article · Coatings
A biodegradable, non-toxic biopolymer named CHA was extracted from the plant Artemisia herba-alba in eastern Morocco and tested as a corrosion inhibitor for mild steel in an acidic hydrochloric acid environment. Electrochemical testing demonstrated that the extract acts as an effective protective agent, achieving an inhibition efficiency of 96.17 per cent at a concentration of 800 milligrams per litre. Polarisation measurements revealed that the extract behaves as a mixed-type inhibitor, significantly lowering the corrosion current density. Surface analysis using scanning electron microscopy confirmed the formation of a physical protective layer across the metal surface. The adsorption process was found to adhere to the Langmuir isotherm model through electrostatic and covalent interactions. Theoretical computational simulations supported these experimental observations.
Industrial processes frequently expose steel infrastructure to harsh acidic environments, leading to rapid deterioration. Conventional chemical inhibitors used to prevent this damage can be toxic to handlers and harmful to ecosystems. Demonstrating that a plant-derived, biodegradable polymer provides high-performance corrosion protection offers a safer, environmentally benign alternative for metal preservation while valorising natural botanical resources.
This work points towards green anti-corrosion additives for industries that handle acidic solutions, such as industrial cleaning, pickling, and chemical processing. Because the findings are based on laboratory-scale electrochemical testing, microscopy, and computational modelling, the technology is at an early research stage. Practical deployment would require piloting scalable extraction methods, assessing performance in flowing or high-temperature systems, and evaluating long-term formulation stability.
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In this modest work, a local biopolymer (CHA), biodegradable, non-toxic, and soluble in acidic media, was extracted from the plant Artemisia herba-alba located in the eastern region of Morocco, and characterized by FT-IR, in order to valorize it as a corrosion inhibitor of mild steel in 1 M HCl medium. The electrochemical tests show that the extract is an excellent corrosion protective agent, reaching a maximum value of 96.17% at the concentration of 800 mg/L in the inhibitor. The potentiodynamic polarization (PDP) curves indicate the mixed behavior of the extract, to reduce the current density from 3.445 mA/cm2 to 0.104 mA/cm2 in the presence of 800 mg/L in the inhibitor. The biopolymer CHA of the extract of Artemisia herba-alba undergoes the Langmuir adsorption isotherm, whose adsorption energy is −20.75 kJ/mol, which is attributed to the presence of electrostatic and covalent bonds. In addition, the visualization of the metal surface by a scanning electron microscope (SEM) indicates the formation of a protective layer formed by the extracts of Artemisia herba-alba, which confirms the protective characteristic of the extract used. Theoretical investigations by DFT, MD, and MC confirm previous experimental results.
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DOI: 10.3390/coatings13030611
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