The Metal Aeruginous Corrosion Inhibitor Spectroelectrochemical And Quantitative Structure-activity Relationship Study

Along with enhanced awareness of environmental protection and sustainable development, there will be new demands on the development and application of corrosion inhibitor. Among them environment-friendly corrosion inhibitors should be the desired ones due to the consideration and need for the purpose of sustainable development our society in the future.On base of this, in this paper, we do research as follows on environmentally friendly copper corrosion inhibitor:As environmentally friendly corrosion inhibitors, amino acids have been studied here. We use electrochemical AC impedance technology to study copper corrosion in 0.6MNaCl solution with various amino acids. The results show that the amino acids showed excellent corrosion performance, in which cysteine inhibition efficiency up to 63.93%. The calculation results show that the corrosion inhibition efficiency is related with molecular structure.Histidine is a typical one of basic amino acids. We discuss the corrosion inhibition of histidine on copper electrode using electrochemical methods in solution of sodium chloride and sodium nitrate. The study focused on the impact of electrode modification time to the electrode/solution interface structue. The results show that the inhibitor L-histidine for copper electrode in the medium NaNO3 /NaCl alleviate some corrosion effects. when copper electrode immersed in solution between 0.5h to 4.5h, the longer the time of immersed the copper electrode surface more of the inhibitor molecule, the more dense membrane corrosion.Nucleic acid bases adenine, as an important component of the nucleic acid is also a good green inhibitor. We use molecular self-assembly technology to prepare adenine molecular SAMs. In this research , surface enhanced Raman scattering(SERS)technique is used to obtain the information about conformation and structure changes of adenine molecules adsorbed on copper surface when solution pH was changed.The results obtained here reveal that with increasing of protonation degree of adenine molecules as a result of lowering in solution pH ,the adsorotion configurations of adenine molecules on copper will transfer from its originally vertical adsorption configuration at high pH to a flat adsorption configuration at low pH . This change was characterized by the relative intensity variation of a characteristic band,which is corresponding to the totally symmetrical ring breathing vibration of adenine molecules,with solution pH.