화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.83, 153-163, March, 2020
DOI10.1016/j.jiec.2019.11.023  Export Citation
Nanodiamond loaded with corrosion inhibitor as efficient nanocarrier to improve anticorrosion behavior of epoxy coating
Pooria Rahmani, Akbar Shojaei†, and Nahid Pirhady Tavandashti1
  • Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box 11155-9465, Tehran, Iran
  • 1Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
E-mail:
In the present study, thermally oxidized nanodiamond (OND) was first modified non-covalently with dodecylamine (DDA) as corrosion inhibitor. In this respect, reactive primary amine of DDA molecule with high isoelectric point (IEP) could interact easily with negative charge carboxylic acid groups of OND. Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) proved that OND nanoparticle was successfully functionalized by DDA up to approximately 5 wt% grafting contnet. Both OND and dodecylamine modified OND (DND) were loaded in epoxy (EP)/polyamine hardener matrix at the same concentration of 1 wt% and applied on mild steel substrate. Morphology of EP-DND and EP-OND investigated by field emission-scanning electron microscopy (FE-SEM) suggested well nano dispersion of DND in EP matrix. A detailed electrochemical impedance spectroscopy (EIS) analysis showed that low frequency impedance of EP-DND after 30 days immersion in 3.5 wt% NaCl solution is at least one order of magnitude higher than EP-OND and pure epoxy. Such superior corrosion protection behavior was associated to effective barrier properties of EP-DND against corrosive species caused by well dispersion of DND and efficient interaction within epoxy matrix as well as pH responsive release of DDA as corrosion inhibitor from nanodiamond surface.
Keywords:Nanodiamond;Surface modification;Dodecylamine;Epoxy coating;Corrosion
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