Thermogravimetric studies of high temperature reactions between potassium salts and chromium

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Lehmusto J, Lindberg D, Yrjas P, Skrifvars BJ, Hupa M
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication year: 2012
Journal: Corrosion Science
Journal acronym: CORROS SCI
Volume number: 59
Start page: 55
End page: 62
Number of pages: 8
ISSN: 0010-938X


Abstract

This study compares the high temperature reactions of potassium chloride (KCl) and potassium carbonate (K2CO3), two salts found in fly ashes formed in biomass combustion, with both pure metallic chromium (Cr) and chromium oxide (Cr2O3). The reactions were investigated with thermogravimetric measurements and the results discussed based on thermodynamic calculations. In simple terms: potassium chloride reacted with chromium forming potassium chromate (K2CrO4) and chromium oxide. Potassium chloride did not react with chromium oxide. Potassium carbonate reacted with chromium oxide, but not with chromium. The presence of potassium is sufficient to initiate accelerated oxidation, but chloride is needed to sustain it.


Keywords

High temperature corrosion, Molten salts, SEM

Last updated on 2019-15-09 at 07:53

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