Complete protection of a passive film on iron from breakdown in a borate buffer containing 0.1 M of Cl- by coverage with an ultrathin film of two-dimensional polymer

Kunitsugu Aramaki, Tadashi Shimura

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

An ultrathin film of two-dimensional polymer was prepared on a passivated iron electrode by modification of a 16-hydroxyhexadecanoate ion HO(CH2)15CO2- self-assembled monolayer with 1,2-bis(triethoxysilyl)ethane (C2H 5O)3Si(CH2)2Si(OC2H 5)3 and octadecyltriethoxysilane C18H 37Si(OC2H5)3. This film prevented passive film breakdown examined by potentiodynamic anodic polarization of the coated electrode in the borate buffer solution containing 0.1 M of Cl -. Neither current spikes nor the pitting potential was observed in the passive and transpassive regions of polarization curve. The anodic current density was decreased in these regions markedly, implying hindrance to permeation of Cl- and water through the film. Structure of the film was clarified by X-ray photoelectron and FTIR reflection spectroscopies and contact angle measurement with a drop of water. Electron-probe microanalysis of the passivated surface coated with the film after anodic polarization scanning up to the transpassive region revealed that the polymer film prevents pit initiation by an attack on the passive film with Cl-.

Original languageEnglish
Pages (from-to)209-225
Number of pages17
JournalCorrosion Science
Volume48
Issue number1
DOIs
Publication statusPublished - 2006 Jan 1

Keywords

  • EPMA
  • Iron
  • Passive film breakdown
  • Polarization
  • Two-dimensional polymer film

ASJC Scopus subject areas

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

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