The corrosion performance of carbon steel after wide-ranging acquaintance load of aqueous extract of Lawsonia inermis (LI) as a green inhibitor in saline media was inspected. These studies have been supported by means of open-circuit potential (OCP), potentiodynamic polarization technique (PD) and electrochemical impedance spectroscopy (EIS). In addition, the scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) analysis stayed applied as a complementary tool for surface characterization. For more illustration theoretical and statistical studies were subjected for corrosion inhibition efficiency. All results inveterate that, the carbon steel alloy corrosion rate decreases with the upsurge of inhibitor concentration and LI are an important deterrent for the saline solutions to corrosion of carbon steel alloy. The presence of LI particles anywhere decreased the cathodic, anodic and corrosion currents and the rate of deterioration, as well as improved polarization and solvent resistance of carbon steel alloy in the saline electrolyte. Statistical tests using the Box–Behnken process stayed used to observe the effect of principal parameters (i.e., concentration of inhibitors, temperature, and speed of rotation) on the effectiveness of inhibition and corrosion level of carbon steel alloy.