Preparation of a one-dimensional polymer film on passivated iron by modification of a carboxylate ion self-assembled monolayer with octyltriethoxysilane for preventing passive film breakdown

Kunitsugu Aramaki, Tadashi Shimura

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A self-assembled monolayer (SAM) of 16-hydroxyhexadecanoate ion HO(CH 2)15-CO2 - (HOC16A -) has been prepared on an iron electrode passivated in a borate buffer solution (pH 8.49) in the preceding paper. In this work, the HOC 16A- SAM on the passivated electrode was modified with octyltriethoxysilane C8H17Si(OC2H 5)3 to form a film composed of one-dimensional polymer. Prevention of passive film breakdown was examined by anodic polarization measurements of the electrodes uncoated and coated with the modified SAM in the borate buffer containing 0.1 M of Cl-. The pitting potential, E pit of the coated electrode shifted from that of the uncoated electrode in the positive direction, indicating prevention of passive film breakdown. The anodic current density was decreased in the passive and transpassive regions by coverage with the modified SAM. Neither current spikes nor Epit was observed in the curve of the passive region in some cases, demonstrating complete protection of the passive film against breakdown in the Cl- solution. The modified SAM on the electrode was characterized by X-ray photoelectron and FTIR reflection spectroscopies and contact angle measurement.

Original languageEnglish
Pages (from-to)2533-2548
Number of pages16
JournalCorrosion Science
Volume46
Issue number10
DOIs
Publication statusPublished - 2004 Oct

Fingerprint

Self assembled monolayers
Polymer films
Iron
Ions
Electrodes
Borates
Buffers
Anodic polarization
Angle measurement
Photoelectrons
Pitting
Contact angle
octyltriethoxysilane
Polymers
Current density
Spectroscopy
X rays

Keywords

  • Iron
  • One-dimensional polymer film
  • Passive film breakdown
  • Polarization
  • Self-assembled monolayer

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

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title = "Preparation of a one-dimensional polymer film on passivated iron by modification of a carboxylate ion self-assembled monolayer with octyltriethoxysilane for preventing passive film breakdown",
abstract = "A self-assembled monolayer (SAM) of 16-hydroxyhexadecanoate ion HO(CH 2)15-CO2 - (HOC16A -) has been prepared on an iron electrode passivated in a borate buffer solution (pH 8.49) in the preceding paper. In this work, the HOC 16A- SAM on the passivated electrode was modified with octyltriethoxysilane C8H17Si(OC2H 5)3 to form a film composed of one-dimensional polymer. Prevention of passive film breakdown was examined by anodic polarization measurements of the electrodes uncoated and coated with the modified SAM in the borate buffer containing 0.1 M of Cl-. The pitting potential, E pit of the coated electrode shifted from that of the uncoated electrode in the positive direction, indicating prevention of passive film breakdown. The anodic current density was decreased in the passive and transpassive regions by coverage with the modified SAM. Neither current spikes nor Epit was observed in the curve of the passive region in some cases, demonstrating complete protection of the passive film against breakdown in the Cl- solution. The modified SAM on the electrode was characterized by X-ray photoelectron and FTIR reflection spectroscopies and contact angle measurement.",
keywords = "Iron, One-dimensional polymer film, Passive film breakdown, Polarization, Self-assembled monolayer",
author = "Kunitsugu Aramaki and Tadashi Shimura",
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AB - A self-assembled monolayer (SAM) of 16-hydroxyhexadecanoate ion HO(CH 2)15-CO2 - (HOC16A -) has been prepared on an iron electrode passivated in a borate buffer solution (pH 8.49) in the preceding paper. In this work, the HOC 16A- SAM on the passivated electrode was modified with octyltriethoxysilane C8H17Si(OC2H 5)3 to form a film composed of one-dimensional polymer. Prevention of passive film breakdown was examined by anodic polarization measurements of the electrodes uncoated and coated with the modified SAM in the borate buffer containing 0.1 M of Cl-. The pitting potential, E pit of the coated electrode shifted from that of the uncoated electrode in the positive direction, indicating prevention of passive film breakdown. The anodic current density was decreased in the passive and transpassive regions by coverage with the modified SAM. Neither current spikes nor Epit was observed in the curve of the passive region in some cases, demonstrating complete protection of the passive film against breakdown in the Cl- solution. The modified SAM on the electrode was characterized by X-ray photoelectron and FTIR reflection spectroscopies and contact angle measurement.

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