High temperature corrosion of superheater steels by KCl and K2CO3 under dry and wet conditions

Juho Lehmusto; Patrik Yrjas; BJ Skrifvars; Mikko Hupa

doi:10.1016/j.fuproc.2012.05.020

High temperature corrosion of superheater steels by KCl and K2CO3 under dry and wet conditions

Juho Lehmusto, Patrik Yrjas, BJ Skrifvars, Mikko Hupa

Research output: Contribution to journal › Article › Scientific › peer-review

70 Citations (Scopus)

Abstract

The influence of both solid KCl and solid K₂CO₃ on the oxidn. behavior of a ferritic 10CrMo type steel and a nickel-based Alloy 625 type steel was investigated in the lab. Samples were exposed for a week at temps. of 500 °C, 550 °C, and 600 °C. The role of water vapor was also studied by carrying out exposures under two different atmospheres: dry air, and air with a water content of 30%. Analyses were performed with SEM/EDXA to det. the extent of corrosion, the elemental distribution, and the identification of corrosion products. Both salts were found to be corrosive towards both steels, but the influence of KCl was significantly greater than that of K₂CO₃. In terms of durability, Alloy 625 exhibited higher corrosion resistance than 10CrMo. In the case of 10CrMo, the oxide formed always consisted of iron oxide with a chromium-rich region near the original steel surface. In the case of Alloy 625, the oxide consisted mainly of nickel oxide when it formed in the presence of KCl, and chromium oxide when it formed in the presence of K₂CO₃.

Original language	Undefined/Unknown
Pages (from-to)	253–264
Number of pages	12
Journal	Fuel Processing Technology
Volume	104
DOIs	https://doi.org/10.1016/j.fuproc.2012.05.020
Publication status	Published - 2012
MoE publication type	A1 Journal article-refereed

Keywords

Ferritic steel
High temperature oxidation
Nickel-based alloy
Potassium carbonate
Potassium chloride
Water vapor

Access to Document

10.1016/j.fuproc.2012.05.020

Cite this

@article{3c3a2d4d66ad40deb2018ed6607d89d3,

title = "High temperature corrosion of superheater steels by KCl and K2CO3 under dry and wet conditions",

abstract = "The influence of both solid KCl and solid K2CO3 on the oxidn. behavior of a ferritic 10CrMo type steel and a nickel-based Alloy 625 type steel was investigated in the lab. Samples were exposed for a week at temps. of 500 °C, 550 °C, and 600 °C. The role of water vapor was also studied by carrying out exposures under two different atmospheres: dry air, and air with a water content of 30%. Analyses were performed with SEM/EDXA to det. the extent of corrosion, the elemental distribution, and the identification of corrosion products. Both salts were found to be corrosive towards both steels, but the influence of KCl was significantly greater than that of K2CO3. In terms of durability, Alloy 625 exhibited higher corrosion resistance than 10CrMo. In the case of 10CrMo, the oxide formed always consisted of iron oxide with a chromium-rich region near the original steel surface. In the case of Alloy 625, the oxide consisted mainly of nickel oxide when it formed in the presence of KCl, and chromium oxide when it formed in the presence of K2CO3.",

keywords = "Ferritic steel, High temperature oxidation, Nickel-based alloy, Potassium carbonate, Potassium chloride, Water vapor, Ferritic steel, High temperature oxidation, Nickel-based alloy, Potassium carbonate, Potassium chloride, Water vapor, Ferritic steel, High temperature oxidation, Nickel-based alloy, Potassium carbonate, Potassium chloride, Water vapor",

author = "Juho Lehmusto and Patrik Yrjas and BJ Skrifvars and Mikko Hupa",

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doi = "10.1016/j.fuproc.2012.05.020",

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TY - JOUR

T1 - High temperature corrosion of superheater steels by KCl and K2CO3 under dry and wet conditions

AU - Lehmusto, Juho

AU - Yrjas, Patrik

AU - Skrifvars, BJ

AU - Hupa, Mikko

PY - 2012

Y1 - 2012

N2 - The influence of both solid KCl and solid K2CO3 on the oxidn. behavior of a ferritic 10CrMo type steel and a nickel-based Alloy 625 type steel was investigated in the lab. Samples were exposed for a week at temps. of 500 °C, 550 °C, and 600 °C. The role of water vapor was also studied by carrying out exposures under two different atmospheres: dry air, and air with a water content of 30%. Analyses were performed with SEM/EDXA to det. the extent of corrosion, the elemental distribution, and the identification of corrosion products. Both salts were found to be corrosive towards both steels, but the influence of KCl was significantly greater than that of K2CO3. In terms of durability, Alloy 625 exhibited higher corrosion resistance than 10CrMo. In the case of 10CrMo, the oxide formed always consisted of iron oxide with a chromium-rich region near the original steel surface. In the case of Alloy 625, the oxide consisted mainly of nickel oxide when it formed in the presence of KCl, and chromium oxide when it formed in the presence of K2CO3.

AB - The influence of both solid KCl and solid K2CO3 on the oxidn. behavior of a ferritic 10CrMo type steel and a nickel-based Alloy 625 type steel was investigated in the lab. Samples were exposed for a week at temps. of 500 °C, 550 °C, and 600 °C. The role of water vapor was also studied by carrying out exposures under two different atmospheres: dry air, and air with a water content of 30%. Analyses were performed with SEM/EDXA to det. the extent of corrosion, the elemental distribution, and the identification of corrosion products. Both salts were found to be corrosive towards both steels, but the influence of KCl was significantly greater than that of K2CO3. In terms of durability, Alloy 625 exhibited higher corrosion resistance than 10CrMo. In the case of 10CrMo, the oxide formed always consisted of iron oxide with a chromium-rich region near the original steel surface. In the case of Alloy 625, the oxide consisted mainly of nickel oxide when it formed in the presence of KCl, and chromium oxide when it formed in the presence of K2CO3.

KW - Ferritic steel

KW - High temperature oxidation

KW - Nickel-based alloy

KW - Potassium carbonate

KW - Potassium chloride

KW - Water vapor

KW - Ferritic steel

KW - High temperature oxidation

KW - Nickel-based alloy

KW - Potassium carbonate

KW - Potassium chloride

KW - Water vapor

KW - Ferritic steel

KW - High temperature oxidation

KW - Nickel-based alloy

KW - Potassium carbonate

KW - Potassium chloride

KW - Water vapor

U2 - 10.1016/j.fuproc.2012.05.020

DO - 10.1016/j.fuproc.2012.05.020

M3 - Artikel

SN - 0378-3820

VL - 104

SP - 253

EP - 264

JO - Fuel Processing Technology

JF - Fuel Processing Technology

ER -