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Biomimetic Materials to Characterize Bacteria-host Interactions
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Thin Nacre-Biomimetic Coating with Super-Anticorrosion Performance.

Yan Zhang1,2, Jingwei Tian2, Jing Zhong2

  • 1Laboratory of Corrosion Science & Electrochemical Engineering, Civil and Environmental Engineering , Washington State University , Pullman , Washington 99164 , United States.

ACS Nano
|September 7, 2018
PubMed
Summary

Nacre-biomimetic graphene oxide/epoxy (GO/epoxy) coatings offer superior corrosion protection for steel. These layered materials significantly reduce corrosion rates compared to traditional epoxy coatings, showcasing their potential in demanding environments.

Keywords:
biomimeticchloride diffusionepoxygraphene oxide

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Area of Science:

  • Materials Science
  • Corrosion Science
  • Biomimetics

Background:

  • Nacre's natural layered structure provides exceptional resistance to mechanical and chemical damage.
  • Nacre-biomimetic materials offer a promising route to achieve high strength and toughness.
  • The anticorrosion potential of nacre-like structures remains underexplored.

Purpose of the Study:

  • To investigate the anticorrosion performance of nacre-biomimetic graphene oxide/epoxy (GO/epoxy) coatings.
  • To compare the effectiveness of these layered coatings against pure epoxy and mixed-nanoparticle coatings.
  • To elucidate the anticorrosion mechanism of the nacre-biomimetic GO/epoxy coatings.

Main Methods:

  • Fabrication of nacre-biomimetic GO/epoxy coatings with alternating layers.
  • Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) for corrosion rate assessment.
  • Surface analysis using SEM, EDS, FTIR, XPS, and XRD; chloride diffusion tests.

Main Results:

  • The 5-layer GO/6-layer epoxy (5NBGE) coating (17 μm) reduced steel corrosion rate by 20x compared to thicker pure epoxy.
  • NBGE coatings outperformed carbon-based nanoparticle/epoxy mixed coatings.
  • Layer-by-layer structure confirmed, with GO layers effectively blocking corrosive species (O2, H2O, Cl-).

Conclusions:

  • Nacre-biomimetic GO/epoxy coatings demonstrate superior anticorrosion performance.
  • The layered structure and graphene oxide intercalation are key to enhanced protection.
  • These materials offer a viable strategy for advanced corrosion protection applications.