https://doi.org/10.1007/s40090-018-0152-5

Phosphorous-based epoxy resin composition as an effective anticorrosive coating for steel

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  • O. Dagdag1,
  • A. El Harfi1,
  • A. Essamri1,
  • M. El Gouri2,
  • S. Chraibi2,
  • M. Assouag3,
  • B. Benzidia4,
  • O. Hamed5,
  • H. Lgaz4,
  • S. Jodeh*4,
  1. Laboratory of Agroresources, Polymers and Process Engineering, Team of Macromolecular and Organic Chemistry, Department of Chemistry, Faculty of Science, Ibn Tofail University, BP 133, 14000, Kenitra, Morocco
  2. Team of Materials, Metallurgy and Process Engineering, ENSAM, University Moulay Ismail, B.P. 15290, Al Mansour, Meknes, Morocco
  3. Laboratory of Materials, Electrochemistry and Environment, Department of Chemistry, Faculty of Sciences, Ibn Tofail University, Kenitra, Morocco
  4. Department of Chemistry, An-Najah National University, P. O. Box 7, Nablus, Palestine
  5. Department of Applied Bioscience, College of Life and Environment Science, Konkuk University, 120 11 Neungdong-ro, Gwangjin-gu, Seoul, 05029, South Korea

Published in Issue 2023-11-17

How to Cite

Dagdag, O., Harfi, A. E., Essamri, A., Gouri, M. E., Chraibi, S., Assouag, M., Benzidia, B., Hamed, O., Lgaz, H., & Jodeh, S. (2023). Phosphorous-based epoxy resin composition as an effective anticorrosive coating for steel. International Journal of Industrial Chemistry, 9(3). https://doi.org/https://doi.org/10.1007/s40090-018-0152-5
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Abstract

Epoxy resin (ER) is an attractive material for metal protection against corrosion; it can form a strongly adhered film onto a metal surface through its multi coordination sites. In this study, an epoxy resin-based formulation was designed, prepared, and applied onto steel surface with and without a pigment. The anticorrosive formulation (ERâMDAâZP) was prepared from the ER and the hardener 4,4â²-methylene dianiline (MDA) in the presence of the anticorrosive pigment zinc phosphate (ZP). A second standard formulation (ERâMDA) was prepared without ZP. The epoxy and the hardener react to form a 3D cross-linked polymeric network with multicoordination sites (hydroxyl and amino groups) for metals. The characterization of the epoxy resin was performed using Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (1H and 31P NMR). Both samples exhibited excellent thermal properties as they subjected to thermal analysis using differential scanning calorimetry. The ERâMDAâZP formulation showed a higher glass transition temperature (Tg) than ERâMDA. The coated steel specimens were immersed for 1 h in a 3 wt% NaCl solution and their anticorrosive properties were monitored by electrochemical impedance spectroscopy (EIS). The total resistance (Rt) values obtained by the EIS method for the ERâMDA and ERâMDAâZP formulations were 21,383 Ω cm2 and 55,143 Ω cm2, respectively. The coated steel samples after the acid treatment were subjected to aging by exposing them to a UV light for 2000 h. The aging caused the Rt values to drop to 1621 Ω cm2 and 7264 Î© cm2, respectively. The results indicate the formation of a highly stable film of ERâMDAâZP formulation on the steel surface that withstands an accelerated corrosive environment of 2000 h exposure to UV light and 1 h of immersion in a 3 wt% NaCl.

Keywords

  • 3 wt% NaCl,
  • Carbon steel,
  • Electrochemical Impedance Spectroscopy,
  • Epoxy coatings,
  • Ultraviolet radiation,
  • Zinc phosphate
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