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

doi:10.1016/0010-938X(81)90040-8

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

Department of Materials Engineering

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	417-423
Number of pages	7
Journal	Corrosion Science
Volume	21
Issue number	6
DOIs	https://doi.org/10.1016/0010-938X(81)90040-8
State	Published - 1 Jan 1981

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Materials Science

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10.1016/0010-938X(81)90040-8

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

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.",

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T1 - The influence of alkali-halide additions on the stress corrosion cracking of an austenitic stainless steel in MgCl2 solution

AU - Pinkus, P.

AU - Eliezer, D.

AU - Itzhak, D.

PY - 1981/1/1

Y1 - 1981/1/1

N2 - 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.

AB - 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.

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

Abstract

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