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Reducing the corrosion rate of magnesium via microalloying additions of group 14 and 15 elements

R.L. Liu, J.R. Scully, G. Williams, N. Birbilis, Geraint Williams Orcid Logo

Electrochimica Acta, Volume: 260, Pages: 184 - 195

Swansea University Author: Geraint Williams Orcid Logo

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DOI (Published version): 10.1016/j.electacta.2017.11.062

Abstract

A characteristic of magnesium (Mg) dissolution is that dissolution is accompanied by a concomitant increase in the hydrogen evolution reaction (HER), a phenomenon known as cathodic activation. When magnesium undergoes free corrosion or forced dissolution in response to anodic polarisation, cathodic...

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Published in: Electrochimica Acta
ISSN: 0013-4686
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa36722
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spelling 2020-09-22T10:47:29.4975973 v2 36722 2017-11-13 Reducing the corrosion rate of magnesium via microalloying additions of group 14 and 15 elements 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 2017-11-13 MTLS A characteristic of magnesium (Mg) dissolution is that dissolution is accompanied by a concomitant increase in the hydrogen evolution reaction (HER), a phenomenon known as cathodic activation. When magnesium undergoes free corrosion or forced dissolution in response to anodic polarisation, cathodic activation is manifest, which allows magnesium dissolution to readily proceed. However, recent work revealed that alloying magnesium with micro additions of arsenic, As (a group 15 element) was capable of retarding cathodic activation, resulting in a significant reduction in the corrosion rate of Mg-As alloys. As such, in the pursuit of elements with similar chemical and electrochemical properties to arsenic, but with less toxicity, a number of group 14 and 15 elements were alloyed with magnesium and reported herein. Based on the binary alloying additions studied herein, it was revealed that Bi, Ge, Pb, Sb and Sn, demonstrated suppression of cathodic activation of Mg following anodic polarisation (about one order of magnitude lower based on the cyclic galvanostatic-potentiostatic testing), in addition to lower free corrosion rates (about one order of magnitude based on the mass loss and hydrogen evolution testing). Employing a number of corrosion rate assessments, including online atomic emission spectroelectrochemistry, it was shown that reduction in Mg corrosion rates – historically considered difficult to achieve – can be robustly demonstrated. The present work has implications for the development of more corrosion resistant Mg alloys, Mg anodes for cathodic protection, or for the use of Mg as a primary battery electrode. Journal Article Electrochimica Acta 260 184 195 0013-4686 Magnesium; Corrosion; Cathodic activation; Magnesium alloys; ICP 31 12 2018 2018-12-31 10.1016/j.electacta.2017.11.062 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-09-22T10:47:29.4975973 2017-11-13T09:40:08.5567146 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering R.L. Liu 1 J.R. Scully 2 G. Williams 3 N. Birbilis 4 Geraint Williams 0000-0002-3399-5142 5 0036722-13112017094300.pdf liu2017(4).pdf 2017-11-13T09:43:00.5800000 Output 1329384 application/pdf Accepted Manuscript true 2018-11-11T00:00:00.0000000 true eng
title Reducing the corrosion rate of magnesium via microalloying additions of group 14 and 15 elements
spellingShingle Reducing the corrosion rate of magnesium via microalloying additions of group 14 and 15 elements
Geraint Williams
title_short Reducing the corrosion rate of magnesium via microalloying additions of group 14 and 15 elements
title_full Reducing the corrosion rate of magnesium via microalloying additions of group 14 and 15 elements
title_fullStr Reducing the corrosion rate of magnesium via microalloying additions of group 14 and 15 elements
title_full_unstemmed Reducing the corrosion rate of magnesium via microalloying additions of group 14 and 15 elements
title_sort Reducing the corrosion rate of magnesium via microalloying additions of group 14 and 15 elements
author_id_str_mv 0d8fc8d44e2a3c88ce61832f66f20d82
author_id_fullname_str_mv 0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint Williams
author Geraint Williams
author2 R.L. Liu
J.R. Scully
G. Williams
N. Birbilis
Geraint Williams
format Journal article
container_title Electrochimica Acta
container_volume 260
container_start_page 184
publishDate 2018
institution Swansea University
issn 0013-4686
doi_str_mv 10.1016/j.electacta.2017.11.062
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 characteristic of magnesium (Mg) dissolution is that dissolution is accompanied by a concomitant increase in the hydrogen evolution reaction (HER), a phenomenon known as cathodic activation. When magnesium undergoes free corrosion or forced dissolution in response to anodic polarisation, cathodic activation is manifest, which allows magnesium dissolution to readily proceed. However, recent work revealed that alloying magnesium with micro additions of arsenic, As (a group 15 element) was capable of retarding cathodic activation, resulting in a significant reduction in the corrosion rate of Mg-As alloys. As such, in the pursuit of elements with similar chemical and electrochemical properties to arsenic, but with less toxicity, a number of group 14 and 15 elements were alloyed with magnesium and reported herein. Based on the binary alloying additions studied herein, it was revealed that Bi, Ge, Pb, Sb and Sn, demonstrated suppression of cathodic activation of Mg following anodic polarisation (about one order of magnitude lower based on the cyclic galvanostatic-potentiostatic testing), in addition to lower free corrosion rates (about one order of magnitude based on the mass loss and hydrogen evolution testing). Employing a number of corrosion rate assessments, including online atomic emission spectroelectrochemistry, it was shown that reduction in Mg corrosion rates – historically considered difficult to achieve – can be robustly demonstrated. The present work has implications for the development of more corrosion resistant Mg alloys, Mg anodes for cathodic protection, or for the use of Mg as a primary battery electrode.
published_date 2018-12-31T03:46:02Z
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score 10.99807

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