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

Arman Dastpak, Kirsi Yliniemi, Mariana Cecilio de Oliveira Monteiro, Sarah Höhn, Sannakaisa Virtanen, Mari Lundström, Benjamin P. Wilson

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)
203 Downloads (Pure)

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.
Original languageEnglish
Article number454
Number of pages16
JournalCoatings
Volume8
Issue number12
DOIs
Publication statusPublished - 8 Dec 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Stainless steel
  • Polymer coatings
  • Anodic/cathodic protection
  • Cyclic voltammetry
  • Infrared (IR) spectroscopy

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