| Summary: | The C<sub>5</sub>F<sub>10</sub>O gas mixture has great application prospects as a potential SF<sub>6</sub> substitute gas. It is necessary to study the compatibility of the C<sub>5</sub>F<sub>10</sub>O gas mixture with copper and aluminum used in the electrical insulation equipment before the engineering application. In this paper, we studied the interaction of C<sub>5</sub>F<sub>10</sub>O/CO<sub>2</sub> with copper and aluminum at various temperatures experimentally. The results show that the compatibility of copper with the C<sub>5</sub>F<sub>10</sub>O/CO<sub>2</sub> 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 C<sub>5</sub>F<sub>10</sub>O/CO<sub>2</sub> 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 Al<sub>2</sub>O<sub>3</sub> on the aluminum. The relevant results reveal the compatibility of the C<sub>5</sub>F<sub>10</sub>O/CO<sub>2</sub> gas mixture with metal materials and provide an important reference for the engineering application of the C<sub>5</sub>F<sub>10</sub>O gas mixture.
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