The Effect of Using Conocarpus Extract as a Green Inhibitor on Steel Corrosion in Hydrochloric Acid Environment in Oil Well Acidizing

Rashed, Gholamreza; Salehi, Maryam; Shishesaz, Mohammadreza; Danaee, Iman

doi:10.22050/ijogst.2022.326955.1622

The Effect of Using Conocarpus Extract as a Green Inhibitor on Steel Corrosion in Hydrochloric Acid Environment in Oil Well Acidizing

Document Type : Research Paper

Authors

Gholamreza Rashed ¹

Maryam Salehi ²

Mohammadreza Shishesaz ³

Iman Danaee ⁴

¹ Associate Professor, Department of Mechanical Engineering, Petroleum University of Technology, Abadan, Iran

² MS Student, Department of Technical Inspection Engineering, Petroleum University of Technology, Abadan, Iran

³ Associate Professor, Department of Inspection Engineering, Petroleum University of Technology, Abadan, Iran

⁴ Associate Professor, Abadan Faculty of Petroleum Engineering, petroleum university of Technology, Abadan, Iran

https://doi.org/10.22050/ijogst.2022.326955.1622

Abstract

The effect of using Conocarpus extract as a green inhibitor on the corrosion behavior of mild steel in a 1 M HCL environment is investigated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FTIR). The impedance tests show that the polarization resistance increases from 29 for the blank solution to 299 for the solution containing 2500 ppm of Conocarpus extract. The polarization test results show that at room temperature, the corrosion current density for the blank solution decreases from 3.5 × 10^–4 to 2.6× 10^–5 for the solution containing 2500 ppm of Conocarpus extract, and the potential is shifted to negative values. The polarization test is performed at three temperatures of 25, 55, and 85 °C. The results show that the efficiency of 1925 ppm decreases from 93% at room temperature to 86% at 85 °C. The high-temperature efficiency does not decline significantly, indicating the effectiveness of Conocarpus extract at high temperatures. The FTIR tests also prove that the corrosion inhibitory effect of Conocarpus extract is due to the presence of heteroatoms such as N, S, and O. The adsorption isotherm results show that the adsorption of the extract as a single layer on the surface is consistent with the Langmuir isotherm.

Highlights

The effect of Conocarpus extract on the corrosion of mild steel in 1 M HCl medium was investigated;
Corrosion parameters, including corrosion current density, polarization resistance, and surface coverage, were obtained by electrochemical impedance and potentiodynamic polarization methods;
The effect of temperature on the corrosion behavior of mild steel in a solution containing Conocarpus extract was investigated. Conocarpus extract was able to maintain its inhibitory properties at high temperatures;
The inhibitory properties of Conocarpus extract were due to the presence of heteroatoms of N, S, and O and their adsorption on the surface.

Keywords

Electrochemical impedance

Fourier transform infrared spectroscopy

green inhibitor

Langmuir

Polarization

Subjects

Technical Inspection Engineering

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