Should the oxygen source be considered in the initiation of KCl-induced high-temperature corrosion?

Juho Lehmusto*, Mohammad Sattari, Mats Halvarsson, Leena Hupa

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The role of two oxygen sources, oxygen and water vapor, in the initiation of KCl-induced high-temperature corrosion was addressed by studying two high-alloyed commercial materials at 550 °C. The differentiation between the two oxygen sources was implemented with 18O-enriched water and 16O2.
Based on the results, the solid-solid reaction between KCl(s) and the protective oxide on the alloy surface appeared to be more responsible for corrosion than the gas-solid reaction between KCl(g) and the protective oxide. Water was more involved in the abovementioned reactions than O2: 18O was the main oxygen isotope found in the formed surface oxides and intermediates.
Original languageEnglish
Article number109332
JournalCorrosion Science
Volume183
DOIs
Publication statusPublished - 1 May 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Alloy
  • Stainless steel
  • SEM
  • SIMS
  • TEM
  • XPS
  • High-temperature corrosion

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