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The Role of pH on the Inhibition of Aqueous Zinc Corrosion by L-tryptophan / Natalie Wint; James Sullivan; 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...

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Published in: Journal of The Electrochemical Society
ISSN: 0013-4651 1945-7111
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa33650
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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.
Keywords: Corrosion, Inhibitors, Zinc
College: College of Engineering
Issue: 7
Start Page: C356
End Page: C366