Abstract
An anticorrosion activity of 8-quinoline sulphonyl chloride (8-QSC) on mild steel in 1 M HCl solution was studied by weight loss (WL) method and electrochemical methods, namely, electrochemical impedance spectroscopy (EIS), Tafel polarization (TP), and linear polarization resistance (LPR). Results obtained from WL method, EIS, TP, and LPR, showed that 8-QSC is a good corrosion inhibitor for mild steel in 1 M HCl solution. The results indicated that the inhibition efficiency and extent of surface coverage were increased with increase in inhibitor concentration and decrease in the corrosion rate. This is due to the formation of protective film on the surface of mild steel. Adsorption of 8-QSC on the mild steel surface was found to obey the Langmuir adsorption isotherm. A Tafel plot indicates that the used inhibitor behaves predominantly as cathodic type. The surface morphology of the mild steel was studied by Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray (EDX) Spectroscopy techniques. All the methods give the same order of inhibition efficiencies.
Highlights
Corrosion is the destruction of metals and alloys by chemical interaction with their environment
Active metals like mild steel, Zn, Al, and Cu are employed in various industries for fabrication purposes due to their low cost and easy availability, where surfaces are rapidly damaged in acid media [1, 2]
The values of corrosion behavior of mild steel in 1 M HCl solution in the absence and presence of various concentrations of inhibitor from weight loss measurements are given in Table 1 and Figures 2(a) and 2(b)
Summary
Corrosion is the destruction of metals and alloys by chemical interaction with their environment. The organic compounds containing nitrogen, oxygen, sulphur, and phosphorous, heterocyclic compounds with a polar functional group, and conjugated double bonded or triple bonded compounds have been widely used as acid inhibitors [6,7,8]. Heterocyclic compounds, such as pyridine, pyridine derivatives, pyrazole, triazole, tetrazole, and benzothiazole derivatives, have been reported and they show better inhibition efficiency for metals especially mild steel in different media [6, 9]. The inhibitor molecules get bonded to the mild steel surface by chemisorption, physisorption, or complexation with the polar groups acting as the reactive centers in the molecules [11]
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