Expired dapagliflozin as a promising corrosion inhibitor for copper in 1.0 M nitric acid: Experimental and computational validation

The efficacy of expired dapagliflozin drug(DAP) mitigating corrosion on copper (Cu) in 1.0 M HNO3 was explored employing a combination of experimental and theoretical approaches. Chemical and electrochemical methods were applied to assess the anticorrosion efficacy at various inhibitor concentrations and temperatures. The outcomes revealed that the anticorrosion efficacy of expired DAP is high and rises with drug concentration, while it diminishes with rising temperature. This proves that physical adsorption of expired DAP onto the Cu surface is the predominant mechanism. The PDP experiments' findings demonstrated that expired DAP functions as a mixed-type inhibitor. Expired DAP acted as a pitting corrosion inhibitor by causing a significant shift in pitting potential in the positive directions. Furthermore, the thermodynamic properties of the kinetic activation and adsorption processes have been estimated and analyzed. The inhibiting impact of expired DAP is believed to be the development of a complex between the DAP and Cu+2 ions adsorbed on the Cu surface. The stoichiometry of Cu+2 /DAP is 1:1 according to the conductometric titration. The adsorption of the complex minimized the rate of corrosion and enhanced the inhibitory properties. Theoretical analyses confirm that DAP exhibits a strong tendency to absorb onto the Cu surface, reflecting its remarkable inhibitory potential. Furthermore, the significant agreement between the theoretical predictions and the experimental findings highlights the consistency of the applied approaches and strengthens confidence in the reported results.