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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

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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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first_indexed 2017-05-11T13:12:34Z
last_indexed 2020-12-19T03:51:23Z
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spelling 2020-12-18T15:05:17.3861401 v2 33650 2017-05-11 The Role of pH on the Inhibition of Aqueous Zinc Corrosion by L-tryptophan 5be5dcc4b97c78b3063e258add4fff5c Natalie Wint Natalie Wint true false 40e32d66748ab74184a31207ab145708 0000-0003-1018-773X James Sullivan James Sullivan true false 869becc35438853f2bca0044df467631 0000-0002-8942-8067 David Penney David Penney true false 2017-05-11 FGSEN 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. Journal Article Journal of The Electrochemical Society 164 7 C356 C366 0013-4651 1945-7111 Corrosion, Inhibitors, Zinc 31 12 2017 2017-12-31 10.1149/2.0981707jes COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2020-12-18T15:05:17.3861401 2017-05-11T09:38:53.1559893 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Natalie Wint 1 James Sullivan 0000-0003-1018-773X 2 David Penney 0000-0002-8942-8067 3 0033650-11052017094010.pdf wint2017.pdf 2017-05-11T09:40:10.9070000 Output 3441580 application/pdf Accepted Manuscript true 2017-05-11T00:00:00.0000000 true eng
title The Role of pH on the Inhibition of Aqueous Zinc Corrosion by L-tryptophan
spellingShingle The Role of pH on the Inhibition of Aqueous Zinc Corrosion by L-tryptophan
Natalie Wint
James Sullivan
David Penney
title_short The Role of pH on the Inhibition of Aqueous Zinc Corrosion by L-tryptophan
title_full The Role of pH on the Inhibition of Aqueous Zinc Corrosion by L-tryptophan
title_fullStr The Role of pH on the Inhibition of Aqueous Zinc Corrosion by L-tryptophan
title_full_unstemmed The Role of pH on the Inhibition of Aqueous Zinc Corrosion by L-tryptophan
title_sort The Role of pH on the Inhibition of Aqueous Zinc Corrosion by L-tryptophan
author_id_str_mv 5be5dcc4b97c78b3063e258add4fff5c
40e32d66748ab74184a31207ab145708
869becc35438853f2bca0044df467631
author_id_fullname_str_mv 5be5dcc4b97c78b3063e258add4fff5c_***_Natalie Wint
40e32d66748ab74184a31207ab145708_***_James Sullivan
869becc35438853f2bca0044df467631_***_David Penney
author Natalie Wint
James Sullivan
David Penney
author2 Natalie Wint
James Sullivan
David Penney
format Journal article
container_title Journal of The Electrochemical Society
container_volume 164
container_issue 7
container_start_page C356
publishDate 2017
institution Swansea University
issn 0013-4651
1945-7111
doi_str_mv 10.1149/2.0981707jes
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description 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.
published_date 2017-12-31T03:41:40Z
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score 11.012678

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