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Caesalpinia Crista (Kanchaki) as Green Corrosion Inhibitor for Zinc in Hydrochloric Acid Solutions

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Abstract

A study aims to inspect the surface adsorption of Caesalpinia Crista seed (Kanchaki seed) extract as a developing anti-corrosion additive for zinc in acidizing solutions. The study utilizes various experimental approaches like the mass loss, electrochemical impedance spectroscopy (EIS), and potentio-dynamic polarization (PDP). The study achieves high inhibition efficiencies of 99.4%, 85.0%, and 94.8% in mass loss, potentiodynamic studies, and EIS, respectively at a higher concentration (2.0 g/L) of KSE and a temperature of 303 K. Impedance analyses revealed an increase in charge transfer at the zinc-solution interface upon the addition of the KSE. PDP measurements indicated a significant reduction in corrosion current density when using Kanchaki seed extract (KSE), suggesting its role as a mixed-type corrosion inhibitor. The adsorption of the KSE on the zinc substrate followed the Langmuir isotherm, involving a physical adsorption mechanism. Surface analysis, conducted through contact angle and scanning electron microscopy - energy dispersive X-ray (SEM-EDX) and atomic force microscopy (AFM) measurements, provided additional support for the adsorption of the inhibitor on the zinc substrate. Fourier transform infrared spectroscopy (FT-IR) was utilized to calculate the KSE’s functional groups. The experimental outcomes obtained from all the applied approaches show good agreement.

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The authors appreciate the lab and library resources provided by the Arts Science and Commerce College’s Chemistry Department in Kholwad, Surat, India.

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Desai, P.S., Parmar, B.B., Desai, F.P. et al. Caesalpinia Crista (Kanchaki) as Green Corrosion Inhibitor for Zinc in Hydrochloric Acid Solutions. Chemistry Africa 7, 2173–2187 (2024). https://doi.org/10.1007/s42250-023-00874-2

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