Grain Size Effect on Corrosion Behavior of Inconel 625 Film Against Molten MgCl2-NaCl-KCl Salt

Jinghua Feng, Li Mao, Guangcui Yuan, Youyang Zhao, Judith Vidal, Li Liu

Research output: Contribution to journalArticlepeer-review

10 Scopus Citations

Abstract

This study evaluated the grain size effect of Inconel 625 film against molten chloride salt. It is found that larger grain size Inconel 625 exhibits better corrosion resistance by reducing Cr depletion. ~ 2 nm surface NiO layer of Inconel 625 is incapable of compensating the negative effects from more initiation corrosion sites. Mo is the least likely leached element and its enrichment occurs in Cr-depleted regions as a result of Mo diffusion. Mg and Cl are two most seen salt elements in all corroded samples, while K and Na only attack Inconel 625 with the smallest grain size.

Original languageAmerican English
Article number110097
Number of pages9
JournalCorrosion Science
Volume197
DOIs
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Ltd

NREL Publication Number

  • NREL/JA-5500-82002

Keywords

  • Corrosion
  • Grain
  • Molten salt
  • Ni-based alloy
  • Oxide

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