A series of Mg-9Al-1Zn-xNd (AZ91Nd) was prepared by adding Mg-Nd master alloy into AZ91 under the protection of CO2+SF6. The density and distribution of galvanic corrosion currents of the AZ91Nd magnesium alloys were investigated by galvanic corrosion tests, electrochemical analysis and X-ray photoelectron spectroscopy (XPS). The XPS results indicated that Nd was incorporated into corrosion film in the form of Nd2O3 during the corrosion. The electrochemical analysis indicated that the addition of Nd increased the corrosion potential and impedance. The corrosion tests indicated that Nd could decrease the current density, improve the uniformity of the current distribution. As a result, the local corrosion of AZ91Nd was effectively restrained and the galvanic corrosion resistance was enhanced. The enhancement of the galvanic corrosion resistance was mainly attributed to the increase of corrosion potential and impedance resulting from the incorporation of Nd2O3 in the corrosion film.