Thermogravimetric studies of high temperature reactions between potassium salts and chromium

被引：42

作者：

Lehmusto, J. ^{[1
]}

Lindberg, D. ^{[1
]}

Yrjas, P. ^{[1
]}

Skrifvars, B. -J. ^{[1
]}

Hupa, M. ^{[1
]}

机构：

[1] Abo Akad Univ, SF-20500 Turku, Finland

来源：

CORROSION SCIENCE | 2012年 / 59卷

关键词：

Molten salts; SEM; High temperature corrosion; AUSTENITIC STAINLESS-STEEL; CORROSION BEHAVIOR; MOLTEN-CARBONATE; THERMODYNAMIC EVALUATION; PURE CR; KCL; WASTE; 600-DEGREES-C; OPTIMIZATION; DEPOSITS;

D O I：

10.1016/j.corsci.2012.02.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：55 / 62

页数：8

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[1] FactSage thermochemical software and databases - recent developments [J].