A combined experimental and theoretical research of the inhibition property of 2-((6-chloropyridazin-3-yl)thio)-N,N-diethylacetamide as a novel and effective inhibitor for Cu in H2SO4 medium

Abstract To alleviate the ever-increasing concerns about environmental protection, developing green, environmentally friendly, and efficient corrosion inhibitors for metal materials in corrosive environment is important. Herein, an eco-friendly pyridazine derivative, 2-((6-chloropyridazin-3-yl)thio)-N,N-diethylacetamide (CPD), was explored as an efficient inhibitor for Cu in 0.5 mol/L H2SO4 via electrochemical/surface-analytical experiments and theoretical calculations at 298 K, 303 K, 308 K, and 313 K. The experimental studies demonstrate that CPD is a modest cathodic corrosion inhibitor and its adsorption onto the copper/solution surface accord with the Langmuir monolayer adsorption; thus, the coordination bonds between CPD and Cu were discussed. Theoretical calculations further revealed the mechanism of inhibition of CPD. This work may provide additional insights into the use of high-performance inhibitors for Cu.