The invention relates to a
corrosion resistant
magnesium alloy material and a preparation method thereof. The
corrosion resistant
magnesium alloy material comprises the following compositions in percentage by
mass: 0.5-3.5 wt% of Nd, 0.2-1.2 wt% of Y, 1.5-3.5 wt% of Sn, 1.2-3.0 wt % of Sb, and teh balance of
impurity elements, wherein Al in the
impurity elements is less than or equal to 0.02 wt%, Mn in the
impurity elements is less than or equal to 0.05 wt%, Fe in the impurity elements is less than or equal to 0.005 wt%, Si in the impurity elements is less than or equal to 0.05 wt%, Cu is less than or equal to 0.001 wt%, the
mass percent of Ni is less than or equal to 0.001 wt%, and the other impurity element content is less than or equal to 0.05 wt% and the balance of Mg. The preparation method comprises the following steps: pure
magnesium, pure Sn and pure Sb are heated in an industrial line frequency induction
melting furnace to reach the temperature of 720 DEG C plus minus 10 DEG C until being molten through heat preservation, common industrial
argon with the flow rate of 1.0-2.0L / min is introduced to the furnace for protection when the metals in the furnace are heated to reach 400 DEG C, then the molten metals are subjected to heat preservation for 20 min, Mg-Nd intermediate
alloy and Mg-Y intermediate alloy are sequentially added to the furnace, the molten metals are subjected to heat preservation for 10-15 min and are then cast, and after
metal mold
casting,
stress relief annealing treatment is carried out at the temperature of 100-150 DEG C for 10-20 min. The invention has the advantages that: the
corrosion resistance is high, a salt mist experiment that 5% NaCl is adopted, the corrosion time is 72 hours, and the temperature is 25 plus minus 1 DEG C shows that: the corrosion rate of
magnesium alloy is less than 0.1 mg. cm<-2>.h-1.