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The Role of pH on the Inhibition of Aqueous Zinc Corrosion by L-tryptophan
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David Penney
Journal of The Electrochemical Society, Volume: 164, Issue: 7, Pages: C356 - C366
Swansea University Authors:
Natalie Wint, James Sullivan , David Penney
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DOI (Published version): 10.1149/2.0981707jes
Abstract
A combination of in situ Scanning Vibrating Electrode Technique (SVET), and time lapse photography were used to investigate the influence of the amino acid, L-tryptophan, on the localized corrosion occurring on unpolarized zinc (Zn) samples immersed in a 0.17 mol.L−1 aqueous sodium chloride electrol...
| Published in: | Journal of The Electrochemical Society |
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| ISSN: | 0013-4651 1945-7111 |
| Published: |
2017
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa33650 |
| Abstract: |
A combination of in situ Scanning Vibrating Electrode Technique (SVET), and time lapse photography were used to investigate the influence of the amino acid, L-tryptophan, on the localized corrosion occurring on unpolarized zinc (Zn) samples immersed in a 0.17 mol.L−1 aqueous sodium chloride electrolyte. The addition of 1 × 10−2 mol.L−1 of L-tryptophan was found to have a significant effect on the corrosion rate for all pH values tested. At both pH 2 and pH 7, primary protection was suggested to occur as a result of adsorption due to electrostatic interactions. A secondary mechanism, whereby an insoluble complex is formed between Zn (II) ions and anionic L-tryptophan, was also proposed to occur at areas of localized high pH. At pH 2 the additions resulted in an 88% decrease in mass loss, as measured by gravimetric mass loss results and SVET, demonstrating the effectiveness of L-tryptophan inhibitors for this material. |
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| Keywords: |
Corrosion, Inhibitors, Zinc |
| College: |
Faculty of Science and Engineering |
| Issue: |
7 |
| Start Page: |
C356 |
| End Page: |
C366 |