Direct modification of a passivated iron electrode with alkyltriethoxysilanes for preventing passive film breakdown in a borate buffer containing 0.1 M of chloride ion

Kunitsugu Aramaki, Tadashi Shimura

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A passive film on an iron electrode was modified with alkyltriethoxysilanes directly. In order to examine the protective ability of the modified passive film against breakdown, the pitting potential, Epit was measured by anodic polarization of the modified electrode in a borate buffer solution (pH 8.49) containing 0.1 M of Cl-. The value of Epit for the modified electrode shifted in the positive direction from that of the unmodified electrode, indicating prevention of passive film breakdown. The modified passive film was not broken down in the passive and transpassive regions of polarization curve in some cases. However, many current spikes appeared in the all curves of the modified electrodes. The modified surface of passivated electrode was characterized by X-ray photoelectron and FTIR reflection spectroscopies and contact angle measurement. There were defects and clusters of associated water within the modified film and hence, Cl- could permeate through the defects, leading to appearance of current spikes and occurrence of breakdown.

Original languageEnglish
Pages (from-to)2332-2347
Number of pages16
JournalCorrosion Science
Volume48
Issue number8
DOIs
Publication statusPublished - 2006 Aug

Fingerprint

Borates
Chlorides
Buffers
Iron
Ions
Electrodes
Defects
Anodic polarization
Angle measurement
Photoelectrons
Pitting
Contact angle
Spectroscopy
Polarization
X rays
Water

Keywords

  • A. Iron
  • B. Polarization
  • B. XPS
  • C. Passive films
  • C. Polymer coatings

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

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title = "Direct modification of a passivated iron electrode with alkyltriethoxysilanes for preventing passive film breakdown in a borate buffer containing 0.1 M of chloride ion",
abstract = "A passive film on an iron electrode was modified with alkyltriethoxysilanes directly. In order to examine the protective ability of the modified passive film against breakdown, the pitting potential, Epit was measured by anodic polarization of the modified electrode in a borate buffer solution (pH 8.49) containing 0.1 M of Cl-. The value of Epit for the modified electrode shifted in the positive direction from that of the unmodified electrode, indicating prevention of passive film breakdown. The modified passive film was not broken down in the passive and transpassive regions of polarization curve in some cases. However, many current spikes appeared in the all curves of the modified electrodes. The modified surface of passivated electrode was characterized by X-ray photoelectron and FTIR reflection spectroscopies and contact angle measurement. There were defects and clusters of associated water within the modified film and hence, Cl- could permeate through the defects, leading to appearance of current spikes and occurrence of breakdown.",
keywords = "A. Iron, B. Polarization, B. XPS, C. Passive films, C. Polymer coatings",
author = "Kunitsugu Aramaki and Tadashi Shimura",
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T1 - Direct modification of a passivated iron electrode with alkyltriethoxysilanes for preventing passive film breakdown in a borate buffer containing 0.1 M of chloride ion

AU - Aramaki, Kunitsugu

AU - Shimura, Tadashi

PY - 2006/8

Y1 - 2006/8

N2 - A passive film on an iron electrode was modified with alkyltriethoxysilanes directly. In order to examine the protective ability of the modified passive film against breakdown, the pitting potential, Epit was measured by anodic polarization of the modified electrode in a borate buffer solution (pH 8.49) containing 0.1 M of Cl-. The value of Epit for the modified electrode shifted in the positive direction from that of the unmodified electrode, indicating prevention of passive film breakdown. The modified passive film was not broken down in the passive and transpassive regions of polarization curve in some cases. However, many current spikes appeared in the all curves of the modified electrodes. The modified surface of passivated electrode was characterized by X-ray photoelectron and FTIR reflection spectroscopies and contact angle measurement. There were defects and clusters of associated water within the modified film and hence, Cl- could permeate through the defects, leading to appearance of current spikes and occurrence of breakdown.

AB - A passive film on an iron electrode was modified with alkyltriethoxysilanes directly. In order to examine the protective ability of the modified passive film against breakdown, the pitting potential, Epit was measured by anodic polarization of the modified electrode in a borate buffer solution (pH 8.49) containing 0.1 M of Cl-. The value of Epit for the modified electrode shifted in the positive direction from that of the unmodified electrode, indicating prevention of passive film breakdown. The modified passive film was not broken down in the passive and transpassive regions of polarization curve in some cases. However, many current spikes appeared in the all curves of the modified electrodes. The modified surface of passivated electrode was characterized by X-ray photoelectron and FTIR reflection spectroscopies and contact angle measurement. There were defects and clusters of associated water within the modified film and hence, Cl- could permeate through the defects, leading to appearance of current spikes and occurrence of breakdown.

KW - A. Iron

KW - B. Polarization

KW - B. XPS

KW - C. Passive films

KW - C. Polymer coatings

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