Abstract
The inhibiting effect of some chalcones derivatives on the corrosion of carbon steel in 1 M HCl was studied by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The results showed that the inhibition efficiency increases with increasing the inhibitor concentration, while it decreases with increasing the temperature. The adsorption of chalcones derivatives on the carbon steel surface obeys Langmuir adsorption isotherm. Some thermodynamic parameters were calculated and discussed. The values of free energy of adsorption for investigated inhibitors were calculated. Polarization curves showed that chalcones derivatives are mixed-type inhibitors but the cathode is more polarized than the anode. The variation in inhibition efficiency depends on the type of the substituent groups in the benzene ring. It was found that the presence of donating group (such as OCH3) better facilitates the adsorption of molecules on the surface than in the case with withdrawing groups (such as – Cl and NO2). The data obtained from the four different methods were in good agreement. Key words: Carbon steel, HCl, corrosion inhibition, electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), chalcones derivatives.
Highlights
Hydrochloric acid is often used as a pickling acid for iron and its alloys
The corrosion inhibition of carbon steel becomes of such interest to do because of its widely used as a constructional material in many industries and this is due to its excellent mechanical properties and low cost
The weight loss-time curves of carbon steel with the addition of inhibitor (1) in 1 M HCl at various concentrations is shown in Figure 1
Summary
Hydrochloric acid is often used as a pickling acid for iron and its alloys. the corrosion inhibition of carbon steel becomes of such interest to do because of its widely used as a constructional material in many industries and this is due to its excellent mechanical properties and low cost. To make secure from attack of acid, inhibitors are frequently used (Trabanelli, 1991; Abd El Rehim et al, 2001). Organic heterocyclic compounds have been used for the corrosion inhibition of iron (Arawaki et al, 1987; Ashassi-Sorkhabi and Ghalebsaz-Jeddi, 2005; Banerjee and Malhotra, 1992; Bayol et al, 2007; Benabdellah et al, 2007; Benalli et al, 2007), copper (Bessone et al, 1983), aluminum Bosch et al, 2001; Branzoi et al, 2002; Da Costa and Agostinho, 1989), and other metals (Damaskin et al, 1971; Elachouri et al, 1995) in different corroding media
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