Natural Corrosion Inhibitor from Cistanche Tubulosa Extract for Carbon Steel in HCl: Gravimetric and Electrochemical Characterization

Document Type : Original Article

Authors

1 Department of Process Engineering, Higher School of Technology, Sultan Moulay Slimane University, P.O. Box: 23000, Beni-Mellal, Morocco

2 Department of Chemistry and Environment, Faculty of Science and Technology, Sultan Moulay Slimane University, P.O. Box: 23000, Beni-Mellal, Morocco

Abstract

The escalating environmental concerns associated with toxic inorganic inhibitors have spurred the exploration of green alternatives for Oxidation prevention in acid pickling processes. The corrosion behavior of Carbon steel (CS) in 1 M HCl solution was investigated via weight loss (WL), potentio-dynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) techniques. The influence of the eco-friendly corrosion inhibitor, cistanche tubulosa (CT), was evaluated. PDP measurements indicated that cistanche tubulosa exhibits mixed-type inhibitory properties, effectively reducing the corrosion rate of CS through adsorption onto its surface. This inhibitory effect resulted in an inhibition efficiency with a value higher than 92 % at 298 °K. The Langmuir isotherm model is the most acceptable one to describe the adsorption of extract on the surface of carbon steel. Scanning electron microscopy (SEM) was employed to characterize the morphology of the CS surface, confirming the layering of the barrier film on the CS surface and suggesting a chemisorption mechanism for cistanche tubulosa molecules. Additionally, Fourier-transform infrared spectroscopy (FTIR) analysis was performed to identify the functional groups responsible for the adsorption process. The temperature's influence on the anticorrosive efficiency was examined within the temperature interval of 298-328 °K. Results demonstrated an improvement in the ability to inhibit corrosion with an increase in inhibitor concentration and contact time, but this improvement decreased with increasing temperature.

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References

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Progress in Color, Colorants and Coatings
Volume 19, Issue 1 - Serial Number 60
September 2025
Pages 67-82

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