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Mechanistic study on the corrosion behaviour of Zinc and Zinc-Calcium alloys designed for enhanced metallic coatings in the presence of chloride and phosphate ions

Amar Malla, James Sullivan Orcid Logo, David Penney Orcid Logo, Tom Dunlop Orcid Logo, P. Barker

Corrosion Science, Volume: 213, Start page: 110956

Swansea University Authors: Amar Malla, James Sullivan Orcid Logo, David Penney Orcid Logo, Tom Dunlop Orcid Logo

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DOI (Published version): 10.1016/j.corsci.2022.110956

Abstract

Additions of 1 wt % Ca were made to Zn (Zn-1Ca) to generate favourable chemical conditions during corrosion for enhanced performance of phosphate inhibitors. Zn-1Ca displayed a reduced corrosion rate in 0.17 M NaCl measured using the Scanning Vibrating Electrode Technique and polarization. In-situ t...

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Published in: Corrosion Science
ISSN: 0010-938X
Published: Elsevier BV 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa62266
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Abstract: Additions of 1 wt % Ca were made to Zn (Zn-1Ca) to generate favourable chemical conditions during corrosion for enhanced performance of phosphate inhibitors. Zn-1Ca displayed a reduced corrosion rate in 0.17 M NaCl measured using the Scanning Vibrating Electrode Technique and polarization. In-situ timelapse microscopy and SEM-EDS demonstrated that intermetallic CaZn13 preferentially corroded releasing Ca2+ that increased corrosion product precipitation, cathodically deactivating the system. 1 ×10-3 mol.dm-3 phosphate additions to 0.17 M NaCl decreased the corrosion rate of Zn and Zn-1Ca. Inhibition was greater for Zn-1Ca where uniform precipitation of mixed metal phosphates produced anodic and cathodic inhibition.
Keywords: Zinc; Calcium; Phosphate; inhibitor; SVET; Time-lapse microscopy
College: Faculty of Science and Engineering
Funders: The authors would like to thank EPSRC (Grant Code: EP/L015099/1) for funding via the COATED 2 Centre for Doctoral Training and WEFO-funded Materials & Manufacturing Academy (M2A) at Swansea University.
Start Page: 110956

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