Experimental and computational approach on the development of a new Green corrosion inhibitor formulation for N80 steel in 20% formic acid

K R Ansari; Dheeraj Singh Chauhan; A A Sorour; M A Quraishi; A Y Adesina; Ambrish Singh

doi:10.1016/j.jcis.2023.08.190

Experimental and computational approach on the development of a new Green corrosion inhibitor formulation for N80 steel in 20% formic acid

J Colloid Interface Sci. 2023 Dec 15;652(Pt B):2085-2097. doi: 10.1016/j.jcis.2023.08.190. Epub 2023 Aug 31.

Authors

K R Ansari¹, Dheeraj Singh Chauhan², A A Sorour³, M A Quraishi⁴, A Y Adesina³, Ambrish Singh⁵

Affiliations

¹ State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, Sichuan 610500, China.
² Center of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
³ Interdisciplinary Research Center for Advanced Materials, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
⁴ Interdisciplinary Research Center for Advanced Materials, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia. Electronic address: mumtaz.quraishi@kfupm.edu.sa.
⁵ Department of Chemistry, Nagaland University, Lumami, Headquarters, Zunheboto 798627, Nagaland, India.

PMID: 37696062
DOI: 10.1016/j.jcis.2023.08.190

Abstract

Organic acids are employed as scale dissolvers in the oil & gas industry during production to stimulate oil recovery by pumping in the formations. Corrosion of metallic surfaces in organic acid solutions poses a significant issue in the oil and gas sector. In recent years, considering the stringent environmental regulations, there has been a growing research interest in environmentally safe inhibitors. This paper explores the synthesis of 2-(3-(carboxymethyl)-1H-imidazol-3-ium-1-yl) acetate (IZ) and its first-time application for corrosion mitigation of N80 steel in 20% formic acid. A detailed experimental study involving gravimetric, electrochemical, and surface analytical techniques is reported herein. The electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) analyses suggest a rise of impedance with IZ and a mixed-type inhibition behavior, respectively. The inhibition efficiency (IE) is 99.54% at 200 mg/L at 308 K, reaching 99.4% at 363 K with the introduction of KI as a synergistic agent. Computational studies revealed that the inhibitor IZ gets protonated in the experimental environment. The protonated form shows a tendency to receive electrons from the metal surface and shows a greater energy of adsorption compared to that of the neutral form.

Keywords: Green corrosion inhibitor; Imidazole; Oil and gas; Organic acid; Scale removal.