Adsorption and Corrosion Inhibition Performance of 2-(p-bromobenzylthio)-1H-benzimidazole for Q235 Steel in HCl Solution

The new organic corrosion inhibitor of 2-( p -bromobenzylthio)-1 H -benzimidazole (Br-BBD) was synthesized in this work. After prepared, the adsorption and corrosion inhibition performance of Br-BBD for Q235 steel in HCl solution were studied using EIS, SEM, polarization measurement and WLM (weight loss measurement). The results exhibit that Br-BBD acts as an excellent corrosion inhibitor for Q235 steel in HCl solution, and the inhibition efficiency can reach up to 98.07% when the Br-BBD concentration is 50 mg L -1 in 1.0 M HCl at 25°C. In addition, the adsorption of the mixed-type inhibitor of Br-BBD on Q235 steel surface obey Langmuir adsorption isotherm, which is governed by spontaneous chemisorption mechanism.