Abstract
The film thickness, d of a p-hydroxymethylbenzene - C6H4CH2OH (HOMB) self-assembled monolayer (SAM) adsorbed on iron via a covalent bond was increased by multistep modification with tetraethoxysilane (C2H5O)4Si (TES) and 1,8-octanediol HO(CH2)8OH (C8DO) and subsequently with 1,2-bis(triethoxysilyl)ethane (C2H5O)3Si(CH2)2Si(OC2H5)3 (BTESE) and akyltriethoxysilane CnH2n+1Si(OC2H5)3 (CnTES, n = 8 or 18). The protective ability of the film against iron corrosion was examined by polarization measurement of the iron electrode coated with the film in an oxygenated 0.5 M NaCl after immersion in the solution for many hours. The values of protective efficiency, P for the films, the HOMB SAM modified with TES and C8DO twice and subsequently with BTESE and CnTES were high, more than 81% at n = 8 and 85% at n = 18 in the range of the immersion time, t up to 240 h, respectively. The maximal P values of the respective films were 88.0% and 92.2%, of which approximate d values were 4.6 and 5.8 nm. The high protection of iron against corrosion was attributed to increases in the film thickness and interconnection between the adsorbed molecules with Si-O polymer linkages. The protective ability of the film was remarkably persistent during immersion in the solution for many hours. A slight enhancement of P was observed by additional modification of the modified HOMB SAM with C8TES due to increases in interconnection and close packed arrangement. The formation of strong adsorption bonds, σ-covalent bond and back-donating π-bond, between the carbon atom of HOMB moiety and iron atom was discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 2407-2414 |
| Number of pages | 8 |
| Journal | Corrosion Science |
| Volume | 50 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2008 Aug |
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Keywords
- A. Iron
- B. Polarization
- C. Covalent-bonded self-assembled monolayer
- C. Film thickness
- C. Organic polymer coatings
ASJC Scopus subject areas
- Materials Science(all)
- Metals and Alloys
Cite this
Preparation of ultrathin polymer coatings adsorbed on iron via a covalent bond by multistep modification of a hydroxymethylbenzene SAM with ethoxysilanes and alkanediol for preventing iron corrosion in 0.5 M NaCl. / Shimura, Tadashi; Aramaki, Kunitsugu.
In: Corrosion Science, Vol. 50, No. 8, 08.2008, p. 2407-2414.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Preparation of ultrathin polymer coatings adsorbed on iron via a covalent bond by multistep modification of a hydroxymethylbenzene SAM with ethoxysilanes and alkanediol for preventing iron corrosion in 0.5 M NaCl
AU - Shimura, Tadashi
AU - Aramaki, Kunitsugu
PY - 2008/8
Y1 - 2008/8
N2 - The film thickness, d of a p-hydroxymethylbenzene - C6H4CH2OH (HOMB) self-assembled monolayer (SAM) adsorbed on iron via a covalent bond was increased by multistep modification with tetraethoxysilane (C2H5O)4Si (TES) and 1,8-octanediol HO(CH2)8OH (C8DO) and subsequently with 1,2-bis(triethoxysilyl)ethane (C2H5O)3Si(CH2)2Si(OC2H5)3 (BTESE) and akyltriethoxysilane CnH2n+1Si(OC2H5)3 (CnTES, n = 8 or 18). The protective ability of the film against iron corrosion was examined by polarization measurement of the iron electrode coated with the film in an oxygenated 0.5 M NaCl after immersion in the solution for many hours. The values of protective efficiency, P for the films, the HOMB SAM modified with TES and C8DO twice and subsequently with BTESE and CnTES were high, more than 81% at n = 8 and 85% at n = 18 in the range of the immersion time, t up to 240 h, respectively. The maximal P values of the respective films were 88.0% and 92.2%, of which approximate d values were 4.6 and 5.8 nm. The high protection of iron against corrosion was attributed to increases in the film thickness and interconnection between the adsorbed molecules with Si-O polymer linkages. The protective ability of the film was remarkably persistent during immersion in the solution for many hours. A slight enhancement of P was observed by additional modification of the modified HOMB SAM with C8TES due to increases in interconnection and close packed arrangement. The formation of strong adsorption bonds, σ-covalent bond and back-donating π-bond, between the carbon atom of HOMB moiety and iron atom was discussed.
AB - The film thickness, d of a p-hydroxymethylbenzene - C6H4CH2OH (HOMB) self-assembled monolayer (SAM) adsorbed on iron via a covalent bond was increased by multistep modification with tetraethoxysilane (C2H5O)4Si (TES) and 1,8-octanediol HO(CH2)8OH (C8DO) and subsequently with 1,2-bis(triethoxysilyl)ethane (C2H5O)3Si(CH2)2Si(OC2H5)3 (BTESE) and akyltriethoxysilane CnH2n+1Si(OC2H5)3 (CnTES, n = 8 or 18). The protective ability of the film against iron corrosion was examined by polarization measurement of the iron electrode coated with the film in an oxygenated 0.5 M NaCl after immersion in the solution for many hours. The values of protective efficiency, P for the films, the HOMB SAM modified with TES and C8DO twice and subsequently with BTESE and CnTES were high, more than 81% at n = 8 and 85% at n = 18 in the range of the immersion time, t up to 240 h, respectively. The maximal P values of the respective films were 88.0% and 92.2%, of which approximate d values were 4.6 and 5.8 nm. The high protection of iron against corrosion was attributed to increases in the film thickness and interconnection between the adsorbed molecules with Si-O polymer linkages. The protective ability of the film was remarkably persistent during immersion in the solution for many hours. A slight enhancement of P was observed by additional modification of the modified HOMB SAM with C8TES due to increases in interconnection and close packed arrangement. The formation of strong adsorption bonds, σ-covalent bond and back-donating π-bond, between the carbon atom of HOMB moiety and iron atom was discussed.
KW - A. Iron
KW - B. Polarization
KW - C. Covalent-bonded self-assembled monolayer
KW - C. Film thickness
KW - C. Organic polymer coatings
UR - http://www.scopus.com/inward/record.url?scp=50349095556&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=50349095556&partnerID=8YFLogxK
U2 - 10.1016/j.corsci.2008.05.020
DO - 10.1016/j.corsci.2008.05.020
M3 - Article
AN - SCOPUS:50349095556
VL - 50
SP - 2407
EP - 2414
JO - Corrosion Science
JF - Corrosion Science
SN - 0010-938X
IS - 8
ER -