From Waste to Valuable Resource: Lignin as a Sustainable Anti-Corrosion Coating

Language
en
Document Type
Article
Issue Date
2019-08-15
First published
2018-12-08
Issue Year
2018
Authors
Dastpak, Arman
Yliniemi, Kirsi
De Oliveira Monteiro, Mariana Cecilio
Höhn, Sarah
Virtanen, Sannakaisa
Lundström, Mari
Wilson, Benjamin P.
Editor
Publisher
MDPI
Abstract

In this study, a waste of biorefinery—lignin—is investigated as an anticorrosion coating on stainless steel. Corrosion behavior of two lignin types (hardwood beech and softwood spruce) was studied by electrochemical measurements (linear sweep voltammetry, open circuit potential, potentiostatic polarization, cyclic potentiodynamic polarization, and electrochemical impedance measurements) during exposure to simulated body fluid (SBF) or phosphate buffer (PBS). Results from linear sweep voltammetry of lignin-coated samples, in particular, demonstrated a reduction in corrosion current density between 1 and 3 orders of magnitude cf. blank stainless steel. Furthermore, results from cross cut adhesion tests on lignin-coated samples demonstrated that the best possible adhesion (grade 0) of ISO 2409 standard was achieved for the investigated novel coatings. Such findings suggest that lignin materials could transform the field of organic coatings towards more sustainable alternatives by replacing non-renewable polymer coatings.

Journal Title
Coatings
Volume
8
Issue
12
Citation
Coatings 8.12 (2018). <https://www.mdpi.com/2079-6412/8/12/454>
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