Journal article 1288 views 326 downloads
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
,
James Sullivan ,
David Penney ,
Tom Dunlop ,
P. Barker
Corrosion Science, Volume: 213, Start page: 110956
Swansea University Authors:
Amar Malla , James Sullivan , David Penney , Tom Dunlop
-
PDF | Version of Record
© 2023 The Authors. This is an open access article under the CC BY license
Download (23.04MB)
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...
| Published in: | Corrosion Science |
|---|---|
| ISSN: | 0010-938X |
| Published: |
Elsevier BV
2023
|
| Online Access: |
Check full text
|
| URI: | https://cronfa.swan.ac.uk/Record/cronfa62266 |
| 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 |