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The Performance of Novel Cr(III) Based Coatings for Packaging Steel / ELLEN BLUETT

Swansea University Author: ELLEN BLUETT

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DOI (Published version): 10.23889/SUthesis.65166

Abstract

The main driver for this thesis was the understanding of the mechanisms involved in the corrosion of novel trivalent chromium coatings for packaging steels and comparison with traditional materials, namely electro chromium coated steel (ECCS). Tata Steel are currently developing trivalent chromium c...

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Published: Swansea, Wales, UK 2023
Institution: Swansea University
Degree level: Doctoral
Degree name: EngD
Supervisor: Wint, Natalie. and Edy, James.
URI: https://cronfa.swan.ac.uk/Record/cronfa65166
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first_indexed 2023-11-30T12:59:53Z
last_indexed 2023-11-30T12:59:53Z
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spelling v2 65166 2023-11-30 The Performance of Novel Cr(III) Based Coatings for Packaging Steel 4eb218b60da364ecbac1c7abb6452f2a ELLEN BLUETT ELLEN BLUETT true false 2023-11-30 The main driver for this thesis was the understanding of the mechanisms involved in the corrosion of novel trivalent chromium coatings for packaging steels and comparison with traditional materials, namely electro chromium coated steel (ECCS). Tata Steel are currently developing trivalent chromium coated technology steel (TCCT) as a replacement for ECCS in steel packaging applications. ECCS offers excellent corrosion resistance when used in conjunction with a polymer overcoat. The understanding of corrosion performance of the novel TCCT when overcoated with an organic coating is currently limited. Thus, this work utilised experimental procedures to help understand the mechanism behind two forms of corrosion-driven organic coating failure; filiform corrosion and corrosion-driven cathodic delamination. In turn, this work also aimed to identify, and supply the steel industry with evidence of the TCCT coating weights that are important for optimum resistance to organic coating failure. Increasing the Cr (III) oxide coating weight led to an improvement in corrosion performance with regards to both filiform corrosion and cathodic delamination, with a Cr (III) oxide coating weight of approximately 7 mg.m-2 providing impressive corrosion resistance, comparable to that of the current standard, ECCS. The increased presence of defects on TCCT samples with lower Cr (III) oxide coating weights, as well as the impressive insulating properties of Cr (III) oxide, were thought to be contributing factors to the improved corrosion resistance observed with increasing coating weight. Furthermore, a lab-scale TCCT electroplating line was successfully replicated in the Swansea labs. Varying parameters including current density and temperature had a profound effect on the amount of Cr deposited. Hydrogen evolution was proposed to be one of the reasons for this variance in deposit. E-Thesis Swansea, Wales, UK Corrosion, Packaging Steel, Trivalent Chromium 7 11 2023 2023-11-07 10.23889/SUthesis.65166 COLLEGE NANME COLLEGE CODE Swansea University Wint, Natalie. and Edy, James. Doctoral EngD Tata Steel, WEFO, EPSRC, Welsh Government Tata Steel, WEFO, EPSRC, Welsh Government 2023-11-30T13:11:05.7924475 2023-11-30T12:47:52.6050370 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering ELLEN BLUETT 1 65166__29159__7be904d3b0fb4ec5a161ab9b2de015eb.pdf 2023_Bluett_E.final.65166.pdf 2023-11-30T13:00:35.9022692 Output 12848258 application/pdf E-Thesis – open access true © Ellen C. Bluett 2023. Distributed under the terms of a Creative Commons Attribution Non Commercial 4.0 License (CC BY-NC 4.0). true eng https://creativecommons.org/licenses/by-nc/4.0/
title The Performance of Novel Cr(III) Based Coatings for Packaging Steel
spellingShingle The Performance of Novel Cr(III) Based Coatings for Packaging Steel
ELLEN BLUETT
title_short The Performance of Novel Cr(III) Based Coatings for Packaging Steel
title_full The Performance of Novel Cr(III) Based Coatings for Packaging Steel
title_fullStr The Performance of Novel Cr(III) Based Coatings for Packaging Steel
title_full_unstemmed The Performance of Novel Cr(III) Based Coatings for Packaging Steel
title_sort The Performance of Novel Cr(III) Based Coatings for Packaging Steel
author_id_str_mv 4eb218b60da364ecbac1c7abb6452f2a
author_id_fullname_str_mv 4eb218b60da364ecbac1c7abb6452f2a_***_ELLEN BLUETT
author ELLEN BLUETT
author2 ELLEN BLUETT
format E-Thesis
publishDate 2023
institution Swansea University
doi_str_mv 10.23889/SUthesis.65166
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 The main driver for this thesis was the understanding of the mechanisms involved in the corrosion of novel trivalent chromium coatings for packaging steels and comparison with traditional materials, namely electro chromium coated steel (ECCS). Tata Steel are currently developing trivalent chromium coated technology steel (TCCT) as a replacement for ECCS in steel packaging applications. ECCS offers excellent corrosion resistance when used in conjunction with a polymer overcoat. The understanding of corrosion performance of the novel TCCT when overcoated with an organic coating is currently limited. Thus, this work utilised experimental procedures to help understand the mechanism behind two forms of corrosion-driven organic coating failure; filiform corrosion and corrosion-driven cathodic delamination. In turn, this work also aimed to identify, and supply the steel industry with evidence of the TCCT coating weights that are important for optimum resistance to organic coating failure. Increasing the Cr (III) oxide coating weight led to an improvement in corrosion performance with regards to both filiform corrosion and cathodic delamination, with a Cr (III) oxide coating weight of approximately 7 mg.m-2 providing impressive corrosion resistance, comparable to that of the current standard, ECCS. The increased presence of defects on TCCT samples with lower Cr (III) oxide coating weights, as well as the impressive insulating properties of Cr (III) oxide, were thought to be contributing factors to the improved corrosion resistance observed with increasing coating weight. Furthermore, a lab-scale TCCT electroplating line was successfully replicated in the Swansea labs. Varying parameters including current density and temperature had a profound effect on the amount of Cr deposited. Hydrogen evolution was proposed to be one of the reasons for this variance in deposit.
published_date 2023-11-07T13:11:06Z
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score 11.012678

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