A Novel Bis-Phenylurea-Based Aliphatic Amine as an Efficient Green Corrosion Inhibitor for Carbon Steel in Hcl Solution: Experimental and Theoretical Study

A novel bis-phenylurea-based aliphatic amine (BPUA ) was prepared via a facile synthetic route, and evaluated as a potential green organic corrosion inhibitor for carbon steel in 1.0 M HCl solutions. The inhibitory behavior of the prospective green corrosion and the corresponding inhibition efficiency were investigated employing the PDP and EIS techniques, as well as DFT-based quantum chemical calculations. Obtained results revealed an efficiency of 95.2% at an inhibitor concentration of 50 mg.L-1 after one hour of exposure to the corrosive medium at 25 °C. The electrochemical results revealed that the corrosion inhibition process is driven by the adsorption of BPUA derivative on the surface of C-steel that obeys the Langmuir isotherm with mixed physisorption/chemisorption modes. The SEM morphology analysis validates the electrochemical measurements and substantiates the corrosion-inhibiting properties of BPUA. Additionally, the eco-toxicity assessment revealed the potentiality of the environmental friendliness of the BPUA derivative. the DFT calculations correlated the inhibitor's chemical structure with the corresponding inhibitory behavior.