Adsorption Properties and Inhibitive Effect of Antibacterial Drug on Carbon Steel Corrosion in HCl Medium

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The corrosion inhibition of carbon steel in 1.0 M HCl by antibacterial drug named Cephradine (CPD), has been investigated by weight loss and potentiodynamic polarization techniqes. The results showed that CPD is an effective inhibitor for the carbon steel corrosion in acidic solution. The inhibition efficiency increases with increasing inhibitor concentration, while it decreases with the increase in solution temperature. Thermodynamic parameters were calculated and discussed. Adsorption characteristics of the inhibitor has been studied and it is found that cephradine inhibits the corrosion of carbon steel by being adsorbed on the surface of carbon steel by a physical adsorption mechanism. The adsorption of the inhibitor was also found to be spontaneous and consistent with the assumptions of Langmuir adsorption isotherm. Surface analysis using energy dispersive X-ray ( EDX) and scanning electron microscope (SEM) was applied to confirm the inhibition efficiency of cephradine.

Corrosion inhibition; Cephradine; carbon steel; polarization; adsorption