No Cover Image

Journal article 1150 views 296 downloads

The Role of pH on the Inhibition of Aqueous Zinc Corrosion by L-tryptophan

Natalie Wint, James Sullivan Orcid Logo, David Penney Orcid Logo

Journal of The Electrochemical Society, Volume: 164, Issue: 7, Pages: C356 - C366

Swansea University Authors: Natalie Wint, James Sullivan Orcid Logo, David Penney Orcid Logo

Check full text

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...

Full description

Published in: Journal of The Electrochemical Society
ISSN: 0013-4651 1945-7111
Published: 2017
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa33650
Tags: Add Tag
No Tags, Be the first to tag this record!
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: Faculty of Science and Engineering
Issue: 7
Start Page: C356
End Page: C366

Similar Items