Corrosion rate and oxide scale characteristics of austenitic alloys in supercritical water

Yutaka Watanabe, Yuzo Daigo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Corrosion properties were investigated on stainless steels and Ni base alloys in supercritical water containing O.01mol/kg-H2SO4 at 400°C/30MPa as a function of oxygen concentration ranging from 3ppb to 800ppm. Alloys with high Fe content showed an interesting contrast in corrosion property in sulfuric acid-containing supercritical water between at the high oxygen condition (800ppm) and at the lower oxygen conditions (3ppb and 8ppm). At 8ppm of oxygen concentration or lower, corrosion rate was a unique function of Cr content of the alloys including both Ni base alloys and stainless steels. However, corrosion resistance of the iron-based alloys (316 stainless steels) was remarkably improved when oxygen concentration was increased up to 800ppm. Corrosion rate of alloy C-276, which contains 5.7% of iron, was also somewhat reduced under the high oxygen condition, while corrosion rate of the other "iron-less" Ni base alloys was accelerated as oxygen level was increased. Characteristics of oxide scales, in terms of chemical composition and compound structure, have been examined in connection with the corrosion properties of the alloys.

Original languageEnglish
Title of host publicationHigh-Temperature Oxidation and Corrosion 2005 - Proceedings of the International Symposium on High-Temperature Oxidation and Corrosion 2005
PublisherTrans Tech Publications Ltd
Pages213-220
Number of pages8
ISBN (Print)9780878494095
DOIs
Publication statusPublished - 2006 Jan 1
EventInternational Symposium on High-Temperature Oxidation and Corrosion, ISHOC-05 - Nara, Japan
Duration: 2005 Nov 302005 Dec 2

Publication series

NameMaterials Science Forum
Volume522-523
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

OtherInternational Symposium on High-Temperature Oxidation and Corrosion, ISHOC-05
CountryJapan
CityNara
Period05/11/3005/12/2

Keywords

  • Austenitic alloys
  • Corrosion
  • Nickel base alloys
  • Oxide scale
  • Stainless steel
  • Supercritical water

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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