Carbon dioxide (CO2) corrosion of pipeline steels and equipment has been considered one of the most severe problems in the oil and gas industry. Carbon steels are commonly used for different purposes, because of its competitive cost. However, carbon steel is not the most corrosion resistant material for many environments. The low corrosion resistance of carbon steel is due to its inability to grow a protective oxide layer on its surface that protects it from the aggressiveness of the surrounding environment. It has been demonstrated that carbon steel can be safely operated in very corrosive service conditions if a corrosion control system is properly designed and implemented. However, when these safety precautions fail the consequences can be catastrophic. As a result, it is necessary to consider employing materials with greater corrosion resistance. In this logic intermetallic materials can be a feasible option. In this study the corrosion behavior of a Ni3Al intermetallic alloy and 1018 carbon steel was investigated. Corrosion performance of both materials was evaluated by electrochemical tests by polarization curves, rest potential measurements, and linear polarization resistance. Corrosion tests were carried out in 3% NaCl-diesel mixture saturated with CO2 in a temperature gap from 30 to 80 °C. Results showed that the Ni3Al has both a nobler behavior and higher corrosion resistance than carbon steel. On the other hand, corrosion rate of carbon steel is limited by mass transfer and in case of the Ni3Al intermetallic alloy, corrosion rate is limited for its passivity.