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The  Uncaria Cordata  as corrosion inhibitors for mild steel (MS) in a 1.0 M hydrochloric acid (HCl) solution. The EIS, polarization, and LPR measurements were used as experimental measurements to confirm the anti-corrosion performances of the  Uncaria Cordata  at room temperature. The corrosion inhibitors, even at a low dosage range, achieved inhibition efficiencies to a maximum of 97.0% for 400 ppm of  Uncaria Cordata . Surface morphology  via  AFM and SEM/EDX was carried out to validate the presence of protected film and an optimum concentration of each extract above the metal’s surface in the corrosive acidic solution. The Δ Goads  value − 19.70 kJ/mol proved a spontaneous merge of physical and chemical adsorption by the extract compounds at the interface of MS and the HCl solution. DFT was governed to accommodate the elevated inhibition efficiency upshot obtained by the electrochemical tests and recommend a synergy mechanism for most of the adsorbed active compounds in  Uncaria Cordata  inhibitors with the MS surface. Monte Carlo simulation indicates three active compounds, namely  1 ,  2 , and  8,  found to have parallel adsorption on MS. This encourages the highest surface coverage and shields the MS surface from the intrusion of corrosive agents.

journal of adhesion science and technology

Environmentally conscience corrosion inhibitors for mild steel in corrosive hydrochloric acid solution by  Uncaria Cordata  extract: experimental and theoretical studies