Depth Profile Studies Using Laser-Induced Plasma Emission Spectrometry

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The application of laser-induced plasma emission spectrometry to the depth profile measurement of coatings on steel is examined. The effects of key experimental parameters, such as laser energy and sample position relative to the laser focal point, on depth profile performance were characterized for a Zn/Ni coating on steel. With preferred operating conditions, linear calibrations against coating thickness for Zn/Ni (2.7 to 7.2 μm) and Sn (0.38 to 1.48 μm) on steel were achieved with good precision (3.5% relative standard deviation). An ultra-thin coating of Cr (20 nm) on steel was also detected by the technique. The depth profile performance and rapid measurement times, typically less than 60 s, indicate that the technique may be useful in industrial applications.

Keywords: Analysis of coatings; Depth profile measurement; Gated photodiode array detection; Laser ablation; Laser-induced plasma emission spectrometry

Document Type: Research Article


Affiliations: 1: Division of Chemistry, School of Science, Sheffield Hallam University, Sheffield, S1 1WB, U.K. 2: Division of Chemistry, School of Science, Sheffield Hallam University, Sheffield, S1 1WB, U.K.; address for correspondence: Centre for Analytical Sciences, Dept. of Earth Sciences, University of Sheffield, Sheffield S3 7HF, U.K. 3: British Steel Technical, Swinden Laboratories, Moorgate, Rotherham, S60 3AR, U.K. 4: Arun Technology Limited, Unit 16, Southwater Industrial Estate, Station Road, Southwater, Horsham, West Sussex, RH13 7UD, U.K.

Publication date: June 1, 1995

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