Anticorrosive Effects of Essential Oils Obtained from White Wormwood and Arâr Plants

Abstract

This article is part of the contribution to the development of two medicinal plants widely used by the Moroccan population: white wormwood (Artemisia herba-alba) andArâr (Juniperus phoenicea), species belonging to the Asteraceae and Cupressaceae families, respectively. The present work was conducted to investigate the chemical composition and anticorrosive properties of essential oils (EOs) extracted from these plants. The chemical analysis of the essential oils (EOs) was carried out by GC-MS/MS. Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and quantum chemical calculations by density-functional theory at B3lYP were used to study the anticorrosive effect of the researched oils on mild steel in 1 M hydrochloric acid solution. Moreover, SEM-EDX analysis was used to identify the surface morphology of mild steel surface. GC-MSMS results showed the presence of 32 potentially active compounds in the EOs of Artemisia herba-alba. The average yield of the EOs was about 1.39 ± 0.17 mL/100 g dry matter. Beta thujone (30.07%) and alpha thujone (13.32%) are the main components, while for the EOs of Juniperus phoenicea, the study showed the presence of 30 constituents, with alpha-pinene (43.61%) and manoyl oxide (11.5%) as the main components. The average yield of HE was 1.10 ± 0.03 mL/100 g dry matter. The findings demonstrated an important anticorrosive action of EOs from Artemisia herba-alba and Juniperus phoenicea. Notably, the experimental results showed good efficiency of the studied essential oils and correlated well with the density-functional theory (DFT) calculations. The results of potentiodynamic polarization measurements showed that hydrazone acted as a mixed-type inhibitor. The EIS results showed an increase in charge transfer resistance accompanied by a noticeable decrease in Cdl values, revealing that both studied oils were effective as reliable inhibitors for the protection of mild steel in 1 M HCl solution. Also, the efficiency decreased with decreasing inhibitor concentrations. Surface studies ensure the effectiveness of both investigated oils and the reduction of the surface roughness of mild steel. Furthermore, DFT results of the major constituents of Artemisia herba-alba and Juniperus phoenicea EOs revealed insights into the chemical reactivity of the tested oils while supporting the experimental conclusions and showed outstanding adsorption ability of both investigated EOs on the steel surface.

Principles and theories of green chemistry for corrosion science and engineering: design and application

“…As a complement to experimental assessments, quantum chemistry approaches such as DFT and DFTB are now being explored to gain insights into the anticorrosive mechanism of essential oils by elucidating the electronic properties of their primary constituents. Beniaich et al 523 utilized the DFT method to study the adsorption of Artemisia herba-alba essential oils on metal surfaces, providing spatial distributions in the aqueous phase (Fig. 20).…”

Preparation and Application of Volatilized Wormwood Essence Derived Naturally into Green Insecticide

“…In addition, wormwood can treat serious gastrointestinal diseases caused by parasites such as pinworms, roundworms, and tapeworms. From a historical perspective, wormwood was once considered the preferred drug for treating intestinal worms, but due to the serious side effects associated with absinthe, it is no longer popular [ 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. In a 2017 research report, extracts of Artemisia absinthium were found to be effective in killing Hymenolepis nana in laboratory mice.…”