Protection of passivated iron against corrosion in a 0.1 M NaNO3 solution by coverage with an ultrathin polymer coating of carboxylate SAM

Kunitsugu Aramaki, Tadashi Shimura

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

An ultrathin, ordered and two-dimensional polymer coating was prepared on passivated iron by modification of 16-hydroxyhexadecanoate ion HO(CH2)15CO2 - self-assembled monolayer (SAM) with 1,2-bis(triethoxysilyl)ethane (C2H5O)3Si(CH2)2Si(OC2H5)3 and octadecyltriethoxysilane C18H37Si(OC2H5)3. Protection of passivated iron against passive film breakdown and corrosion of iron was examined by monitoring of the open-circuit potential and repeated polarization measurements in an aerated 0.1 M NaNO3 solution during immersion for many hours. Passive film breakdown on the polymer-coated electrode in the solution was not observed during immersion for 480 h, whereas that of the passivated one occurred at 18.1 h, indicating protection of the passive film from breakdown by coverage with the polymer coating. The protective efficiencies of the passive film covered with the coating were extremely high, around 99.9% in the initial region of the immersion time up to 72 h and more than 98.3% thereafter, indicating prominent cooperative suppression of iron corrosion in 0.1 M NaNO3 by coverage with the passive film and polymer coating. The polymer-coated surface was characterized by contact angle measurement and electron-probe microanalysis.

Original languageEnglish
Pages (from-to)1887-1893
Number of pages7
JournalCorrosion Science
Volume51
Issue number9
DOIs
Publication statusPublished - 2009 Sep

Fingerprint

Self assembled monolayers
Polymers
Iron
Corrosion
Coatings
Electron probe microanalysis
Angle measurement
Ethane
Contact angle
Ions
Polarization
Electrodes
Networks (circuits)
Monitoring

Keywords

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

ASJC Scopus subject areas

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

Cite this

Protection of passivated iron against corrosion in a 0.1 M NaNO3 solution by coverage with an ultrathin polymer coating of carboxylate SAM. / Aramaki, Kunitsugu; Shimura, Tadashi.

In: Corrosion Science, Vol. 51, No. 9, 09.2009, p. 1887-1893.

Research output: Contribution to journalArticle

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