The porous Ni-Cu alloy with different porosity was fabricated through mixed elemental powders reaction synthesis by step sintering in vacuum furnace. The corrosion resistance and corrosion mechanism of the sintered porous Ni-Cu alloy in hydrofluoric acid (HF) were investigated by the immersion test, the potentiodynamic polarization and the electrochemical impedance spectroscopy (EIS) techniques. Results show that the sintered porous Ni-Cu alloy exhibits good corrosion resistance in hydrofluoric acid solution, compared with porous Ni. The corrosion rate of the sintered porous Ni-Cu is dependent upon the concentration of hydrofluoric acid solution, no passive phenomenon is found in potentiodynamic polarization curve in any concentration. Double capacitive loops for the porous Ni-Cu alloy in EIS results show that the corrosion process is controlled by electrochemical reaction. Moreover, the porosity has little influence on the corrosion resistance of the sintered porous Ni-Cu alloy in hydrofluoric acid solution, which is most likely due to the homogenous pore structure and chemical composition of the material, as well as the chemical stability of the bulk alloy itself.