Author:
Dastpak Arman,Yliniemi Kirsi,de Oliveira Monteiro Mariana,Höhn Sarah,Virtanen Sannakaisa,Lundström Mari,Wilson Benjamin.
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.
Funder
Jane ja Aatos Erkon Säätiö
Academy of Finland
Subject
Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces
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