The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel

Ronald N. Clark, C. M. Chan, Tomas L. Martin, W. S. Walters, Dirk Engelberg, Robert Burrows, Geraint Williams

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

Niobium-stabilised austenitic stainless steel (20Cr-25Ni-Nb) has been immersed in sodium hydroxide, which is used as a corrosion inhibitor. The work shows how NbC precipitates may be degraded by use of pH 13 NaOH. Initial electrochemical measurements indicate that there is no benefit to this pretreatment as regards long-term corrosion inhibition, and post corrosion imaging shows the initiation of pitting corrosion at Nb-rich precipitates still present in the microstructure.

Original languageEnglish
Article number108596
JournalCorrosion Science
Volume170
Early online date16 Mar 2020
DOIs
Publication statusPublished - 1 Jul 2020

Keywords

  • A Stainless steel
  • B AFM
  • B EIS
  • B Polarisation
  • B SEM
  • C Alkaline corrosion
  • C Inclusion
  • C Intergranular corrosion
  • C Pitting corrosion
  • SIMS

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