的电感耦合等离子体-光学发射光谱（ICP-OES）分析）的 Mg 涂层厚度数据之间得到了令人满意的一致性。已经证明，环境条件对现场测量的影响（带材温度、机械振动、表面湿度等）可以忽略不计，而对样品表面造成的最小损伤（熔坑直径小于 150μm）。
