Corrosion behavior of superheater steels in the presence of potassium salts under conditions relevant to biomass combustion

B3 Non-refereed conference proceedings


Internal Authors/Editors


Publication Details

List of Authors: Lehmusto Juho, Yrjas Patrik, Skrifvars Bengt-Johan, Hupa Mikko
Editors: N/A
Publication year: 2012
Journal: N/A
Publisher: N/A
Book title: 8th International Symposium on High-Temperature Corrosion and Protection of Materials


Abstract

The corrosion resistance of three steels; a ferritic 10CrMo type steel, an austenitic 304L type steel, and a nickel-based Alloy 625 type steel, to both solid KCl and K2CO3 was investigated in the laboratory. Samples were covered with either KCl or K2CO3 and held for 168h under two different atmospheres: dry air, and air with a water content of 30%. Analyses were performed with SEM/EDXA to determine the extent of corrosion, the elemental distribution, and for the identification of corrosion products. Both salts were found to be corrosive, and furthermore, water vapor was found to affect the reaction behavior of the salts. Alloy 625 exhibited the best corrosion resistance, whereas 10CrMo did not perform well even under the mildest conditions.


Keywords

Austenitic steel, Ferritic steel, Nickel-based alloy, Potassium carbonate, Potassium chloride

Last updated on 2019-17-10 at 03:15