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Nanodiamond loaded with corrosion inhibitor as efficient nanocarrier to improve anticorrosion behavior of epoxy coating

Rahmani, P ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jiec.2019.11.023
  3. Publisher: Korean Society of Industrial Engineering Chemistry , 2020
  4. Abstract:
  5. 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. © 2019 The Korean Society of Industrial and Engineering Chemistry
  6. Keywords:
  7. Dodecylamine ; Epoxy coating ; Nanodiamond ; Surface modification ; Amines ; Corrosion ; Corrosion inhibitors ; Dispersions ; Electrochemical corrosion ; Electrochemical impedance spectroscopy ; Enamels ; Epoxy resins ; Field emission microscopes ; Fourier transform infrared spectroscopy ; Morphology ; Nanodiamonds ; Scanning electron microscopy ; Sodium chloride ; Surface treatment ; Thermogravimetric analysis ; 3.5 wt% NaCl solution ; Carboxylic acid groups ; Dodecyl amines ; Efficient interaction ; Epoxy coatings ; Field emission scanning electron microscopy ; Low-frequency impedance ; Mild steel substrates ; Corrosion resistant coatings
  8. Source: Journal of Industrial and Engineering Chemistry ; Volume 83 , 2020 , Pages 153-163
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1226086X19306161