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Enhanced active/barrier corrosion protective properties of epoxy coatings containing eco-friendly green inorganic/organic hybrid pigments based on zinc cations/Ferula Asafoetida leaves

2020; Elsevier BV; Volume: 323; Linguagem: Inglês

10.1016/j.molliq.2020.114584

1873-3166

Seyyed Arash Haddadi, Saeed Ghaderi, Mohsen Sadeghi, Behzad Gorji, Farhad Ahmadijokani, Ahmad Ramazani, Mohammad Mahdavian, Mohammad Arjmand,

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In this study, a novel inorganic/organic hybrid pigment based on zinc cations/Ferula Asafoetida leaves extract (Zn-FALE) was synthesized, and its corrosion protection properties were investigated in a saline solution and an organic coating. Interactions of components between Zn2+ cations and FALE were assessed by thermo-gravimetric analysis (TGA) and ultraviolet-visible (UV–visible) spectroscopy. Corrosion inhibitive performance of FALE and Zn-FALE pigments in the solution phase and coating phase was studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). TGA and UV–visible results revealed the proper chelation between inorganic and organic components of Zn-FALE hybrid green pigments. Electrochemical measurement results showed that the addition of 200 mg L−1 FALE and Zn-FALE in the saline solution increased the total impedance of mild steel plates from ~672 to ~8154 and 12,786 Ω cm2, respectively, after 24 h immersion. Also, FALE and Zn-FALE showed a mixed-type inhibition mechanism with an efficiency of 67 and 90.2%, respectively. Moreover, EIS results in the coating phase showed that in the presence of 3 wt% of Zn-FALE pigments, the barrier and active corrosion protection performance of epoxy coatings enhanced significantly. The results showed that Zn-FALE pigments have a better performance compared to other extracts reported in the literature.