Prevention of passive film breakdown on iron by coverage with one-dimensional polymer films of a carboxylate ion self-assembled monolayer modified with alkyltriethoxysilanes

Kunitsugu Aramaki, Tadashi Shimura

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

A film composed of a one-dimensional polymer was fabricated by modification of a 16-hydroxyhexadecanoate ion HO(CH2) 15CO2- self-assembled monolayer (SAM) adsorbed on a passivated iron electrode with octadecyltriethoxysilane C 18H37Si(OC2H5)3. The pitting potential, Epit of the passivated electrode coated with this film was measured by anodic polarization in a borate buffer solution containing 0. 1 M of Cl-. The Epit value of the electrode coated with the film was markedly shifted from the value of the bare electrode in the positive direction, indicating prevention of passive film breakdown. No breakdown occurred over the potential range of passive region in some cases. Structure of the modified SAM was discussed by X-ray photoelectron and FTIR reflection spectroscopies and contact angle measurement of the electrode surface covered with the film. Suppression of Cl- accumulation at a defect of the passive film was revealed by electron-probe microanalyses of the surfaces uncoated and coated with the SAM modified with octyltriethoxysilane C8H17Si(OC2H5)3 after anodic polarization in the borate buffer containing Cl-.

Original languageEnglish
Pages (from-to)2563-2581
Number of pages19
JournalCorrosion Science
Volume46
Issue number10
DOIs
Publication statusPublished - 2004 Oct 1

Keywords

  • EPMA
  • Iron
  • One-dimensional polymer films
  • Passive film breakdown
  • Polarization

ASJC Scopus subject areas

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

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