2-Hydroxy- N'-((Thiophene-2-yl)methylene)benzohydrazide: Ultrasound-Assisted Synthesis and Corrosion Inhibition Study

Ashish Kumar Singh; Sanjeeve Thakur; Balaram Pani; Eno E Ebenso; Mumtaz Ahmad Quraishi; Ajit Kumar Pandey

doi:10.1021/acsomega.8b00003

2-Hydroxy- N'-((Thiophene-2-yl)methylene)benzohydrazide: Ultrasound-Assisted Synthesis and Corrosion Inhibition Study

ACS Omega. 2018 Apr 30;3(4):4695-4705. doi: 10.1021/acsomega.8b00003.

Authors

Ashish Kumar Singh¹, Sanjeeve Thakur², Balaram Pani³, Eno E Ebenso⁴, Mumtaz Ahmad Quraishi⁵, Ajit Kumar Pandey²

Affiliations

¹ Department of Applied Science, Bharati Vidyapeeth's College of Engineering, New Delhi 110063, India.
² Department of Chemistry, NSIT, University of Delhi, New Delhi 110078, India.
³ Department of Chemistry, Bhaskaracharya College of Applied Science, University of Delhi, New Delhi 110075, India.
⁴ Material Science Innovation & Modelling (MaSIM) Research Focus Area, Faculty of Natural and Agricultural Sciences, North-West University, Private Bag X2046, Mmabatho 2735, South Africa.
⁵ Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, India.

Abstract

2-Hydroxy-N'-((thiophene-2-yl)methylene)benzohydrazide (HTMBH) was synthesized by conventional method as well as by ultrasonication (US). The ultrasound-assisted synthesis of HTMBH was found to have good yield and be more eco-friendly compared to the conventional method of synthesis. The synthesized compound HTMBH was characterized by Fourier transform infrared, ¹H NMR, and CHN analyses. The corrosion inhibition behavior of HTMBH was investigated using gravimetric and electrochemical methods in 0.5 M H₂SO₄. The thermodynamic adsorption parameters revealed that HTMBH was adsorbed on the mild steel surface in both ways, physically and chemically, although physisorption is predominant. The study of activation parameters revealed that it is the increase in activation energy that is a prominent factor to lower the corrosion rate in acid medium. Atomic force microscopy analysis is also carried out to investigate the effect of HTMBH on the surface of mild steel surface in acid solution. The contact angle measurement showed decreased affinity of mild steel surface for acid solution containing HTMBH. The results obtained from all of these methods showed good consistency.