شيبا مرداني

The purpose of this research is to improve the corrosion resistance of water-borne acrylic resin by adding bio-based additives to these resins. For this purpose, investigations were carried out in two phases: extraction of polyphenolic compounds from soft shell of pistachio and solvent-thermal synthesis of N-doped carbon dots from polyphenolic compounds extracted from soft shell of pistachio. In each of these phases, the anticorrosive properties of these compounds were studied independently in the solution phase and dispersed in water-based acrylic resin and in 1 M hydrochloric acid medium. Particles were identified by Fourier transform infrared spectrometry, liquid chromatography with mass spectrometer and field emission scanning electron microscope, dynamic light scattering and ultraviolet-visible spectroscopy. The results agreed with each other and confirmed the correct synthesis and achievement of the predicted nitrogen doped carbon dot structures. In the next part, the inhibitory performance of pistachio soft shell plant extract and N-doped carbon dots from pistachio soft shell in solution state were eva‎luated using electrochemical impedance spectroscopy and polarization tests. Also, these compounds were added to water-borne acrylic resin and the anti-corrosion properties of resins containing these materials were eva‎luated using electrochemical impedance spectroscopy, salt fog and FE-SEM/EDS tests. In the polarization test, both materials, i.e. pistachio soft shell plant extract and nitrogen-doped carbon dots from pistachio soft shell, increased the efficiency by 65% and 94%, respectively, at 800ppm concentration by increasing the concentration in 1 M hydrochloric acid solution. It was more than other samples. Addition of pistachio soft shell plant extract to acrylic resin due to the instability of the compounds and lack of uniform distribution in the resin caused many holes in the coating after exposure to the corrosive environment, which led to relatively higher water absorption compared to the pure acrylic coating. However, the addition of N-doped carbon dots from soft pistachio shell significantly improved the corrosion capability of the coating on the substrate, and after 4 weeks of exposure to acidic solution, the total impedance value at frequency 0.01 for the non-scratch coating containing The amount of 0.3% of solid weight of N-doped carbon dots from pistachio soft shell was equal to 211960 kΩ.cm2 Also, the results of FE-SEM/EDS tests showed the formation of a compact and uniform inhibitory layer after 6 hours on the surface of carbon steel immersed in 1 M hydrochloric acid solution containing 800 ppm of N-doped carbon dots from pistachio soft shell. According to these results, carbon dots doped with nitrogen from pistachio soft shell showed the best corrosion inhibition performance compared to samples without inhibitor and samples containing plant extract from pistachio soft shell.

فولاد كربني , رزين اكريليك آب‌پايه , بازدارنده زيست‌پايه , عصاره پوسته نرم پسته , نقاط كربني دوپ شده با نيتروژن

carbon steel , water-bone acrylic resin , bio-based inhibitor , pistachio soft-shell extract , N-doped carbon dots

Shiba Mardani

Dr. Mohammad Reza Moghbeli - Dr. Zahra Ranjbar