A critical review on electrochemical noise measurement as a tool for evaluation of organic coatings

摘要

Since first introduced to the field of organic coatings about three decades ago,rnelectrochemical noise measurement (ENM) has proved to be a reliable method forrnexamining protective properties of coatings in the laboratory situation. Use has alsornbeen made of the technique in field situations. Simplicity of measuring equipmentrnand versatility of data analysis makes ENM an ideal technique for acquiringrnelectrochemical information about the corrosion behaviour of a painted metal and thernprotection afforded by the organic coating relatively quickly. Special care must berntaken in choosing data acquisition parameters, reference electrodes and symmetryrnof electrodes in order to achieve reproducible measurements. Several areas havernbeen discussed in this review including the methods of data analysis, alternativernelectrodes configurations for on-site measurements and novel applications of therntechnique. Although there is still room for some development work, the view of thernauthors is that this technique has “come of age” in relation to its applicability tornassessment of the level of protection afforded by organically coated metal.