Corrosion inhibition potentiality of some benzimidazole derivatives for mild steel in hydrochloric acid: Electrochemical and weight loss studies

Abstract

The adsorption and inhibition effects of three benzimidazole derivatives (BDD), namely: 2-(2-pyridyl)benzimidazole (PBD), 2-bromo-1H-benzimidazole (BrBD), and 2-chlorobenzimidazole (ClBD) on mild steel corrosion in 1 M HCl have been studied by electrochemical and weight loss methods. Results showed that inhibition efficiency increases with concentration and maximum value was obtained at 5·10 -3 M concentration. From the results, it is concluded that the BDD inhibited mild steel corrosion in 1 M HCl by adsorbing on the metal surface. Polarization results showed that the BDD act as mixed type inhibitors. The adsorption of BDD onto the mild steel surface was described by the Langmuir adsorption isotherm.

Polyaniline/chitosan as a corrosion inhibitor for mild steel in acidic medium

“…29 Polarization curves indicated that both anodic metal dissolution and cathodic hydrogen evolution reactions were affected by the addition of PANI/CTS, with the parallel nature of the Tafel lines suggesting that an activation-controlled hydrogen evolution reaction was occurring. 30,31 Changes to the E corr value were less than 85 mV, providing evidence that the PANI/CTS inhibitor functioned as a mixed-type inhibitor that shied in a positive direction for increased inhibitor concentration. 32 I corr values were found to decrease for increased PANI/CTS concentrations, which was due to a greater fraction of the steel surface being covered.…”

Valorization of the essential oil of Myrtus communis by its use as a corrosion inhibitor of mild steel in acidic medium 1.0 M HCl

“…As shown in Figure 1, the addition of MCO results in reducing both anodic and cathodic currents and without changes in the E corr value, indicating that MCO is a mixedtype inhibitor. Consequently, we can state that the mechanism of corrosion reactions does not change in presence of the inhibitor and the inhibition action is achieved by a simple blocking mechanism [17,18]. Thus, all the calculations in our study were based on this assumption.…”

Azole-Based Compounds as Corrosion Inhibitors for Metallic Materials

“…An additional strategy to enhance the performance of benzimidazole to inhibit metallic corrosion is the combination of the latter heterocyclic molecule with other aromatic systems like benzene or triazole core rings without and with further substituent groups. Under this view, various hybrid benzimidazole/aromatic ringbased derivatives have been reported as anti-corrosion molecules [79][80][81][82][83][84][85][86]. Figure 9 summarizes some benzimidazole/aromatic ring class inhibitors, as well as corresponding inhibition data.…”