Common-battery deposition producing method for Mg La Pr Ce intermediate alloy

The present invention belongs to a coelectrodeposition prepartion method of magnesium-lanthanum, praseodymium and cerium intermediate alloy. In the electrolytic furnace said invention uses potassium chloride, magnesium chloride and lanthanum-praseodymium-cerium chloride as electrolyte, its cathodic current density is 10-30 A/ sq.cm, and its temperature is 700-900 deg.C, so that said invention can utilize the coelectrodeposition process to prepare the invented magnesium-lanthanum-praseodymium-cerium intermediate alloy.