Prevention of passive film breakdown on iron in a borate buffer solution containing chloride ion by coverage with a self-assembled monolayer of hexadecanoate ion

Kunitsugu Aramaki, Tadashi Shimura

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Breakdown of a passive film on iron in a borate buffer solution (pH 8.49) containing 0.1 M of Cl- was suppressed by coverage of the passive film surface with a self-assembled monolayer (SAM) of hexadecanoate ion C15H31CO2- (C16A-). The pitting potential of an iron electrode previously passivated in the borate buffer at 0.50 V/SCE increased by treatment in an aqueous solution of sodium hexadecanoate for many hours, indicating protection of the passive film from breakdown caused by an attack on defects of the film with Cl-. No breakdown occurred over the potential range of the passive region by coverage with the SAM of C16A- in some cases. Structures of the passive film and the monolayer were characterized by X-ray photoelectron and Fourier transform infrared reflection spectroscopies and contact angle measurement with a drop of water.

Original languageEnglish
Pages (from-to)2639-2655
Number of pages17
JournalCorrosion Science
Volume45
Issue number11
DOIs
Publication statusPublished - 2003 Nov

Fingerprint

Borates
Palmitates
Self assembled monolayers
Chlorides
Buffers
Iron
Ions
Angle measurement
Photoelectrons
Pitting
Contact angle
Monolayers
Fourier transforms
Sodium
Spectroscopy
Infrared radiation
X rays
Defects
Electrodes
Water

Keywords

  • A. Iron
  • B. Polarization
  • C. Passive film breakdown
  • Hexadecanoate ion
  • Self-assembled monolayer

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

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N2 - Breakdown of a passive film on iron in a borate buffer solution (pH 8.49) containing 0.1 M of Cl- was suppressed by coverage of the passive film surface with a self-assembled monolayer (SAM) of hexadecanoate ion C15H31CO2- (C16A-). The pitting potential of an iron electrode previously passivated in the borate buffer at 0.50 V/SCE increased by treatment in an aqueous solution of sodium hexadecanoate for many hours, indicating protection of the passive film from breakdown caused by an attack on defects of the film with Cl-. No breakdown occurred over the potential range of the passive region by coverage with the SAM of C16A- in some cases. Structures of the passive film and the monolayer were characterized by X-ray photoelectron and Fourier transform infrared reflection spectroscopies and contact angle measurement with a drop of water.

AB - Breakdown of a passive film on iron in a borate buffer solution (pH 8.49) containing 0.1 M of Cl- was suppressed by coverage of the passive film surface with a self-assembled monolayer (SAM) of hexadecanoate ion C15H31CO2- (C16A-). The pitting potential of an iron electrode previously passivated in the borate buffer at 0.50 V/SCE increased by treatment in an aqueous solution of sodium hexadecanoate for many hours, indicating protection of the passive film from breakdown caused by an attack on defects of the film with Cl-. No breakdown occurred over the potential range of the passive region by coverage with the SAM of C16A- in some cases. Structures of the passive film and the monolayer were characterized by X-ray photoelectron and Fourier transform infrared reflection spectroscopies and contact angle measurement with a drop of water.

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KW - Hexadecanoate ion

KW - Self-assembled monolayer

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