Cerium Dioxide Nanoparticles as Smart Carriers for Self-Healing Coatings
by
Sehrish Habib 1, Eman Fayyad 1,†, Muddasir Nawaz 1, Adnan Khan 1, Rana A. Shakoor 1,*
, Ramazan Kahraman 2 and Aboubakr Abdullah 1
Sehrish Habib 1, Eman Fayyad 1,†, Muddasir Nawaz 1, Adnan Khan 1, Rana A. Shakoor 1,*, Ramazan Kahraman 2 and Aboubakr Abdullah 1
1
Center for Advanced Materials (CAM), Qatar University, Doha 2713, Qatar
2
Department of Chemical Engineering, Qatar University, Doha 2713, Qatar
*
Author to whom correspondence should be addressed.
†
Permanent address: Physical Chemistry Department, National Research Centre, Dokki, Giza P.O. Box 12622, Egypt.
Nanomaterials 2020, 10(4), 791; https://doi.org/10.3390/nano10040791
Received: 9 March 2020 / Revised: 3 April 2020 / Accepted: 5 April 2020 / Published: 20 April 2020
(This article belongs to the Special Issue Functional Inorganic Nanomaterials)
The utilization of self-healing cerium dioxide nanoparticles (CeO2), modified with organic corrosion inhibitors (dodecylamine (DDA) and n-methylthiourea (NMTU)), in epoxy coating is an efficient strategy for enhancing the protection of the epoxy coating and increasing its lifetime. Fourier transform infrared (FTIR) spectroscopy analysis was used to confirm the loading and presence of inhibitors in the nanoparticles. Thermal gravimetric analysis (TGA) measurement studies revealed the amount of 25% and 29.75% w/w for NMTU and DDA in the nanoparticles, respectively. The pH sensitive and self-release behavior of modified CeO2 nanoparticles is confirmed through UV-vis spectroscopy and Zeta potential. It was observed, through scanning electron microscopy (SEM), that a protective layer had been formed on the defect site separating the steel surface from the external environment and healed the artificially created scratch. This protective film played a vital role in the corrosion inhibition of steel by preventing the aggressiveness of Cl− in the solution. Electrochemical impedance spectroscopy (EIS) measurements exhibited the exceptional corrosion inhibition efficiency, reaching 99.8% and 95.7% for the modified coating with DDA and NMTU, respectively, after five days of immersion time.
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Keywords:
nanocomposite coating; self-healing; corrosion inhibitor; electrochemical impedance spectroscopy; nanoparticles
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MDPI and ACS Style
Habib, S.; Fayyad, E.; Nawaz, M.; Khan, A.; Shakoor, R.A.; Kahraman, R.; Abdullah, A. Cerium Dioxide Nanoparticles as Smart Carriers for Self-Healing Coatings. Nanomaterials 2020, 10, 791.
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