| Copper with good properties such as metal conductivity, is used widely today. But copper is liable to be corroded. Therefore, anticorrosion chemicals for metal protection have been extensively investigated. But current corrosion inhibitors are mainly organic corrosion inhibitor, which always result in certain environmental pollution as to their utilization. In order to reduce such a kind of harm on the environment, research and development of green corrosion inhibitor with high-efficiency, has been an important task for scientists especially for chemists. On the other hand, the present corrosion inhibitors and the relationship between corrosion inhibitor molecular structures and their inhibition performance are also an important task for chemists.SAMs formed on the metal surface from mercapto compounds and their derivatives are currently investigated widely. By using electrochemical and electrochemical in situ SERS technique, the molecular structure and adsorption of 4,4'-dithiodipyridine SAMs formed on copper electrode surface, used as an corrosion inhibition monolayer, were characterized and analyzed. The results of this study reveal that 4,4'-dithiodipyridine SAMs formed on the copper can be used as a good corrosion inhibitor.As environmental friendly corrosion inhibitors, amino acids biodegradable corrosion inhibitors are investigated. We use the EIS techniaque to research corrosion efficiency of L-glutamate SAMs adsorbed on copper surface. The results show that with increasing of the concentration of L-glutamate, the corrosion inhibition efficiency will also increase. Furthermore several amino acids were also investigated for their corrosion inhibition efficiency for copper by such a technique. In addition, based upon quantum chemistry calculation and chemometrics analysis, the quantitative structure-property relationship model was also eastablished for these amino acids. The results reveal that all thses amino acids show different corrosion inhibition efficiencies for copper. QSPR relationship study shows that the corrosion inhibition efficiency of these amino acids is closely related with their molecular structural characteristics. |
