Promising Antioxidant and Anticorrosion Activities of Mild Steel in 1.0 M Hydrochloric Acid Solution by Withania frutescens L. Essential Oil.

Abdelfattah El Moussaoui,Mariya Kadiri,Amina Bari,Mouhcine Sfaira,Ahmad Mohammad Salamatullah,Mohammed Bourhia,Mohamed Chedadi,Nawal A Albadr,Heba Khalil Alyahya,Abdelkrim Agour,Abdulhakeem Alzahrani

doi:10.3389/fchem.2021.739273

Abstract

The present study was conducted to evaluate the anticorrosive and antioxidant activities of essential oil from Withania frutescens L. In the present study, the extraction of Withania frutescens L. essential oil (Wf-EO) was conducted using hydrodistillation before being characterized by gas chromatographic analysis (GC/MS) and flame ionization detector (GC/FID). Four bioassays were used for antioxidant testing including 2,2-diphenyl-1-picrylhydrazyl (DPPH), total antioxidant capacity (TAC), ferric reducing antioxidant power (FRAP), and β-carotene bleaching. The inhibiting effect of Wf-EO on the corrosion behavior of mild steel in 1.0 M HCl was conducted by using polarization curves and electrochemical impedance spectroscopy techniques. The yield of Wf-EO was 0.46% including 175 compounds identified by GC-MS. The oil was mostly constituted of camphor (37.86%), followed by thujone (26.47%), carvacrol (6.84%), eucalyptol (3.18%), and linalool (2.20%). The anti–free radical activity of Wf-EO was 34.41 ± 0.91 μg/ml (DPPH), 9.67 ± 0.15 mg/ml (FRAP), 3.78 ± 0.41 mg AAE/g (TAC), and 89.94 ± 1.44% (β-carotene). The Wf-EO showed potent antioxidant activity in all bioassays used for testing. The anticorrosion activity, polarization curves as well as EIS diagrams indicated that the Wf-EO exhibited anticorrosive properties and reacted as a suitable corrosion inhibitor in an acidic medium.

Highlights

Corrosion is a natural process that involves interactions between a material and its environment leading to changes in the properties and characteristics of the metal resulting in alteration of the material (DIN EN ISO 8044, 2020)
The obtained results showed that the extraction yield of essential oil recovered from Withania frutescens L was 0.46% with 175 compounds
Camphor found in Lavandula officinalis and Cinnamomum camphora had antioxidant and anti-inflammatory activities (Lee et al, 2006; Barkat and Imène, 2012)

Summary

INTRODUCTION

Corrosion is a natural process that involves interactions between a material and its environment leading to changes in the properties and characteristics of the metal resulting in alteration of the material (DIN EN ISO 8044, 2020). HCl causes the degradation of metals through electrochemical and/or chemical reactions. To solve such corrosion problems, there are some methods to protect metals from corrosion from acidic environments including cathodic protection, use of protective barriers, use of anti-rust solutions or corrosion inhibitors, and galvanization. It is fitting that the interest in natural anticorrosive agents has grown worldwide In this sense, Wf-EO can be one of the preferable agents that find application in the industrial sector to fight against corrosion (Lahhit et al, 2011; Gualdrón et al, 2013). To the best of our knowledge, no works have reported the anticorrosive activity of Withania frutescens L. essential oil (WfEO) up to date. The anticorrosion activity was undertaken using potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS) methods

MATERIAL AND METHOD

RESULTS AND DISCUSSION

DATA AVAILABILITY STATEMENT