Task #3

Understanding the corrosion inhibition of surfaces not uniformly passivated

Work has been conducted on model copper single crystal surfaces in well controlled metallic or pre-oxidized state with deposition of 2-mercaptobenzothiazole organic inhibitor molecules from the vapor under ultra-low pressure. The results obtained so far emphasize the role of the surface oxide in preventing partial dissociation of the adsorbed molecules and promoting the formation of molecular layers more homogeneous at the nanoscale and thus possibly better protective, which is beyond current knowledge brought by previous experimental studies. DFT modelling shows that the adsorbed molecule can bond to both metallic copper atoms and to unsaturated oxygen atoms of copper oxide on partially oxidized copper surfaces. Further work should bring similar new insight on the interaction of copper surfaces with the 2-MBI (2-mercaptobenzimidazole) inhibitor.

Multilayer adsorption of 2-mercaptobenzothiazole (2-MBT) corrosion inhibitor deposited at ultra-low pressure on (111)-oriented Cu single crystalline surfaces as studied by X-ray Photolectron spectroscopy (XPS) and scanning tunneling microscopy (STM). Surface pre-oxidation prevents partial decomposition that yields atomic sulfur on metallic copper, and promotes the formation of multilayers with more homogeneous nanoscale morphology.

Voir aussi dans «Main results»

Task #1 Task #2