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

Arman Dastpak, Pyry Mikko Hannula, Mari Lundström, Benjamin P. Wilson*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
30 Downloads (Pure)

Abstract

In this study, plasticized kraft lignin was used to prepare anti-corrosive coatings on steel, which was galvanostatically anodized (80 °C, 25 wt.% NaOH) by utilizing three different current density values (24, 50 and 120 mA/cm2). 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 μA/cm2 (bare steel) up to ca. 0.5 μA/cm2 for anodized and lignin coated steel.

Original languageEnglish
Article number105866
Number of pages9
JournalPROGRESS IN ORGANIC COATINGS
Volume148
DOIs
Publication statusPublished - Nov 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Biopolymer
  • Corrosion protection
  • Organic coating
  • Oxide coating
  • Steel

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