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Journal of Coatings Technology and Research

, Volume 16, Issue 1, pp 71–80 | Cite as

The polyaniline-modified TiO2 composites in water-based epoxy coating for corrosion protection of Q235 steel

  • Xuehui LiuEmail author
  • Peimin Hou
  • Xia Zhao
  • Xiumin Ma
  • Baorong HouEmail author
Article
  • 77 Downloads

Abstract

The development of active systems to protect metal substrates against corrosion is a promising approach for many industrial applications. In this work, a self-healing coating based on TiO2 particles modified with polyaniline (PANI) was prepared for corrosion protection of Q235 steel. TiO2/PANI particles were synthesized by in situ polymerization and dispersed into a water-based epoxy coating. The structure and morphology of as-prepared TiO2/PANI particles were characterized by FTIR, XRD, and SEM. The anticorrosion performance of the coating was studied by electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM). EIS analysis showed improved corrosion protection properties in the presence of TiO2/PNAI particles. SECM measurements were performed to monitor the reduction of oxygen process as a function of exposure time in 3.5% NaCl solution. SECM results showed that the epoxy coating with TiO2/PANI particles had a superior corrosion protection relative to the blank coating after artificial defect exposure to the corrosive environment.

Keywords

TiO2 Polyaniline Electrochemical impedance spectroscopy Scanning electrochemical microscopy Corrosion protection 

Notes

Acknowledgments

The authors are thankful for the funding from the Consulting Project of Research on Corrosion Control Technology and Industry Development Strategy in China (2017-XZ-16).

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Copyright information

© American Coatings Association 2018

Authors and Affiliations

  1. 1.Institute of Marine Science and TechnologyShandong UniversityJinanChina
  2. 2.Open Studio for Marine Corrosion and ProtectionQingdao National Laboratory for Marine Science and TechnologyQingdaoChina
  3. 3.Marine Chemical Research InstituteQingdaoChina
  4. 4.National Engineering Center of Marine Corrosion Protection, Institute of OceanologyChinese Academy of SciencesQingdaoChina

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