DETECTION OF CHLORINE IONS ON THE SURFACE OF REINFORCEMENT STEELS AFTER CONTACT WITH THE MODEL ENVIRONMENT BY MASS SPECTROMETRY
Abstract
This article presents results on the application of mass spectroscopy with a source based on matrix-activated or surface-activated laser desorption/ionization (MALDI/SALDI) for the detection of chlorine on the surface of reinforcing steels after exposure to an environment simulating chloride contaminated concrete pore solution. Due to their informativity, rapidity and reliability, the MALDI/SALDI methods allow to perform the identification of contaminants, as well as the determination of corrosive products upon contact of materials with the environment. It was shown that the mass spectrum includes compounds that can be referred to organic impurities introduced on the sample. It was found that the largest peaks belong to iron hydroxide clusters in the +2 oxidation state. This fact reliably confirms the presence of corrosion at the investigated point. During ionization, various cluster ions with chlorine are formed. Two-dimensional distribution diagrams of [FeCl3]– and [FeCl3∙Fe(OH)2]– particles were constructed for monitoring corrosion traces on the surface under study. The obtained results show the investigated surface heterogeneity, which is associated with active corrosion processes and acting features of the aggressive environment. Traces of adsorption of chlorine, which is a potential corrosion activator, were found on the steel surface, and its localization was shown. The distribution of the chloride ion over the studied surface is characterized by a relatively uniform distribution. The Cl– distribution diagram also shows areas that differ in concentration by several times, which characterize the next formation of corrosion pits. Thus, in this work, the possibilities of using the MALDI/SALDI methods for assessing the distribution of chlorine and detecting corrosion on steel surfaces at an early stage are shown.
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