Relationship between the microstructure and local corrosion properties of weld metal in austenitic stainless steels

Shun Tokita, Kota Kadoi, So Aoki, Hiroshige Inoue

Research output: Contribution to journalArticlepeer-review

Abstract

The purpose of this study is to evaluate the corrosion resistance of weld metal by electrochemical methods and discuss the relationship between microstructure and corrosion resistance. Intergranular and pitting corrosion resistances were measured using electrochemical potentiokinetic reactivation (EPR) test and pitting potential measurement respectively. The reactivation ratio and pitting potential corresponded to its chemical composition. The specimens containing more Cr and Mo showed higher resistance. In the EPR test, the dendrite core with a relatively low Cr content was corroded. In the pitting corrosion test, Nb carbide became the initiation site of pitting corrosion which propagated along the cell structure.

Original languageEnglish
Article number108867
JournalCorrosion Science
Volume175
DOIs
Publication statusPublished - 2020 Oct
Externally publishedYes

Keywords

  • Intergranular corrosion
  • Pitting corrosion
  • Segregation
  • Stainless steel
  • Welding

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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