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Our study presents the investigation of the inhibitive performances of Spinacia oleracea (spinach) and Raphanus sativus (radish) hydroalcoholic leaves extracts on mild steel corrosion in acidic environments. The spinach and radish leaves extracts were obtained under green conditions (microwave assisted extraction and ethanol as biodegradable solvent). The extracts were added in the corrosive solutions at a concentration of 0.5 g·L-1. The inhibition of the corrosion of mild steel in H2SO4 solution by the plant extracts has been studied using the weight loss method. Both extracts inhibit steel corrosion in 0.1 M H2SO4, but Raphanus sativus extract proved slightly higher corrosion inhibition efficiency (78 %) than Spinacia oleracea the extract (75 %).

Anticorrosion potential of mild steel by Hydralazine as corrosion inhibitor for mild steel in 1M hydrochloric acid was investigated by chemical and electrochemical measurements at 303-333 K temperature. The maximum inhibition efficiency of inhibitor by Weight loss method is around 90%, Tafel polarization method is around 85%; electrochemical impedance spectroscopy measurement around 90% at 1250 ppm of Hydralazine in. The result shows that the inhibition efficiency increases with I 1M hydrochloric acid. Hydralazine acts as a mixed type inhibitor which inhibits the corrosion of mild steel due to the adsorption on metal surface. This adsorption system obeys the Langmuir adsorption isotherm.Activation parameters explains the effect of temperature with inhibition efficiency of inhibitor molecule.SEM images of inhibited mild steel strips shows a formation of passive protective film over the surface.