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The power supply accident caused by the corrosion of metal materials in the substation has become an important issue that affects the safe operation of the power grid. The corrosion of copper T2 was the most serious. The corrosion behaviour of copper T2 in SO 2 - and H 2 S-containing atmospheric environments was investigated using electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDS), and X-ray diffraction (XRD), and the nonequidistant grey GM(1,1) model was established of which the precision and forecast dependability were evaluated. Results indicated that the corrosion rate of copper in the SO 2  environment increased in the early stages of corrosion and then gradually decreased at the later stages. In contrast, the corrosion rate of copper in the H 2 S environment slowly increased in the early stages of corrosion and then sharply increased at the later stages. The corrosion products in the SO 2  environment consisted of cuprite (Cu 2 O) and brochantite [Cu 4 (OH) 6 SO 4 ], whereas the corrosion products in the H 2 S environment were Cu 2 O and chalcocite (Cu 2 S). The mathematical model has good prediction dependability and higher forecast reliability.

Corrosion analysis of copper T2 exposed to polluted atmospheres and study on prediction model