Electrochemical and XPS investigation of the corrosion behavior of Alloy 690 at high-temperature water

Zhengang Duan, Farzin Arjmand, Lefu Zhang, Fanjiang Meng, Hiroaki Abe

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The effects of solution temperature, pH, and dissolved oxygen concentration on the electrochemical behavior of Alloy 690 in high-temperature water were investigated by electrochemical potentiodynamic polarization, and the oxide films developed on the specimens were characterized by X-ray photoelectron spectroscopy (XPS). The results revealed that in deaerated water + ETA solution decreasing the temperature and the pH of the environment improves the passivity of the oxide film on Alloy 690. The XPS analysis of the oxide film formed on Alloy 690 specimens after exposing to high-temperature water showed that the outer layer of the film consists of Ni hydroxides, Cr hydroxides, and NiFe2O4, while Cr2O3 and (Nix, Fe1 − x) Cr2O4 form the major part of the inner layer of the film.

Original languageEnglish
Pages (from-to)2265-2273
Number of pages9
JournalJournal of Solid State Electrochemistry
Volume19
Issue number8
DOIs
Publication statusPublished - 2015 Aug 27

Keywords

  • Alloy 690
  • High-temperature corrosion
  • Passive film
  • Potentiodynamic polarization
  • XPS

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

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