Effect of pH and activity coefficient of proton in high concentration brines on stress corrosion cracking of stainless steels

Hisashi Amaya, Masayuki Sagara, Takeo Kudo, Masakatsu Ueda, Kazuhiko Noda

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

The environmental factors which may have influence on the Stress Corrosion Cracking (SCC) susceptibility of stainless steels are temperature of solution, dissolved oxygen, chloride ion concentration, pH, cation species and so on. In this study, the effect of high concentration brines on the SCC susceptibility of stainless steels has been investigated. Especially, the variation of pH and activity in high concentration brines has been closely studied for the fundamental aspects to determine the effect of the cation species on the variation of pH. The pH imaging sensor (Scanning Chemical Microscope - SCHEM which can measure the two-dimensional pH distribution) was applied to examine the local pH distribution in high concentration brines. It is elucidated that the pH in CaCl2 or MgCl2 solution is more variable than in NaCl or KCl solution due to their higher activity coefficient of proton and lower buffer powers. The local pH measured by SCHEM in the lower buffer power solution (i.e. CaCl2) is very variable with the addition of a small amount of proton. The SCC mechanism with the active path corrosion (APC) in high concentration brines can be proposed on the basis of the effect of the high activity coefficient of proton and low buffer power on the pH. It can be also proposed that the effect of the cation in brines due to its variability in pH on SCC sensitivity should be considered.

Original languageEnglish
JournalNACE - International Corrosion Conference Series
Volume2005-April
Publication statusPublished - 2005 Jan 1
Externally publishedYes
EventCorrosion 2005 - Houston, United States
Duration: 2005 Apr 32005 Apr 7

Fingerprint

Brines
Stainless Steel
Activity coefficients
Stress corrosion cracking
Protons
Stainless steel
Cations
Buffers
Positive ions
Magnesium Chloride
Dissolved oxygen
Chlorides
Microscopes
Ions
Corrosion
Scanning
Imaging techniques
Sensors

Keywords

  • Activity coefficient
  • Brine
  • Buffer power
  • Cation
  • PH
  • Scanning chemical microscope (schem)
  • Stainless steel
  • Stress Corrosion Cracking (SCC)

ASJC Scopus subject areas

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

Cite this

Effect of pH and activity coefficient of proton in high concentration brines on stress corrosion cracking of stainless steels. / Amaya, Hisashi; Sagara, Masayuki; Kudo, Takeo; Ueda, Masakatsu; Noda, Kazuhiko.

In: NACE - International Corrosion Conference Series, Vol. 2005-April, 01.01.2005.

Research output: Contribution to journalConference article

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AU - Amaya, Hisashi

AU - Sagara, Masayuki

AU - Kudo, Takeo

AU - Ueda, Masakatsu

AU - Noda, Kazuhiko

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N2 - The environmental factors which may have influence on the Stress Corrosion Cracking (SCC) susceptibility of stainless steels are temperature of solution, dissolved oxygen, chloride ion concentration, pH, cation species and so on. In this study, the effect of high concentration brines on the SCC susceptibility of stainless steels has been investigated. Especially, the variation of pH and activity in high concentration brines has been closely studied for the fundamental aspects to determine the effect of the cation species on the variation of pH. The pH imaging sensor (Scanning Chemical Microscope - SCHEM which can measure the two-dimensional pH distribution) was applied to examine the local pH distribution in high concentration brines. It is elucidated that the pH in CaCl2 or MgCl2 solution is more variable than in NaCl or KCl solution due to their higher activity coefficient of proton and lower buffer powers. The local pH measured by SCHEM in the lower buffer power solution (i.e. CaCl2) is very variable with the addition of a small amount of proton. The SCC mechanism with the active path corrosion (APC) in high concentration brines can be proposed on the basis of the effect of the high activity coefficient of proton and low buffer power on the pH. It can be also proposed that the effect of the cation in brines due to its variability in pH on SCC sensitivity should be considered.

AB - The environmental factors which may have influence on the Stress Corrosion Cracking (SCC) susceptibility of stainless steels are temperature of solution, dissolved oxygen, chloride ion concentration, pH, cation species and so on. In this study, the effect of high concentration brines on the SCC susceptibility of stainless steels has been investigated. Especially, the variation of pH and activity in high concentration brines has been closely studied for the fundamental aspects to determine the effect of the cation species on the variation of pH. The pH imaging sensor (Scanning Chemical Microscope - SCHEM which can measure the two-dimensional pH distribution) was applied to examine the local pH distribution in high concentration brines. It is elucidated that the pH in CaCl2 or MgCl2 solution is more variable than in NaCl or KCl solution due to their higher activity coefficient of proton and lower buffer powers. The local pH measured by SCHEM in the lower buffer power solution (i.e. CaCl2) is very variable with the addition of a small amount of proton. The SCC mechanism with the active path corrosion (APC) in high concentration brines can be proposed on the basis of the effect of the high activity coefficient of proton and low buffer power on the pH. It can be also proposed that the effect of the cation in brines due to its variability in pH on SCC sensitivity should be considered.

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