Bispyranopyrazoles as Green Corrosion Inhibitors for Mild Steel in Hydrochloric Acid: Experimental and Theoretical Approach

Priyanka Singh; Madhan Kumar; Mumtaz Ahmad Quraishi; Jiyaul Haque; Gurmeet Singh

doi:10.1021/acsomega.8b01300

Bispyranopyrazoles as Green Corrosion Inhibitors for Mild Steel in Hydrochloric Acid: Experimental and Theoretical Approach

ACS Omega. 2018 Sep 14;3(9):11151-11162. doi: 10.1021/acsomega.8b01300. eCollection 2018 Sep 30.

Authors

Priyanka Singh¹, Madhan Kumar², Mumtaz Ahmad Quraishi², Jiyaul Haque³, Gurmeet Singh¹

Affiliations

¹ Department of Chemistry, University of Delhi, Delhi 110007, India.
² Center of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
³ Department of Chemistry, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India.

Abstract

In the present study, we have synthesized two novel corrosion inhibitors BP-1 and BP-2 and evaluated their corrosion inhibition property on mild steel (MS) in acid solution through weight loss and electrochemical corrosion techniques. The corrosion test results reveal that both compounds inhibit corrosion by an adsorption mechanism and display inhibition efficiency more than 95% at a low concentration of 1.72 × 10^-4 M. From the surface analysis of the protective film on MS, it was corroborated that adsorption of inhibitor molecules occurred on the MS surface through chemisorption, which further suppresses the corrosion rate. Density functional theory simulated data helps correlate the experimental trend with the theoretical study.