article · Coatings
Plant-derived natural extracts are gaining interest as environmentally benign alternatives to conventional corrosion inhibitors for metallic structures. This research examines the corrosion protection performance of a methanolic extract of parsley on C37 carbon steel exposed to a 1 M hydrochloric acid environment. Chemical analysis identified myristicin and apiol as the primary components of the extract. Testing across concentrations from 0.1 to 1 gram per litre and temperatures from 303 to 333 Kelvin demonstrated that the extract significantly lowers the steel corrosion rate. Peak inhibition efficiency reached 92 percent at the highest concentration tested, though protection decreased at higher temperatures. The extract functions as a mixed-type inhibitor, impeding both anodic and cathodic processes by forming a protective surface film governed by physical and chemical adsorption mechanisms.
Industrial equipment made of carbon steel frequently suffers from damaging degradation when exposed to acidic environments. Traditional chemical corrosion inhibitors can be hazardous and costly, making eco-friendly alternatives highly desirable. Demonstrating that a parsley-derived extract can effectively curb metal corrosion provides a sustainable path toward reducing equipment degradation using safe, renewable plant resources.
This research could enable the development of plant-derived, eco-friendly corrosion inhibitor formulations for industries that operate acidic pickling or cleaning baths for carbon steel. Industrial operators and chemical manufacturers seeking non-toxic alternatives are the most relevant prospective users. Because testing was conducted solely at laboratory scale across simulated acid conditions, the technology remains in an early-stage research phase and requires field testing before practical deployment.
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Phytochemical-rich natural extracts have recently attracted intense attention as green corrosion inhibitors and costly benign coating components for the protection of metallic structures of immense commercial importance. Herein, various methods were applied to assess the corrosion protection efficiency of a methanolic extract of parsley (Petroselinum crispum) (PCE) on carbon steel C37 in 1 M HCl. Initially, the chemical profile of PCE was analyzed using gas chromatography/mass spectrometry (GC/MS), and myristicin and apiol were identified as the main components. The results from the weight loss, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP) techniques revealed a substantial reduction in the corrosion rate upon the use of PCE, with a maximum inhibition efficiency of 92% at 1 g L−1 PCE. To optimize the performance, the corrosion behavior was investigated over a temperature range of 303–333 K and for concentrations of 0.1–1 g L−1. The inhibition effectiveness increased at higher concentrations of PCE, whilst it decreased when the temperature was elevated. The query suggests that the adsorption process involves both physical and chemical mechanisms. The adsorption of PCE onto C37 was well described by the Langmuir adsorption isotherm. The data were used to determine the activation energy and thermodynamic parameters. The PCE coating acted as a mixed-type inhibitor, hampering both cathodic and anodic corrosion reactions. SEM further confirmed the formation of a protective coating film on the steel surface when exposed to PCE. UV-Vis and XRD were implemented to understand the inhibition mechanism and formed products at the microscopic and spectroscopic levels. Hence, the green PCE inhibitor may potentially be applied in corrosion mitigation due to its high corrosion protection efficacy and its environmentally benign nature.
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DOI: 10.3390/coatings14070783
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