Abstract
An ultrathin and ordered polymer coating was prepared on a passivated iron 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 octyltriethoxysilane C8H17Si(OC2H5)3. Further, the passivated and polymer-coated electrode was healed by treatment in 1.0M NaNO3 for 4h. Prevention of passive film breakdown and iron corrosion for the passivated, polymer-coated and healed electrode was examined by monitoring of the open-circuit potential and repeated polarization measurements in oxygenated 0.1M KClO4, 0.1M Na2SO4 and 0.1M NaCl for many hours. The values of the time for passive film breakdown, tbd were >240, 22.2 and 9.5h in these solutions, respectively. The protective efficiencies for the electrode were extremely high, more than 99.9% before tbd, indicating complete protection of substrate iron against corrosion in these solutions, unless passive film breakdown occurred. The presence of NO3- on the passive surface by treatment in 1.0M NaNO3 was detected by X-ray photoelectron and FTIR reflection spectroscopies. The self-healing activity of adsorbed NO3- to suppress passive film breakdown was discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 4152-4158 |
| Number of pages | 7 |
| Journal | Corrosion Science |
| Volume | 53 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2011 Dec |
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Keywords
- A. Iron
- B. Polarization
- C. Neutral inhibition
- C. Passive films
- C. Polymer coatings
ASJC Scopus subject areas
- Materials Science(all)
- Chemical Engineering(all)
- Chemistry(all)
Cite this
Improvement of healing treatment with NaNO3 for a passivated iron electrode covered with an ultrathin polymer coating to prevent iron corrosion in some solutions containing aggressive anions. / Aramaki, Kunitsugu; Shimura, Tadashi.
In: Corrosion Science, Vol. 53, No. 12, 12.2011, p. 4152-4158.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Improvement of healing treatment with NaNO3 for a passivated iron electrode covered with an ultrathin polymer coating to prevent iron corrosion in some solutions containing aggressive anions
AU - Aramaki, Kunitsugu
AU - Shimura, Tadashi
PY - 2011/12
Y1 - 2011/12
N2 - An ultrathin and ordered polymer coating was prepared on a passivated iron 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 octyltriethoxysilane C8H17Si(OC2H5)3. Further, the passivated and polymer-coated electrode was healed by treatment in 1.0M NaNO3 for 4h. Prevention of passive film breakdown and iron corrosion for the passivated, polymer-coated and healed electrode was examined by monitoring of the open-circuit potential and repeated polarization measurements in oxygenated 0.1M KClO4, 0.1M Na2SO4 and 0.1M NaCl for many hours. The values of the time for passive film breakdown, tbd were >240, 22.2 and 9.5h in these solutions, respectively. The protective efficiencies for the electrode were extremely high, more than 99.9% before tbd, indicating complete protection of substrate iron against corrosion in these solutions, unless passive film breakdown occurred. The presence of NO3- on the passive surface by treatment in 1.0M NaNO3 was detected by X-ray photoelectron and FTIR reflection spectroscopies. The self-healing activity of adsorbed NO3- to suppress passive film breakdown was discussed.
AB - An ultrathin and ordered polymer coating was prepared on a passivated iron 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 octyltriethoxysilane C8H17Si(OC2H5)3. Further, the passivated and polymer-coated electrode was healed by treatment in 1.0M NaNO3 for 4h. Prevention of passive film breakdown and iron corrosion for the passivated, polymer-coated and healed electrode was examined by monitoring of the open-circuit potential and repeated polarization measurements in oxygenated 0.1M KClO4, 0.1M Na2SO4 and 0.1M NaCl for many hours. The values of the time for passive film breakdown, tbd were >240, 22.2 and 9.5h in these solutions, respectively. The protective efficiencies for the electrode were extremely high, more than 99.9% before tbd, indicating complete protection of substrate iron against corrosion in these solutions, unless passive film breakdown occurred. The presence of NO3- on the passive surface by treatment in 1.0M NaNO3 was detected by X-ray photoelectron and FTIR reflection spectroscopies. The self-healing activity of adsorbed NO3- to suppress passive film breakdown was discussed.
KW - A. Iron
KW - B. Polarization
KW - C. Neutral inhibition
KW - C. Passive films
KW - C. Polymer coatings
UR - http://www.scopus.com/inward/record.url?scp=80053457850&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80053457850&partnerID=8YFLogxK
U2 - 10.1016/j.corsci.2011.08.025
DO - 10.1016/j.corsci.2011.08.025
M3 - Article
AN - SCOPUS:80053457850
VL - 53
SP - 4152
EP - 4158
JO - Corrosion Science
JF - Corrosion Science
SN - 0010-938X
IS - 12
ER -