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The mass-loss, polarization tests, and electrochemical impedance spectroscopic strategies were applied to assess the inhibition performance of the environmentally friendly inhibitor Araucaria heterophylla leaves extract (AHLE) for soft-cast steel corrosion safety in 1 M HCl at 300 ± 1 K. The environmentally friendly inhibitor creates a protective coat on soft-cast steel that decelerates the corrosion process in acidic environments. The percentage inhibition effectiveness, corrosion current density, corrosion potential, cathodic and anodic Tafel slopes are being assessed. The outcomes of chemical and electrochemical research are almost similar. The inhibitor's inhibition activity was well illustrated by the AHLE adsorption on soft-cast steel follows the Langmuir adsorption isotherm. According to the study, AHLE is a mixed kind of inhibitor. Experiments were conducted with varying inhibitor amounts and temperatures. The calculated Δ𝐺 𝑜 ads values were in the range of −33.75 to −34.40 kJ/mol, which discloses the corrosion inhibitory action is exothermic and spontaneous. Scanning electron microscopy, Fourier transform infrared spectroscopy, and contact angle techniques were used to determine the association of the AHLE on the metal surface.

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The inhibition action of environmentally sustainable inhibitor Cycas revoluta leaves extract (CRLE) for corrosion protection of soft-cast steel in a solution of HCl was assessed with electrochemical and chemical methods. The ecofriendly inhibitor forms a thin coating on soft-cast steel and slows the corrosion in acid media. The percent inhibition performance, corrosion current density, corrosion potential, and both anodic and cathodic slopes for Tafel were calculated. The results for electrochemical and chemical research are in beneficial correlation with each other. The inhibitor's inhibitory ability was well illustrated by the CRLE adsorption on soft-cast steel followed the Langmuir isotherm.The investigations reveal that CRLE is a mixed form of inhibitor. Studies were performed with varying inhibitor amounts and temperatures. Thermodynamic parameters were calculated, and it shows that the corrosion inhibition effect is spontaneous and exothermic. The interaction of the plant extract was characterized by SEM, FTIR, contact angle measurements, and AFM techniques.