Inhibition effect of Tantum Rosa drug on the corrosion of copper in 3.5 wt.% NaCl solution

In the present paper, the inhibition performance of benzydamine hydrochloride drug, commercially named Tantum Rosa on copper was investigated in 3.5 wt.% NaCl solution. Potentiodynamic polarization, electrochemical impedance spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy were employed. The electrochemical results revealed that Tantum Rosa acts as a mixed-type inhibitor on the copper corrosion and its protective effectiveness is concentration and time-dependent. The inhibiting efficiency of Tantum Rosa was improved with the increase in the drug concentration and reached the maximum value of 91.5% at 5 mM. The inhibitive effect of Tantum Rosa was afforded to its spontaneous adsorption on the copper surface, through combined physical and chemical processes, according to Langmuir adsorption isotherm. The time-weakening of the inhibitor film stability leaded to a progressive decay of the inhibition ability of Tantum Rosa at prolonged exposure. SEM-EDX analysis confirmed that the surface morphology of copper was significantly improved in the presence of the inhibitor.

Automated summary

The inhibitory performance of benzydamine hydrochloride drug, known as Tantum Rosa, on copper corrosion in 3.5 wt.% NaCl solution was investigated in this study. It was found that Tantum Rosa acts as a mixed-type inhibitor, with its protective effectiveness depending on concentration and time. The inhibiting efficiency of Tantum Rosa increases with higher drug concentration and reaches a maximum of 91.5% at 5 mM. The inhibitive effect is attributed to the spontaneous adsorption of Tantum Rosa on the copper surface, following Langmuir adsorption isotherm. However, the stability of the inhibitor film weakens over time, leading to a gradual decay of the inhibition ability of Tantum Rosa.