Initial oxidation mechanisms of stainless steel Sanicro 28 (35Fe27Cr31Ni) exposed to KCl, NaCl, and K2CO3 under dry and humid conditions at 535 °C

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Jingxin Sui, Juho Lehmusto, Mikael Bergelin, Leena Hupa
Publisher: Elsevier
Publication year: 2019
Journal: Corrosion Science
Journal acronym: Corros. Sci.
Volume number: 155
Issue number: N/A
Start page: 29
End page: 45


Abstract

The initial stage of oxidation reactions at the surface of the stainless
steel Sanicro 28 (Fe31Cr27Ni) exposed to KCl, NaCl, or K2CO3
in flowing dry and humid air at 535 °C was investigated using
chronoamperometry, SEM–EDX and XPS. All studied salts accelerated the
corrosion process. Na+ resulted in a higher amount of Na2CrO4 and a thicker chromium–rich scale compared to K+. CO32−
was involved in a reaction with iron only under humid conditions. The
results show that humidity affects the corrosion mechanisms and it
should thus be taken into account especially in the combustion of
biomasses with high humidity.


Keywords

Alkali salts, High-temperature corrosion, SEM/EDS analyses, Stainless steel, X-ray photoelectron spectroscopy (XPS)

Last updated on 2019-23-10 at 02:33