Issue 10, 2015

Estimating the grade of Mg corrosion using laser-induced breakdown spectroscopy

Abstract

We present a report on the potential use of the Laser-Induced Breakdown Spectroscopy (LIBS) technique for direct investigation of Mg corrosion and related optimization of the table-top LIBS system. Moreover, the preliminary study to prove the capability of this LIBS technique for the estimation of corrosion grade is given. In order to simulate the real corrosive environment, Mg samples were prepared in a constant climate chamber. We show that the corrosive layer on the sample surface significantly affects the properties of laser–matter interactions, i.e. among other parameters causing the matrix effect. Consequently, the properties and persistence of laser-induced plasmas (LIPs) and their composition, generated on such degraded surfaces, essentially differ. Collected radiation of LIP is then analysed and ratios of ionic to atomic Mg spectral lines are correlated with the grade of magnesium corrosion, i.e. content of Mg(OH)2 on the sample surface. The content of Mg(OH)2 is also correlated with plasma temperature as well as with the electron number density of LIP. Additionally, X-ray diffraction (XRD) analysis and optical profilometry were utilized to obtain more comprehensive information about the degradation grade of high purity Mg samples.

Graphical abstract: Estimating the grade of Mg corrosion using laser-induced breakdown spectroscopy

Article information

Article type
Paper
Submitted
07 jul 2015
Accepted
24 jul 2015
First published
06 aug 2015

J. Anal. At. Spectrom., 2015,30, 2099-2106

Author version available

Estimating the grade of Mg corrosion using laser-induced breakdown spectroscopy

P. Pořízka, I. Ročňáková, J. Klus, D. Prochazka, L. Sládková, P. Šperka, Z. Spotz, L. Čelko, K. Novotný and J. Kaiser, J. Anal. At. Spectrom., 2015, 30, 2099 DOI: 10.1039/C5JA00257E

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