Abstract
An iron electrode was modified by electrolytic reduction in deaerated acetonitrile solution of p-toluenediazonium tetrafluoroborate CH3C6H4N2BF4 (TDFB) or p-hydroxymethylbenzenediazonium tetrafluoroborate HOCH2C6H4N2BF4 (HOTDFB) below 10 °C to form a self-assembled monolayer (SAM) of toluene CH3C6H4- or hydroxymethylbenzene HOCH2C6H4- (HOMB) moiety, probably adsorbed on the electrode by the formation of a covalent bond between carbon and iron atoms, as shown in references. The protective ability of the layer was examined by polarization measurement of the electrode in an aerated 0.5 M NaCl solution. The protective efficiencies of these two SAMs were not high, around 30%, a little higher than that of the toluenethiol CH3C6H4SH SAM which was anchored on iron via a coordinate bond between sulfur and iron atoms. The iron surfaces modified with TDFB and HOTDFB were characterized by contact angle measurement, FTIR reflection spectroscopy and X-ray photoelectron spectroscopy. The persistence in protection of iron against corrosion by coverage with the HOMB SAM was confirmed by polarization measurements after immersion in 0.5 M NaCl for a long period of the time.
Original language | English |
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Pages (from-to) | 1378-1393 |
Number of pages | 16 |
Journal | Corrosion Science |
Volume | 49 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2007 Mar 1 |
Keywords
- A. Iron
- B. Contact angle measurement
- B. Polarization
- C. Covalent adsorption bond
- C. Self-assembled monolayer
ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)
- Materials Science(all)