Mechanisms of stress corrosion cracking for iron base alloys in hot Ca(NO3)2 solution

X. Y. Zhou, J. Congleton, Y. M. Han

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The stress corrosion cracking (SCC) susceptibilities of a series of iron base alloys were evaluated in a 2M Ca(NO3)2 solution at a temperature of 90°C. The inclusion distributions in each material were established using quantitative metallography and energy dispersive X-ray analysis (EDX). Electrochemical and microcorrosion measurements were also performed. Cracks were predominantly associated with pits that initiated at ruptures in the oxide film at potentials more anodic than -25 mV or by dissolution at sulphur containing inclusions at potentials more cathodic than -25 mV. Reducing the inclusion content and/or the activity of the inclusions in iron base alloys moves the minimum potential for cracking to more anodic potentials but does not eliminate SCC. The addition of sulphate to the test solution increased the susceptibilities of the alloys.

Original languageEnglish (US)
Pages (from-to)217-223
Number of pages7
JournalBritish Corrosion Journal
Volume35
Issue number3
DOIs
StatePublished - Jan 1 2000
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

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