Journal
APPLIED SPECTROSCOPY
Volume 64, Issue 12, Pages 1342-1349Publisher
SAGE PUBLICATIONS INC
DOI: 10.1366/000370210793561510
Keywords
Laser Induced breakdown spectroscopy; LIBS; Laser ablation; Depth profile; Thickness determination; Galvanized coating; On line analysis
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Funding
- European Commission [RFCS CT-2006-00034]
- Spanish Ministerio de Educacion y Ciencia [CTQ2007-60348-E/BQU]
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The application of laser induced breakdown spectroscopy (LIBS) for on line 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 pm), 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 pm) to the sample surface was caused
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