Adsorption and Anticorrosion Behavior of Expired Meloxicam on Mild Steel in Hydrochloric Acid Solution
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dsorption and Anticorrosion Behavior of Expired Meloxicam on Mild Steel in Hydrochloric Acid Solution A. S. Foudaa, *, F. I. El-Dossokib, A. El-Hossianyc, and E. A. Selloa aDepartment
of Chemistry, Faculty of Science, El-Mansoura University, El-Mansoura, 35516 Egypt of Chemistry, Faculty of Science, Port Said University, Port Said, 42526 Egypt c Delta for Fertilizers and Chemical Industries, Talkha, Dakahleya, 1179 Egypt *e-mail: [email protected]
bDepartment
Received June 24, 2019; revised August 7, 2019; accepted August 14, 2019
Abstract—The inhibiting effect of the expired meloxicam on the corrosion of mild steel (MS) in 1 M HCl was tested by the weight loss, electrochemical frequency modulation, potentiodynamic polarization (PP) and electrochemical impedance spectroscopy techniques. The PP curves showed that this drug acts as mixed type inhibitor. This drug was adsorbed chemically on the MS surface following the Temkin adsorption isotherm. Some thermodynamic parameters were computed and discussed. The results indicated that the protection efficiency increases by raising both the doses of the inhibitor and the temperature of the medium. The morphology of the MS surface was analyzed by scanning electron microscopy, atomic force microscopy, and Fourier transform infrared spectroscopy. All of the obtained results from different techniques are similar. Keywords: acid corrosion, mild steel, expired meloxicam, scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy DOI: 10.3103/S1068375520040055
INTRODUCTION Corrosion is an important process to take into account from the points of view of its significant role in safety and economics‚ mainly for metals. Steel and its alloys are widely used in various constructions, for example, of tanks, petroleum refineries equipment, pipes, etc. The main problem of using steel alloys is its aggressive reaction in acidic solutions. Several acids solutions (HCl, H2SO4, H3NO3S or NH2SO3H, H3PO4) are used to remove the unwanted scale and rust in many industrial processes. Among the commercially available acids, the most frequently used one is HCl. Inhibitors are generally used in these processes to control Fe and Fe alloys dissolution as well as the consumption of acids [1, 2]. Numerous inhibitors utilized are either created from low-cost raw materials or selected from compounds having hetero atoms in their long-chain carbon or aromatic system [3]. Most of organic inhibitors are costly, toxic, and have negative effect on the corrosion of metal. Thus, it is significant and essential to develop environ-mentally safe and low-cost corrosion protection [4]. Organic heterocyclic compounds have been utilized for the corrosion hindrance of C-steel [5–10], Cu [11], Al [12–14], and other metals [15] in various aqueous media. Adsorption of an inhibitor facilitates the protection of the metal surface [16]. The selection of a drug for inhibition of corrosion is based on the following: (1) drug
molecules contain oxygen, sulphur and nitrogen as active sites,
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