厦门大学学报（自然科学版）2001，Vol.40Issue(2)：448-458,11.
空间分辨电化学研究新方法
Novel Electrochemical Techniques with Spatial Resolution and Its Applications in the Investigation of Localized Corrosions
林昌健 1卓向东 1田昭武 1冯祖德 1杜荣归 1程璇 1谭建光 1胡艳玲1
作者信息
摘要
Abstract
The electrochemical inhomogeneities at interface of metal/solution play an important and often controlling role in localized corrosion of metals. The traditional electrochemical techniques involving potential, current density or ac impedance measurements over bulk specimens can only provide average and whole information. It is necessary to develop in situ imaging techniques for further characterizing electrochemical inhomogeneities at the interface of metal/solution of localized corrosion system. The electrochemical techniques with spatial resolution, including scanning single micro electrode, scanning double micro electrodes and scanning micro chemical probes have been reviewed. The effects of electrochemical inhomogeneities on the corrosion behavior, and the mechanism for various localized corrosion of metals have been further understood by appropriately using these new electrochemical techniques. An array electrode composed of 64 steel wires and potential imaging system were developed as a new electrochemical technique for probing the corrosion potential distribution at the interface of polymeric coating/metals. The measuring technique was described, and the availability of the technique was examined. The novel data related to the corrosion behaviors at interface of coating/metals and the effects of the defects in the coating on its degradation was obtained and discussed. It was demonstrated by the potential imaging that there always exist inhomogeneities in the coatings, including intrinsic defects or damage in service (artificial defects). Corrosion preferentially initiated at the defect sites. The anodic sites surrounding cathodic area of corrosion reaction and its development process had been in situ imaged for the first time for organic coated steel system. The relevant and direct information provided by this unique technique will be very helpful for further understanding some important physicochemical process associated with degradation of coated metals.关键词
空间分辨/电化学新方法/表面不均一性/局部腐蚀分类
化学化工引用本文复制引用
林昌健,卓向东,田昭武,冯祖德,杜荣归,程璇,谭建光,胡艳玲..空间分辨电化学研究新方法[J].厦门大学学报（自然科学版）,2001,40(2):448-458,11.
