The dissolution and electrochemical properties of molybdenum carbide were investigated using a number of electrochemical techniques, including general corrosion tests (GCT), linear voltammetry (LV), potential controlled electrolysis (PCE) and Scanning Electrochemical Microscopy (SECM), in basic media (0.5−4 M NaOH and 1 M NaHCO₃/Na₂CO₃, pH 9.1–11.3). It was shown that the Mo₂C corrosion potential (E_corr) shifted towards negative values from -0.39 to -0.96 V/SCE with an increase of the OH^-concentration and did not depend on the CO₃^2-concentration in the electrolyte. LV measurements in carbonate buffer (pH 9.2), evidenced three potential regions: passivation fromE_corrto -0.2 V/SCE, pseudopassivation from -0.25 to 0 V/SCE and anodic dissolution (transpassivation) atE> 0.1 V/SCE. The potentials delimiting the mentioned regions decreased with the increase of the OH^-concentration, becoming undistinguished in 2 M NaOH. The Mo₂C dissolution rate (k_diss) in the transpassive state was estimated using LV data. In 4 M NaOH at -0.1 V/SCE,k_dissreached 430 mg cm^-2h^-1and decreased with the decrease of the OH^-concentration and the electrolysis potential. The Mo₂C dissolution current efficiency varied between 12 and 13 F mol^-1Mo₂C, proving the formation of the intermediate products of a carbon oxidative degradation during PCE. The presence of C₂O₄^2-and non-identified aromatic compounds in the electrolytes after Mo₂C dissolution was ascertained, using capillary zone electrophoresis. Scanning electrochemical microscopy (SECM) confirmed the formation of a pseudopassive film and demonstrated the increase of its thickness with the increase of the applied potential. The effect of the presence of Mo₂C on the irradiated UC fuel dissolution rate and the mechanisms involved are discussed.