2-Mercaptobenzimidazole films formed at ultra-low pressure on copper: adsorption, thermal stability and corrosion inhibition performance

摘要: Abstract 2-mercaptobenzimidazole (2-MBI) is considered as an effective corrosion inhibitor for copper. In this study, the adsorption of 2-MBI on pristine and pre-oxidized Cu(111) surfaces was investigated by sublimation at ultra low pressure, using Auger Electron Spectroscopy, Scanning Tunneling Microscopy X-ray Photoelectron Spectroscopy in order to understand its inhibition properties. adsorbs with S N atoms bonded Cu. On surface, a self-assembled monolayer formed about 5 L, atomic resulting from molecule decomposition form ( 7 × ) R19.1° structure, that forming (8 × 8) structure. lying flat adsorbed multilayer. Oxidation copper prior exposure results compact homogeneous molecular films, dissociation substitution 2D oxide 2-MBI, but much more slower than 2-mercaptobenzothiazole (2-MBT). A multilayer can block initial stages oxidation under oxygen pressure room temperature, layer stable until 500°C. The comparison 2-MBT suggests latter better temperature.