Abstract
The corrosion performance of aluminum in 1 M hydrochloric acid solution in the existence and absence of Candesartan drug was examined utilizing, potentiodynamic polarization (PDP) and AC impedance (EIS) tests. It was found that the inhibition efficacy (%IE) of Candesartan drug was influenced by its doses and temperature and reached to 92.9% at 40x10-6 M, 30oC. The adsorption isotherm agreed with Langmuir model. From Tafel data the investigated Candesartan drug acts as mixed kind inhibitor. The influence of temperature on the rate of dissolution and the thermodynamic parameters in the existence and absence of Candesartan drug were also, studied and explained. All tests gave similar results.
Highlights
Aluminum and its alloys have been the subject of numerous studies due to their high technological value and wide range of industrial applications, especially in the aerospace and household industries
This indicates that the dissolution mechanism that is not affected by the presence of Candesartan drug [33]
The difference in electrochemical corrosion potential (Ecorr) values is small (9 mV) and this assured that the Candesartan drug works as a mixed type of inhibitor
Summary
Aluminum and its alloys have been the subject of numerous studies due to their high technological value and wide range of industrial applications, especially in the aerospace and household industries. Aluminum corrosion resistance is based on the formation of a lightweight, adherent passive oxide film in a variety of environments This amphoteric surface film dissolves significantly when the metal is exposed to high doses of acids or bases [1]. The inhibitive effect some antibacterial drugs, namely Ampicillin, Cloxacillin, Flucloxacillin and Amoxicillin towards the corrosion of Al was investigated [28] Among these cephalosporins, cefadroxil, cefazolin and cefalexin are utilized as corrosion inhibitors of Fe in acidic media [29,30,31,32]. Candesartan drug, which is the subject of this study, is non-toxic, inexpensive, and environmentally friendly medications used to treat hypertension It has reactive centers like N, O atoms with lone pairs of electrons and aromatic rings with delocalized π- electron systems, which can aid adhesion to metal surfaces.
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