Singha, Ashish K and Pandey, Ajit K and Banerjee, Priyabrata and Saha, Sourav Kr and Chugh, Bhawna and Thakur, Sanjeeve and Pani, Balaram and Chaubey, Pramila and Singh, Gurmeet (2019) Eco-friendly disposal of expired anti-tuberculosis drug isoniazid and its role in the protection of metal. Journal of Environmental Chemical Engineering, 7 (2 ).

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The severity of the problem of corrosion led Corrosion Scientists to do extensive work to find out a solution which can minimize the damage caused by corrosion. In this context corrosion inhibitors, has been offered a very promising solution for acidic corrosion. In view of it, some Schiff bases of Isoniazid with 5-substitute indole derivatives were synthesized and investigated for their corrosion hampering potential. The spectral characterizations (Fourier-Transform Infra-Red, 1H Nuclear Magnetic Resonance, elemental determination, i.e. CHN) were done to ensure their synthesis. This study reported results obtained from electrochemical impedance spectroscopy (EIS), polarization measurement, and weight loss, scanning electron microscopy equipped with energy dispersive x-ray analysis (SEM-EDX), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The experimental results were excellently complemented with the results obtained from density functional theory, i.e. DFT and molecular dynamics, i.e. MD. These hydrazones inhibited corrosion by adsorbing themselves on the metal surface which was confirmed by SEM-EDX and XPS results. All the synthesized inhibitors showed appreciable efficiency (> 90%) against corrosion of mild steel in 1 M HCl medium. The activation energy increased by the presence of inhibitors (76.1, 79.8, 77.3, and 67.0 kJ mol−1 for IICH, ICCH, IBCH, and IMCH respectively) compared to that in 1 M HCl solution only (32.8 kJ mol−1). All these compounds were found to act as a mixed type of inhibitor as confirmed by shifting range of corrosion potential (30 mV, 35 mV, 18 mV, and 36 mV for IICH, ICCH, IBCH, and IMCH respectively).

Item Type: Article
Subjects: Creep corrosion
Depositing User: Dr. Arup Kr. Nandi
Date Deposited: 15 Jan 2021 07:25
Last Modified: 15 Jan 2021 07:25

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