Abstract
The present research aimed to investigate the impact of some synthetic derivatives of pyridone (6-amino-1-(4-hydroxyphenyl)-4-(4-methoxyphenyl)-2-oxo-1,2-dihydropyridine-3,5-dicarbonitrile (PYR-2) and 6-amino-1-(4-hydroxyphenyl)-2-oxo-4-phenyl-1,2-dihydropyridine-3,5-dicarbonitrile (PYR-3))on copper corrosion inhibition behavior in HCl acid solution using electrochemical methods, including potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS). Using FTIR, (HNMR)-H-1, and mass spectroscopy methods, the two compounds ((PYR-2) and (PYR-3)) were confirmed and characterized. With the two compounds added to corrosive media, the double-layer capacitance value decreases. In the case of 18 x 10(-5) M, they reached maximum efficiency of 91.9% and 90.3%, respectively. Having studied its behavior during adsorption on copper, it was concluded that it follows chemical adsorption and Langmuir isotherm and may be considered mixed-type inhibitors.