The first electrochemical and surface analysis of 2-aminobenzimidazole as a corrosion inhibitor for copper in chloride solution

Abstract

High corrosion inhibition effectiveness of 2-aminobenzimidazole is proven after a long-term immersion period in 3 wt% NaCl solution.

Electrochemical and Surface Analysis of 2-Phenylimidazole Adsorbed on Copper from Chloride Solution

“…Moreover, the PD curves are transferred to the lower current densities (especially the anodic part) for 1 mM concentration (Figure 2b). Due to the most significant corrosion inhibition effect of the 1 mM concentration and since this concentration was employed previously [5][6][7][8][9][10][11][12] (which will allow comparison of the results), we have employed only 1 mM concentration for the detailed corrosion study that follows below. …”

“…In addition, the cyclic voltammogram of the noninhibited copper samples under the same conditions, reported previously [5], is also given (Figure 3). A potential sweep rate of 20 mV s −1 was used to perform both CV experiments.…”

“…The same solution and sample preparation procedure was used as reported previously [5]. Immersion tests, all the electrochemical measurements, as well as surface characterization (including ATR-FTIR, 3D-profilometry, contact angle and FE-SEM analyses) were performed in the same manner as explained in detail in [5,7,9]. For the electrochemical measurements Gamry 600™ instrument (Warminster, PA, USA) was employed.…”

“…Several other azole compounds have been previously reported as effective corrosion inhibitors for copper in chloride solutions. Previously, we demonstrated for the first time that 4-methyl-2-phenyl-imidazole (MePhI) [6,13] and 2-aminobenzimidazole [5] are effective corrosion inhibitors for copper in 3 wt.% NaCl solution. Since MePhI is an effective corrosion inhibitor, a question that arises is whether the methyl group in that compound is crucial for the adsorption process (compare the structures in Figure 1).…”

“…Corrosion inhibitors are dissolved in a corrosive medium at very low concentrations. Numerous studies have been performed at 1 mM concentration of corrosion inhibitor [5][6][7][8][9][10][11][12]. Copper is one of the most important metals among the nonferrous materials; however, it suffers from corrosion in chloride-containing media.…”