Ultrathin protective films of two-dimensional polymers on passivated iron against corrosion in 0.1 M NaCl

Kunitsugu Aramaki, Tadashi Shimura

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Prevention of iron corrosion in an aerated 0.1 M NaCl solution was investigated by polarization and mass-loss measurements of a passivated iron electrode covered with ultrathin and ordered films of two-dimensional polymers. The films were prepared on the passivated electrode by modification of a 16-hydroxyhexadecanoate ion HO(CH2)15CO2- self-assembled monolayer with 1,2-bis(triethoxysilyl)ethane (C2H5O) 3Si(CH2)2Si(OC2H5) 3 and alkyltriethoxysilane CnH2n + 1Si(OC 2H5)3 (n = 8 or 18). Because crevice corrosion occurred at the initial stage of immersion in the solution preferentially, the edge of electrode covered with the polymer film was coated with epoxy resin. The open-circuit potentials of the covered electrodes in the solution were maintained high, more than -0.2 V/SCE for several hours, indicating that no breakdown of the passive film occurred on the surface. The protective efficiencies of the films were extremely high, more than 99.9% unless the passive film was broken down. The efficiencies after immersion for 24 h almost agreed with those obtained by mass-loss measurements. X-ray photoelectron spectroscopy and electron-probe microanalysis of the passivated surface covered with the polymer film after immersion in the solution for 4 h revealed that pit initiation on the passive film was suppressed by coverage with the polymer film completely.

Original languageEnglish
Pages (from-to)2901-2914
Number of pages14
JournalCorrosion Science
Volume47
Issue number12
DOIs
Publication statusPublished - 2005 Dec 1

Keywords

  • EPMA
  • Iron
  • Passive film
  • Polarization
  • Polymer coatings

ASJC Scopus subject areas

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

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