Tannin-based inhibitive pigment for sustainable epoxy coatings formulation

Zoi Lamprakou, Huichao Bi*, Claus Erik Weinell, Kim Dam-Johansen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Calcium tannate was synthesized, characterized, and dispersed into an epoxy coating as an inhibitive pigment. Electrochemical Impedance Spectroscopy (EIS) was employed to monitor the anti-corrosive performance of the coating formulated with the as-prepared pigment after exposure to the salt spray chamber. Reference coatings with the commercial calcium phosphate pigment and unpigmented coating were also evaluated for comparison reasons. EIS results showed that epoxy coating pigmented with calcium tannate has higher coating impedance after 21 days of exposure compared with reference coatings, either unpigmented or calcium phosphate pigmented coatings. XPS analysis was employed for a deeper understanding of the inhibitive action of calcium tannate towards corrosion protection and verified the incorporation of tannate molecules in the protective film formed on the steel substrate under the calcium tannate pigmented coating.
Original languageEnglish
JournalProgress in Organic Coatings
Publication statusPublished - 2022


  • Corrosion
  • Tannins
  • Calcium tannate
  • Epoxy coating
  • EIS


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