2-Mercaptobenzimidazole compounded with the conventional sealer B72 for the protection of rusted bronze

The corrosion inhibition effect, reinforcement effect and penetration effect of rusted bronze before and after the compounding of 2-mercaptobenzimidazole (MBI) with B72 (Paraloid B72) were investigated using surface analysis and electrochemical techniques. Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy (Raman), X-ray photoelectron spectroscopy (XPS) and quantum chemical computing techniques were used to explore the mechanism of corrosion mitigation further. In addition, an electronic universal testing machine was used to test the ability of the material to reinforce different rust compositions before and after compounding. The dynamic potential polarization method was used to determine the composite scheme's optimal corrosion inhibition ratio and study the corrosion inhibition effect. The experimental results showed that the best corrosion inhibition effect was achieved at the ratio of MBI/B72 ratio 3:7, and the corrosion inhibition efficiency was 97.84 % under these conditions. Most of the MBI molecules used by us presented prominent permeation adsorption behavior. They formed uneven films of Cu(I)-MBI and Cu(II)-MBI coordination compounds on the surface of the rust layer. Finally, B72 combines with MBI molecules through hydrogen bonding to form a compact and smooth film, which helps improve corrosion inhibition efficiency and plays a certain role in reinforcement.