Abstract
The corrosion protection of stainless steel 304 (SS 304) in 2M HCl solutions using Clindamycin antibiotic was investigated by weight loss (WL), electrochemical frequency modulation (EFM), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PP) tests. Electrochemical results showed that this compound is an efficient inhibitor for SS304 and the efficiency reached 93 % at 300 ppm. The inhibition efficiency (IE) increases with the drug concentration and decreases with rising temperature. Data from electrochemical measurements suggested that the drug functioned by adsorption of the molecule on the metal/corroding interface, inhibiting both the cathodic and anodic half-reactions of the corrosion process. The adsorption of this drug on SS304 surface follows Langmuir adsorption isotherm. The thermodynamic functions of activation and adsorption processes were calculated and discussed. The surface morphology of the SS304 specimens was evaluated using atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR).
Highlights
steel 304 (SS 304) has found wide applications in a variety of industries
The objective of this study is to investigate the corrosion behavior of SS 304 in 2M HCl at different temperatures in the presence of Clindamycin antibiotic using chemical and electrochemical
Values of % inhibition efficiency (IE) increases with increasing drug concentration and decreases with rising in temperature due to the increase of desorption of drug molecules from SS304 surface
Summary
SS 304 has found wide applications in a variety of industries. It is covered with a highly protective film of chromium oxyhydroxides and is resistant to corrosion in many aggressive environments. Hydrochloric acid is one of the most widely used regular aggressive solutions [8,9,10,11]. Heterocyclic compounds such as an antibiotic (pharmaceutical drugs) can provide excellent inhibition
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