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Corrosion resistance of novel coatings on packaging steels / JORDAN WHITESIDE

Swansea University Author: JORDAN WHITESIDE

  • Redacted version - open access under embargo until: 25th February 2027

DOI (Published version): 10.23889/SUthesis.59488

Abstract

ECCS (Electrolytically Chromium Coated Steel) is historically made from a Cr(VI) based bath, but REACH legislation makes market expansions following this route restricted. A novel chromium based coating alternative has been developed by Tata Steel using a Cr(III) containing electrolyte. Initial stud...

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Published: Swansea 2022
Institution: Swansea University
Degree level: Doctoral
Degree name: EngD
Supervisor: Sackett, Elizabeth ; Williams, Geraint
URI: https://cronfa.swan.ac.uk/Record/cronfa59488
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first_indexed 2022-03-03T16:35:58Z
last_indexed 2022-03-04T04:28:44Z
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spelling 2022-03-03T16:43:41.8340658 v2 59488 2022-03-03 Corrosion resistance of novel coatings on packaging steels 1a86fe7741e101bc7050460df358eb6e JORDAN WHITESIDE JORDAN WHITESIDE true false 2022-03-03 ECCS (Electrolytically Chromium Coated Steel) is historically made from a Cr(VI) based bath, but REACH legislation makes market expansions following this route restricted. A novel chromium based coating alternative has been developed by Tata Steel using a Cr(III) containing electrolyte. Initial studies were undertaken to understand the relationship between deformation of the packaging steels and the resultant impact on corrosion performance. An organic overcoat (PVB) was applied to strained samples and an in-situ scanning Kelvin probe technique (SKP) was used to determine rates of PVB cathodic disbondment. The Cr(VI) derived coatings were fully resistant to cathodic disbondment post-deformation. The Cr(III) derived coatings exhibited increased rates of cathodic disbondment with increasing uniaxial strain. Enhancements of the Cr(III) based coating were explored using a citric acid passivation treatment. SVET (scanning vibrating electrode technique) was used to study aqueous corrosion mechanisms and time lapse photography was utilized to measure PVB cathodic disbondment on the Cr(III) coated substrate. The best performance for localised corrosion was identified at a passivation time of 5 minutes. However, 15 minutes of treatment produced improvements in suppressing cathodic disbondment rates of the PVB overcoat. The primary mechanisms for the passivation treatment with citric acid was identified as chromium oxidation and the dissolution of surface iron. Prolonged exposure to citric acid incurred a detrimental effect in aqueous corrosion circumstances, however an enhanced performance during cathodic disbondment studies. The influence of changes in total chromium coating weight and chromium oxide levels on corrosion resistance were studied, revealing a correlation between higher coating weights and resistance to filiform corrosion. SVET experiments revealed the resistance to localised corrosion activity was not dependent on total coating weight, but the levels of chromium oxide on the Cr(III) coating. E-Thesis Swansea Steel, Chromium, Cathodic disbondment, Filiform Corrosion, Packaging steels, Uniaxial deformation 3 3 2022 2022-03-03 10.23889/SUthesis.59488 A selection of third party content is redacted or is partially redacted from this thesis due to copyright restrictions. COLLEGE NANME COLLEGE CODE Swansea University Sackett, Elizabeth ; Williams, Geraint Doctoral EngD TATA Steel Packaging Europe; Welsh European Funding Office (WEFO); EPSRC ; Research grant number European Social Fund via the Welsh Government (<GN3>c80816<GN3>) and the Engineering and Physical Sciences Research Council (Grant Ref: EP/L015099/1). 2022-03-03T16:43:41.8340658 2022-03-03T16:07:41.5978086 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised JORDAN WHITESIDE 1 Under embargo Under embargo 2022-03-03T16:34:53.3904288 Output 15792265 application/pdf Redacted version - open access true 2027-02-25T00:00:00.0000000 Corrosion resistance of novel coatings on packaging steels © 2022 by Jordan W.J. Whiteside is licensed under a Creative Commons Attribution-Non-Commercial No–Derivatives (CC-BY-NC-ND) license. true eng https://creativecommons.org/licenses/by-nc-nd/4.0/
title Corrosion resistance of novel coatings on packaging steels
spellingShingle Corrosion resistance of novel coatings on packaging steels
JORDAN WHITESIDE
title_short Corrosion resistance of novel coatings on packaging steels
title_full Corrosion resistance of novel coatings on packaging steels
title_fullStr Corrosion resistance of novel coatings on packaging steels
title_full_unstemmed Corrosion resistance of novel coatings on packaging steels
title_sort Corrosion resistance of novel coatings on packaging steels
author_id_str_mv 1a86fe7741e101bc7050460df358eb6e
author_id_fullname_str_mv 1a86fe7741e101bc7050460df358eb6e_***_JORDAN WHITESIDE
author JORDAN WHITESIDE
author2 JORDAN WHITESIDE
format E-Thesis
publishDate 2022
institution Swansea University
doi_str_mv 10.23889/SUthesis.59488
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 - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 0
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description ECCS (Electrolytically Chromium Coated Steel) is historically made from a Cr(VI) based bath, but REACH legislation makes market expansions following this route restricted. A novel chromium based coating alternative has been developed by Tata Steel using a Cr(III) containing electrolyte. Initial studies were undertaken to understand the relationship between deformation of the packaging steels and the resultant impact on corrosion performance. An organic overcoat (PVB) was applied to strained samples and an in-situ scanning Kelvin probe technique (SKP) was used to determine rates of PVB cathodic disbondment. The Cr(VI) derived coatings were fully resistant to cathodic disbondment post-deformation. The Cr(III) derived coatings exhibited increased rates of cathodic disbondment with increasing uniaxial strain. Enhancements of the Cr(III) based coating were explored using a citric acid passivation treatment. SVET (scanning vibrating electrode technique) was used to study aqueous corrosion mechanisms and time lapse photography was utilized to measure PVB cathodic disbondment on the Cr(III) coated substrate. The best performance for localised corrosion was identified at a passivation time of 5 minutes. However, 15 minutes of treatment produced improvements in suppressing cathodic disbondment rates of the PVB overcoat. The primary mechanisms for the passivation treatment with citric acid was identified as chromium oxidation and the dissolution of surface iron. Prolonged exposure to citric acid incurred a detrimental effect in aqueous corrosion circumstances, however an enhanced performance during cathodic disbondment studies. The influence of changes in total chromium coating weight and chromium oxide levels on corrosion resistance were studied, revealing a correlation between higher coating weights and resistance to filiform corrosion. SVET experiments revealed the resistance to localised corrosion activity was not dependent on total coating weight, but the levels of chromium oxide on the Cr(III) coating.
published_date 2022-03-03T04:16:50Z
_version_ 1763754126194245632
score 11.037581

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