Adsorption, Electrochemical Behavior, and Theoretical Studies for Copper Corrosion Inhibition in 1 M Nitric acid Medium using Triazine Derivatives

This study evaluated, the corrosion inhibition behavior of some triazine derivatives, including 2,4-diphenyl-6-((1E)-1-(4-phenyl-2-(phenyldiazenyl)tetraaz-3-en-1-ylidene)ethyl)-2,3,4,5-tetrahydro-1,2,4-triazine (TA-1) and 2,4-diphenyl-6-((E)-1-((E)-4-phenyltetraaz-2-en-1-ylidene) ethyl)-2,3,4,5-tetrahydro-1,2,4-triazine (TA-2) were surveyed for copper corrosion in 1 M HNO₃ solutions by using electrochemical methods, such as potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS). PP plots showed that the examined (TA-1) and (TA-2) are virtuous compounds for the copper corrosion inhibition in 1 M HNO₃ solutions, and they assume the role of mixed-type inhibitors. Double layer capacitances reduce referring to blank solution once the examined inhibitors were added. The inhibition efficiency reached maximum values of TA-1 and TA-2 are 91.4%, 88.9 at 10^-4M, respectively. The copper surface processed with the examined components was anatomized by X-ray photoelectron spectroscopy to verify the formation of adsorbed protective barrier. The examined components followed Langmuir adsorption isotherm; they were adsorbed on copper through chemisorption adsorption. Density functional theory (DFT) calculations and MC simulations were performed to assist the adsorption characteristics and the mechanism of corrosion inhibition using the examined inhibitors. Moreover, the examined inhibitors were used as adsorbate on the Cu (1 1 1) surface and, the adsorption energy was detected on copper exterior.