CO2　has　been　adopted　by　gas　circuit　breakers　serving　as　an　arc　extinguishing　gas　and　by　arc　welding　as　a　shielding　gas.　These　applications　are　usually　accomplished　by　the　erosion　of　metal　constituting　the　device,　which　may　modify　arc　properties.　Therefore,　this　paper　investigates　the　impact　of　metals　(Al,　Fe,　Cu)　on　equilibrium　compositions,　thermodynamic　(mass　density,　specific　enthalpy　and　specific　heat)　and　transport　properties　(thermal　conductivity,　viscosity　and　electrical　conductivity)　for　CO2　thermal　plasmas,　which　are　obtained　using　the　Chapman-Enskog　theory　and　the　Gibbs　free　energy　minimization　method.　Mass　proportion　is　adopted　for　all　mixtures.　The　presence　of　metals,　particularly　Al,　can　greatly　enhance　the　electrical　conductivity　for　CO2,　especially　at　low　temperature　even　for　a　small　concentration　like　1%.　Fe　and　Cu　reveal　quite　close　evolutions　of　electrical　conductivity　and　present　similar　effects　on　electrical　conductivity　of　CO2　under　the　same　mixing　ratio.　However,　for　viscosity　and　thermal　conductivity　of　CO2,　the　attenuating　effects　of　metals,　particularly　Fe　and　Cu,　are　quite　marginal　with　a　concentration　of　10%.