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Biopolymeric Anticorrosion Coatings from Cellulose Nanofibrils and Colloidal Lignin Particles

Arman Dastpak, Philip Ansell, Justin Searle Orcid Logo, Mari Lundström, Benjamin P. Wilson

ACS Applied Materials & Interfaces, Volume: 13, Issue: 34, Pages: 41034 - 41045

Swansea University Authors: Philip Ansell, Justin Searle Orcid Logo

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DOI (Published version): 10.1021/acsami.1c08274

Abstract

This study presents a process for preparation of cellulose–lignin barrier coatings for hot-dip galvanized (HDG) steel by aqueous electrophoretic deposition. Initially, a solution of softwood kraft lignin and diethylene glycol monobutyl ether was used to prepare an aqueous dispersion of colloidal lig...

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Published in: ACS Applied Materials & Interfaces
ISSN: 1944-8244 1944-8252
Published: American Chemical Society (ACS) 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa58100
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Initially, a solution of softwood kraft lignin and diethylene glycol monobutyl ether was used to prepare an aqueous dispersion of colloidal lignin particles (CLPs) via solvent exchange. Analysis of the dispersion showed that it comprised submicron particles (D = 146 nm) with spherical morphologies and colloidal stability (&#x3B6;-potential = &#x2212;40 mV). Following successful formation, the CLP dispersion was mixed with a suspension of TEMPO-oxidized cellulose nanofibers (TOCN, 1 and 2 g&#xB7;L&#x2013;1) at a fixed volumetric ratio (1:1, TOCN&#x2013;CLPs), and biopolymers were deposited onto HDG steel surfaces at different potentials (0.5 and 3 V). The effects of these variables on coating formation, dry adhesion, and electrochemical properties (3.5% NaCl) were investigated. The scanning electron microscopy results showed that coalescence of CLPs occurs during the drying of composite coatings, resulting in formation of a barrier layer on HDG steel. The scanning vibrating electrode technique results demonstrated that the TOCN&#x2013;CLP layers reduced the penetration of the electrolyte (3.5% NaCl) to the metal&#x2013;coating interface for at least 48 h of immersion, with a more prolonged barrier performance for 3 V-deposited coatings. Additional electrochemical impedance spectroscopy studies showed that all four coatings provided increased levels of charge transfer resistance (Rct)&#x2014;compared to bare HDG steel&#x2014;although coatings deposited at a higher potential (3 V) and a higher TOCN concentration provided the maximum charge transfer resistance after 15 days of immersion (13.7 cf. 0.2 k&#x3A9;&#xB7;cm2 for HDG steel). 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spelling 2021-10-22T16:46:12.3396325 v2 58100 2021-09-27 Biopolymeric Anticorrosion Coatings from Cellulose Nanofibrils and Colloidal Lignin Particles 8889433e9478f045d656ce784a9d79ed Philip Ansell Philip Ansell true false 0e3f2c3812f181eaed11c45554d4cdd0 0000-0003-1101-075X Justin Searle Justin Searle true false 2021-09-27 MTLS This study presents a process for preparation of cellulose–lignin barrier coatings for hot-dip galvanized (HDG) steel by aqueous electrophoretic deposition. Initially, a solution of softwood kraft lignin and diethylene glycol monobutyl ether was used to prepare an aqueous dispersion of colloidal lignin particles (CLPs) via solvent exchange. Analysis of the dispersion showed that it comprised submicron particles (D = 146 nm) with spherical morphologies and colloidal stability (ζ-potential = −40 mV). Following successful formation, the CLP dispersion was mixed with a suspension of TEMPO-oxidized cellulose nanofibers (TOCN, 1 and 2 g·L–1) at a fixed volumetric ratio (1:1, TOCN–CLPs), and biopolymers were deposited onto HDG steel surfaces at different potentials (0.5 and 3 V). The effects of these variables on coating formation, dry adhesion, and electrochemical properties (3.5% NaCl) were investigated. The scanning electron microscopy results showed that coalescence of CLPs occurs during the drying of composite coatings, resulting in formation of a barrier layer on HDG steel. The scanning vibrating electrode technique results demonstrated that the TOCN–CLP layers reduced the penetration of the electrolyte (3.5% NaCl) to the metal–coating interface for at least 48 h of immersion, with a more prolonged barrier performance for 3 V-deposited coatings. Additional electrochemical impedance spectroscopy studies showed that all four coatings provided increased levels of charge transfer resistance (Rct)—compared to bare HDG steel—although coatings deposited at a higher potential (3 V) and a higher TOCN concentration provided the maximum charge transfer resistance after 15 days of immersion (13.7 cf. 0.2 kΩ·cm2 for HDG steel). Overall, these results highlight the potential of TOCN–CLP biopolymeric composites as a basis for sustainable corrosion protection coatings. Journal Article ACS Applied Materials & Interfaces 13 34 41034 41045 American Chemical Society (ACS) 1944-8244 1944-8252 water-borne, electrophoretic deposition, galvanized steel, scanning vibrating electrode technique,electrochemical impedance spectroscopy 1 9 2021 2021-09-01 10.1021/acsami.1c08274 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2021-10-22T16:46:12.3396325 2021-09-27T10:05:13.2049136 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Arman Dastpak 1 Philip Ansell 2 Justin Searle 0000-0003-1101-075X 3 Mari Lundström 4 Benjamin P. Wilson 5 58100__21006__cb1002a3f29c4e1192a3f8e557517028.pdf 58100.pdf 2021-09-27T10:08:24.6224065 Output 10290081 application/pdf Version of Record true © 2021 The Authors. Released under the terms of a Creative Commons Attribution license true eng https://creativecommons.org/licenses/by/4.0/
title Biopolymeric Anticorrosion Coatings from Cellulose Nanofibrils and Colloidal Lignin Particles
spellingShingle Biopolymeric Anticorrosion Coatings from Cellulose Nanofibrils and Colloidal Lignin Particles
Philip Ansell
Justin Searle
title_short Biopolymeric Anticorrosion Coatings from Cellulose Nanofibrils and Colloidal Lignin Particles
title_full Biopolymeric Anticorrosion Coatings from Cellulose Nanofibrils and Colloidal Lignin Particles
title_fullStr Biopolymeric Anticorrosion Coatings from Cellulose Nanofibrils and Colloidal Lignin Particles
title_full_unstemmed Biopolymeric Anticorrosion Coatings from Cellulose Nanofibrils and Colloidal Lignin Particles
title_sort Biopolymeric Anticorrosion Coatings from Cellulose Nanofibrils and Colloidal Lignin Particles
author_id_str_mv 8889433e9478f045d656ce784a9d79ed
0e3f2c3812f181eaed11c45554d4cdd0
author_id_fullname_str_mv 8889433e9478f045d656ce784a9d79ed_***_Philip Ansell
0e3f2c3812f181eaed11c45554d4cdd0_***_Justin Searle
author Philip Ansell
Justin Searle
author2 Arman Dastpak
Philip Ansell
Justin Searle
Mari Lundström
Benjamin P. Wilson
format Journal article
container_title ACS Applied Materials & Interfaces
container_volume 13
container_issue 34
container_start_page 41034
publishDate 2021
institution Swansea University
issn 1944-8244
1944-8252
doi_str_mv 10.1021/acsami.1c08274
publisher American Chemical Society (ACS)
college_str Faculty of Science and Engineering
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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
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description This study presents a process for preparation of cellulose–lignin barrier coatings for hot-dip galvanized (HDG) steel by aqueous electrophoretic deposition. Initially, a solution of softwood kraft lignin and diethylene glycol monobutyl ether was used to prepare an aqueous dispersion of colloidal lignin particles (CLPs) via solvent exchange. Analysis of the dispersion showed that it comprised submicron particles (D = 146 nm) with spherical morphologies and colloidal stability (ζ-potential = −40 mV). Following successful formation, the CLP dispersion was mixed with a suspension of TEMPO-oxidized cellulose nanofibers (TOCN, 1 and 2 g·L–1) at a fixed volumetric ratio (1:1, TOCN–CLPs), and biopolymers were deposited onto HDG steel surfaces at different potentials (0.5 and 3 V). The effects of these variables on coating formation, dry adhesion, and electrochemical properties (3.5% NaCl) were investigated. The scanning electron microscopy results showed that coalescence of CLPs occurs during the drying of composite coatings, resulting in formation of a barrier layer on HDG steel. The scanning vibrating electrode technique results demonstrated that the TOCN–CLP layers reduced the penetration of the electrolyte (3.5% NaCl) to the metal–coating interface for at least 48 h of immersion, with a more prolonged barrier performance for 3 V-deposited coatings. Additional electrochemical impedance spectroscopy studies showed that all four coatings provided increased levels of charge transfer resistance (Rct)—compared to bare HDG steel—although coatings deposited at a higher potential (3 V) and a higher TOCN concentration provided the maximum charge transfer resistance after 15 days of immersion (13.7 cf. 0.2 kΩ·cm2 for HDG steel). Overall, these results highlight the potential of TOCN–CLP biopolymeric composites as a basis for sustainable corrosion protection coatings.
published_date 2021-09-01T04:14:21Z
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score 11.012678

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