Experimental Study on Compatibility of Eco-Friendly Insulating Medium C5F10O/CO2 Gas Mixture With Copper and Aluminum

The C₅F₁₀O gas mixture has great application prospects as a potential SF₆ substitute gas. It is necessary to study the compatibility of the C₅F₁₀O gas mixture with copper and aluminum used in the electrical insulation equipment before the engineering application. In this paper, we studied the interaction of C₅F₁₀O/CO₂ with copper and aluminum at various temperatures experimentally. The results show that the compatibility of copper with the C₅F₁₀O/CO₂ gas mixture is obviously inferior to that of aluminum. Considering the temperature rise effect during normal operation of the equipment, it is found that the interaction between C₅F₁₀O/CO₂ gas mixture and copper at 80 °C will lead to slight corrosion on the copper surface. The corrosion degree increased at the higher temperature. SEM shows that massive cubic grains will be formed on the copper surface at 150 °C–250 °C. No corrosion was observed on the aluminum surface at 150 °C ~ 250 °C, which is related to the protective effect of the oxide layer Al₂O₃ on the aluminum. The relevant results reveal the compatibility of the C₅F₁₀O/CO₂ gas mixture with metal materials and provide an important reference for the engineering application of the C₅F₁₀O gas mixture.