Fig. 1

A schematic representation of the experimental techniques used to evaluate the corrosion inhibition performance of Gemini cationic surfactants for carbon steel in 1 M HCl, both in the absence and presence of inorganic salts. The methods include weight loss measurements, electrochemical techniques (open circuit potential, potentiodynamic polarization, electrochemical impedance spectroscopy), surface analysis (SEM, EDX, FTIR), and computational studies (DFT).