Self-Protecting Epoxy Coatings with Anticorrosion Microcapsules

Michael Odarczenko, Dhawal Thakare, Wenle Li, Ke Yang, Shijia Tang, Sai P. Venkateswaran, Nancy R. Sottos, Scott R. White

Research output: Contribution to journalArticlepeer-review


The corrosion of steel substrates causes damage that is costly to repair or replace. Current protective coatings predominately rely on environmentally harmful anticorrosive agents and toxic solvents to protect the underlying substrate. The use of lawsone (2-hydroxy-1,4-napthoquinone) together with a water-based epoxy coating provides an environmentally friendly alternative for common protective coatings. Microencapsulated lawsone embedded in an epoxy coating allows the anticorrosive agent to remain dormant until released by damage and delivered directly onto the steel substrate. UV-vis analysis confirms successful encapsulation of lawsone in a polyurethane shell wall and reveals up to 8 wt % lawsone in the capsule cores. Uniform dry film thickness and inflicted damaged are verified with ultrasound and optical microscopy. Visual and electrochemical analysis demonstrates that this self-protective scheme leads to a 70% corrosion inhibition efficiency in a neutral salt water solution.

Original languageEnglish (US)
Pages (from-to)14157-14164
Number of pages8
JournalACS Omega
Issue number10
StatePublished - Oct 25 2018

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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