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    A sustainable two-layer lignin-anodized composite coating for the corrosion protection of high-strength low-alloy steel

    Year: 2020

    Journal: Prog. Org. Coat., Volume 148, NOV

    Authors: Dastpak, Arman; Hannula, Pyry-Mikko; Lundstrom, Mari; Wilson, Benjamin P.

    Organizations: Technology Industries of Finland/Jane and Aatos Erkko Foundations; Academy of Finland "Future Makers: Biorefinery Side Stream Materials for Advanced Biopolymer Materials (BioPolyMet)"; Academy of Finland (NoWASTE)Academy of Finland [297962]; Academy of FinlandAcademy of FinlandEuropean Commission; OtaNano Infrastructure at Aalto University; Finn CERES Materials Bioeconomy Ecosystem

    Keywords: Steel; Oxide coating; Biopolymer; Organic coating; Corrosion protection

    In this study, plasticized kraft lignin was used to prepare anti-corrosive coatings on steel, which was galvanostatically anodized (80 degrees C, 25 wt.% NaOH) by utilizing three different current density values (24, 50 and 120 mA/cm(2)). It was shown that the anodization affects not only the properties of anodic coatings but also their interaction with lignin coatings. A combination of pull-off adhesion measurements with linear sweep voltammetry (LSV) demonstrated an enhanced adhesion strength of plasticized lignin coatings (4.32 MPa on anodized surface vs. 2.38 MPa on bare steel) and decreased corrosion current density from 15 mu A/cm(2) (bare steel) up to ca. 0.5 mu A/cm(2) for anodized and lignin coated steel.
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