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There are many traditional methods for characterizing corrosion, such as the weight measurement method using metal coupons, XRD quantitative analysis, and EDX quantitative analysis. However, due to the relatively mild corrosive environment in which electrical equipment operates, the corrosion product film formed on the metal surface has a thickness in the range of 100–2000 Å, and the weight change of the metal coupons is on the order of 0.001 g. Additionally, the presence of dust attached to the surface of the coupons introduces errors when using the weight measurement method to determine the thickness of the corrosion product film. Furthermore, in a micro-corrosion environment, the corrosion product film is very thin, resulting in weak XRD diffraction intensity and larger errors in the XRD test results. During EDX analysis, the electron beam can easily penetrate the film layer and reach the substrate, which also leads to significant errors. In general, traditional methods for corrosive characterization all have certain limitations. To this end, we have developed high-precision copper characterization test coupons that feature high purity, low oxygen content, and uniform microstructure. In micro-corrosion environments, these coupons enable accurate assessment of the severity of such corrosive conditions; the theoretical testing accuracy for the thickness of the corrosion product film can reach 1A. They allow for the analysis of micro-corrosion environments, and can be used to characterize the actual micro-corrosion conditions under which electrical equipment operates.