Applicability of ToF-SIMS and stable oxygen isotopes in KCl-induced corrosion studies at high temperatures

Juho Lehmusto, Mikael Bergelin, Jingxin Sui, Jyrki Juhanoja, Bengt-Johan Skrifvars, Patrik Yrjas

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

The applicability of Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) in combination with the use of stable oxygen isotopes (16O and 18O) in high-temperature corrosion research was addressed in this study. In terms of the corrosion reaction timescale, the focus was on the initiation of KCl-induced high-temperature corrosion and on the behaviour of three commercial alloys under conditions where multiple oxygen sources (air and water vapour) were present.ToF-SIMS proved to be an applicable tool in high-temperature corrosion studies, in this case, providing detailed information about the distribution of the two oxygen isotopes at the sample surfaces. Oxygen from air prefers to form a solid intermediate, potassium chromate (K2CrO4), when reacting with a chromia-forming alloy, whereas oxygen from both sources was found in the oxide formed at the alloy surface. Regardless of the prevailing conditions, the nickel-based austenitic alloy withstood corrosion the best, then the iron-based high alloy austenitic steel, whereas the low alloy ferritic steel had the poorest corrosion resistance ability.

Original languageUndefined/Unknown
Pages (from-to)1–11
JournalCorrosion Science
Volume125
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • high-temperature corrosion
  • Oxidation
  • Low alloy steel
  • Stainless steel

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