Protection of iron against corrosion by coverage with ultrathin two-dimensional polymer films of a hydroxymethylbenzene self-assembled monolayer anchored by the formation of a covalent bond

Tadashi Shimura, Kunitsugu Aramaki

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Ultrathin films of two-dimensional polymers were prepared on an iron electrode by modification of a p-hydroxymethylbenzene p-HOCH2C6H4 (HOMB) self-assembled monolayer (SAM) with 1,2-bis(triethoxysilyl)ethane (C2H5O)3Si(CH2)2Si(OC2H5)3 (BTESE) and alkyltriethoxysilanes CnH2n+1Si(OC2H5)3 (CnTES, n = 8 and 18). The electrode was derivatized by cathodic reduction of p-hydroxymethylbenzenediazonium tetrafluoroborate HOCH2C6H4N2BF4 in an electrolytic acetonitrile solution below 10 °C for 1 h to form the SAM via a covalent bond between carbon and iron atoms. The protective ability of the polymer film against iron corrosion was determined by polarization measurement of the coated electrode in an oxygenated 0.5 M NaCl solution. The protective efficiencies of the polymer films prepared by modification with BTESE plus C8TES and C18TES were 63.9% and 68.5% after immersion in 0.5 M NaCl for 1.5 h, respectively. These values were higher than those of the one-dimensional polymer films prepared with the respective CnTES. The film of the HOMB SAM modified with BTESE plus C8TES was characterized by contact angle measurement using a drop of water and X-ray photoelectron and FTIR reflection spectroscopies. The films of the HOMB SAM modified with BTESE plus C8TES and C18TES were persistent during immersion of the coated electrodes in 0.5 M NaCl for many hours by far as compared with the alkanethiol SAM anchored on iron by the formation of a coordinate bond.

Original languageEnglish
Pages (from-to)292-300
Number of pages9
JournalCorrosion Science
Volume50
Issue number1
DOIs
Publication statusPublished - 2008 Jan 1

Keywords

  • A. Iron
  • B. Polarization
  • C. Covalent adsorption
  • C. Self-assembled monolayer
  • C. Two-dimensional polymer coatings

ASJC Scopus subject areas

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

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