The influence of alkali-halide additions on the stress corrosion cracking of an austenitic stainless steel in MgCl2 solution

P. Pinkus, D. Eliezer, D. Itzhak

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5 Scopus citations

Abstract

The influence of NaCl, NaBr, NaI additions on the stress corrosion cracking (s.c.c.) of Type 304 stainless steel in 38 wt% aqueous MgCl2 solution at 135°C has been investigated. Slow strainrate and U-Bend tests, potentiodynamic measurements and fractographic observation were employed. The results indicate clearly that the addition of 1N NaI or NaBr to the boiling MgCl2 solution prevents stress corrosion cracking of the steel while NaCl additions accelerates cracking. It is suggested that the addition of NaI inhibits mainly the cathodic process. The I- ion is oxidized by the dissolved oxygen through the following reaction: 41- + 4H+ + O2 → 2I2 + 2H2O. Due to this reaction O2 and H+ are not reacted cathodically with the metal. This process enhanced the cathodic inhibition effect and results in preventing s.c.c. of the AISI 304 stainless steel in 38 wt% MgCl2 boiling solution.

Original languageEnglish
Pages (from-to)417-423
Number of pages7
JournalCorrosion Science
Volume21
Issue number6
DOIs
StatePublished - 1 Jan 1981

ASJC Scopus subject areas

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

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