Inhibition effects of N,N-dimethylalkylamines and octanethiol on iron corrosion in anhydrous acetonitrile solution containing FeCl{sub 3}
Journal Article
·
· Journal of the Electrochemical Society
Polarization and impedance measurements were carried out on an iron electrode in an anhydrous acetonitrile solution of 0.1 M LiClO{sub 4} and 0.01 M FeCl{sub 3} containing organic corrosion inhibitors. The inhibitors investigated were N,N-dimethylalkylamines C{sub n}H{sub 2n+1}N(CH{sub 3}){sub 2} (C{sub n}DMA, n = 8, 12, 16, and 18) and octanethiol C{sub 8}H{sub 17}SH (C{sub 8}T). These compounds suppressed both cathodic and anodic processes of iron corrosion in the acetonitrile solution. The double-layer capacitances obtained from impedance data for the electrode inhibited with C{sub n}DMA were markedly lower in the potential region of the cathodic polarization curve than those for the uninhibited electrode. Ultraviolet and visible spectra of the FeCl{sub 3} acetonitrile solution containing C{sub n}DMA revealed the formation of a Fe{sup 3+} complex cation with C{sub n}DMA, and joint adsorption of the complex cation with Cl{sup {minus}} on the iron surface was substantiated by X-ray photoelectron spectroscopy of the surface treated with the solution. A surface thiolate of C{sub 8}T was formed by its chemisorption on the iron surface, resulting in a decrease in the double-layer capacitance and the cathodic and anodic current densities, respectively.
- Research Organization:
- Keio Univ., Yokohoma (JP)
- OSTI ID:
- 20080571
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 147; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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