Thermogravimetric studies of high temperature reactions between potassium salts and chromium

Juho Lehmusto; Daniel Kristoffer Lindberg; Patrik Yrjas; BJ Skrifvars; Mikko Hupa

doi:10.1016/j.corsci.2012.02.013

Thermogravimetric studies of high temperature reactions between potassium salts and chromium

Juho Lehmusto, Daniel Kristoffer Lindberg, Patrik Yrjas, BJ Skrifvars, Mikko Hupa

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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.

Original language	Undefined/Unknown
Pages (from-to)	55–62
Number of pages	8
Journal	Corrosion Science
Volume	59
DOIs	https://doi.org/10.1016/j.corsci.2012.02.013
Publication status	Published - 2012
MoE publication type	A1 Journal article-refereed

Keywords

High temperature corrosion
Molten salts
SEM

Access to Document

10.1016/j.corsci.2012.02.013

Cite this

@article{152bae82127a47468df9cdf601b1ccea,

title = "Thermogravimetric studies of high temperature reactions between potassium salts and chromium",

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, High temperature corrosion, Molten salts, SEM, High temperature corrosion, Molten salts, SEM",

author = "Juho Lehmusto and Lindberg, {Daniel Kristoffer} and Patrik Yrjas and BJ Skrifvars and Mikko Hupa",

year = "2012",

doi = "10.1016/j.corsci.2012.02.013",

language = "Odefinierat/ok{\"a}nt",

volume = "59",

pages = "55–62",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier",

}

TY - JOUR

T1 - Thermogravimetric studies of high temperature reactions between potassium salts and chromium

AU - Lehmusto, Juho

AU - Lindberg, Daniel Kristoffer

AU - Yrjas, Patrik

AU - Skrifvars, BJ

AU - Hupa, Mikko

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

KW - High temperature corrosion

KW - Molten salts

KW - SEM

KW - High temperature corrosion

KW - Molten salts

KW - SEM

KW - High temperature corrosion

KW - Molten salts

KW - SEM

U2 - 10.1016/j.corsci.2012.02.013

DO - 10.1016/j.corsci.2012.02.013

M3 - Artikel

SN - 0010-938X

VL - 59

SP - 55

EP - 62

JO - Corrosion Science

JF - Corrosion Science

ER -