A strong enhancement of corrosion and wear resistance of polyurethane-based coating by chemically grafting of organosolv lignin

Di Wang, Jun Zhao, Per Claesson, Paul Christakopoulos, Ulrika Rova, Leonidas Matsakas, Erik Ytreberg, Lena Granhag, Fan Zhang*, Jinshan Pan*, Yijun Shi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Corrosion and wear pose significant challenges to equipment operating in harsh environments. Thus, protective coatings are needed. Anti-corrosion and anti-wear coatings are traditionally fossil-based and often contain environmentally harmful additives. Achieving anti-corrosion and anti-wear coatings based on environmentally benign and sustainable materials is important and a significant challenge. This work focused on the development of organosolv lignin-based polyurethane (OS_lignin-PU) coatings. The coatings were synthesised and evaluated for corrosion protection using electrochemical impedance spectroscopy (EIS) and for wear properties using nanoindentation and nano scratch measurements. EIS revealed that the optimal lignin content for corrosion protection purposes in the OS_lignin-PU coatings was 15 wt%. Moreover, addition of 15 wt% lignin to the OS_lignin-PU coatings also enhanced their wear resistance, as evidenced by reduced thickness loss during tribometer tests. The nano scratch measurements revealed that OS_lignin-PU coatings containing 15 wt% lignin exhibited the lowest scratch depth and friction coefficient. It is found that the developed lignin-containing coating exhibits remarkable corrosion and wear resistance, making it a promising sustainable material in various applications for pursuing sustainable development.

Original languageEnglish
Article number101833
JournalMaterials Today Chemistry
Volume35
DOIs
Publication statusPublished - Jan 2024
Externally publishedYes

Keywords

  • Anti-corrosion
  • Coating
  • Organosolv lignin
  • Polyurethane
  • Wear resistance

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