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Determination of chromium in the surface nano-layer covering the Zn-based anti corrosion coating of steel sheets using a laser-induced breakdown spectrometry
Authors: Zvolská Magdalena | Pouzar Miloslav | Knotek Petr | Černohorský Tomáš
Year: 2017
Type of publication: článek v odborném periodiku
Name of source: Chemical Papers
Publisher name: Springer
Place: Heidelberg
Page from-to: 2045-2052
Titles:
Language Name Abstract Keywords
cze Stanovení chromu v nano-vrstvách pokrývajících povrch zinkových antikorozních vrstev na ocelových plechách pomocí spektroskopie laserem indukovaného mikroplazmatu (LIBS) V práci je popsán postup vývoje metody pro stanovení Cr, který je deponován v nanovrstvě na povrchu Zn vrstvy tvořící antikorozní ochranu ocelových plechů. Metoda je založená na využití spektroskopie laserem indukovaného mikroplazmatu (LIBS). Velká pozornost je věnována optimalizaci parametrů použitého LIBS spektrometru. Výsledky navržené metody jsou porovnány s výsledky metody, která je dnes pro daný účel běžně používána - tedy energiově disperzní rentgenfluorescenční spektrometrie (LIBS). Spektroskopie laserem indukovaného mikroplazmatu (LIBS); rentgenfluorescenční spektrometrie (XRF); Chrom; povrchová vrstva; ocelové plechy
eng Determination of chromium in the surface nano-layer covering the Zn-based anti corrosion coating of steel sheets using a laser-induced breakdown spectrometry A method was proposed for the determination of Cr in a thin surface nanolayer deposited on top of a micrometrical Zn-based anticorrosive coating of steel sheets using laser-induced breakdown spectrometry (LIBS). Optimization of the LIBS parameters was performed with respect to the statistical parameters of regression, these being the coefficient of determination (R-2), akaike information criterion and mean-squared prediction error. These were calculated for curves describing the relationship between the Cr surface concentration and the intensity of LIBS signal. The most critical parameter of analysis appears to be the focal spot diameter. When its value was 200 mu m and corresponding energy density (fluence) had value of 413.8 J/cm(2), the intensity-concentration relationship revealed a negative slope. This phenomenon was caused by the difference in total ablated volume for samples with a different content of Cr in the surface layer. This phenomenon was not observed for higher values of the focal spot diameter (400 and 500 mu m) and lower values of fluence (103.5 and 66.2 J/cm(2)). A range of calibration obtained under optimal conditions (focal spot diameter of 400 mu m; single pulse mode, laser pulse energy of 130 mJ) was 11-21 mg/m(2) and the limit of detection was 0.7 mg/m(2). The recovery values calculated from the results of the proposed LIBS method and the standard ED XRF method ranged from 99.2 to 101%. Laser-induced breakdown spectrometry; X-ray fluorescence spectrometry; Chromium; Surface layer; Steel sheets

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