Performance of Lignin as a Sustainable Anticorrosion Coating

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School of Chemical Technology | Doctoral thesis (article-based) | Defence date: 2022-05-13
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Authors

Date

2022

Department

Kemian tekniikan ja metallurgian laitos
Department of Chemical and Metallurgical Engineering

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Mcode

Degree programme

Language

en

Pages

74 + app. 82

Series

Aalto University publication series DOCTORAL THESES, 55/2022

Abstract

Synthetic polymers play a pivotal role in many industrial applications that includes their utilization as barrier coatings for corrosion protection of metal surfaces. However, use of such non-renewable coatings results in environmental pollution both during production and use. As such, there is a global effort to find/produce more sustainable metal coatings from renewable resources including biomass-based polymers. Consequently, this thesis investigates the performance of technical lignin—a primary waste from biomass processing industries—as an organic binder in anticorrosion coatings, with a focus on the industrial applicability of these materials and associated deposition techniques. Electrochemical properties of stainless steel spin-coated with two different organosolv lignin (dissolved in 1,4-Dioxane) were investigated. Results showed that the coatings enhanced the resistance of surfaces against corrosion with a lignin source-dependent variation of the barrier properties. In order to address the limited lignin solubility in many organic solvents, the screening of a series of industrially-applicable organic solvents was undertaken. Findings indicated that two solvents—diethylene glycol monobutyl ether (DEGBE) and propylene glycol monomethyl ether (PGME)—act as strong solvents for a kraft and an organosolv lignin, and that DEGBE also has a plasticizing effect on lignin. However, electrochemical analysis of lignin-coated steel prepared from PGME following prolonged immersion (24 hours) in 5 wt.% NaCl, showed that these coatings offer limited protection. Furthermore, cracking of lignin-PGME coatings was observed, which was found to be mitigated by addition of triethyl citrate (TEC) as a plasticizer. An alternative and more environmentally benign route for the preparation of lignin-based coatings was further achieved by the preparation of aqueous dispersions of colloidal lignin particles (CLPs) using DEGBE as the starting solvent in a solvent-exchange procedure. Consequently, it was possible to prepare combined lignin-cellulose composite coatings using electrophoretic deposition (EPD) from aqueous dispersions at low deposition potentials, and resulted in coatings with enhanced durability during long term immersion (15 days) in 3.5 wt.% NaCl electrolyte. An important outcome of this process was the coalescense of CLPs during drying—as a result of the DEGBE—that enabled the formation of compact coatings. Such techniques and coalescing characteristics could be exploited in the preparation of water-borne lignin layers with enhanced corrosion protection capabilities as part of a future fully sustainable coating formulation.

Description

Defence is held on 13.5.2022 12:00 – 15:00 https://aalto.zoom.us/j/63652927222

Supervising professor

Lundström, Mari, Asst. Prof., Aalto University, Department of Chemical and Metallurgical Engineering, Finland

Thesis advisor

Wilson, Benjamin P., Dr., Aalto University, Finland

Keywords

lignin, organic coating, steel, corrosion protection

Other note

Parts

  • [Publication 1]: Dastpak, Arman; Yliniemi, Kirsi; Monteiro, Mariana Cecilio de Oliveira; Höhn, Sarah; Virtanen, Sannakaisa; Lundström, Mari; Wilson, Benjamin, P. From Waste to Valuable Resource: Lignin as a Sustainable Anti-Corrosion Coating. Coatings, 2018, 8 (12), 454.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201902251795
    DOI: 10.3390/coatings8120454 View at publisher
  • [Publication 2]: Dastpak, Arman; Lourençon, Tainise, V.; Balakshin, Mikhail; Hashmi, Syed Farhan; Lundström, Mari; Wilson, Benjamin, P. Solubility study of lignin in industrial organic solvents and investigation of electrochemical properties of spray-coated solutions. Industrial Crops & Products, 2020, 148, 112310.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202006013535
    DOI: 10.1016/j.indcrop.2020.112310 View at publisher
  • [Publication 3]: Dastpak, Arman; Hannula, Pyry-Mikko; Lundström, Mari; Wilson, Benjamin, P. A sustainable two-layer lignin-anodized composite coating for the corrosion protection of high-strength low-alloy steel. Progress in Organic Coatings, 2020, 148, 105866.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202008064442
    DOI: 10.1016/j.porgcoat.2020.105866 View at publisher
  • [Publication 4]: Dastpak, Arman; Ansell, Philip; Searle, Justin, R; Lundström, Mari; Wilson, Benjamin, P. Biopolymeric Anticorrosion Coatings from Cellulose Nanofibrils and Colloidal Lignin Particles. Applied Materials & Interfaces, 2021, 13 (34).
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202110139582
    DOI: 10.1021/acsami.1c08274 View at publisher

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https://urn.fi/URN:ISBN:978-952-64-0773-9

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[diss] Kemian tekniikan korkeakoulu / CHEM