Corrosion resistant magnesium alloy material and preparation method thereof

Abstract

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.

Description

technical field [0001] The invention relates to a corrosion-resistant magnesium alloy material and a preparation method thereof, belonging to the technical field of non-ferrous metal alloys and preparation thereof. Background technique [0002] Magnesium alloy material is currently the lightest metal material in engineering applications, with small specific gravity, high specific strength, high specific stiffness, good electrical and thermal conductivity, good shock absorption, good electromagnetic shielding, easy cutting, easy recycling, etc. With these advantages, it is widely used in aviation, aerospace, automobiles, ships, and electronic information products, and has become the most promising metal material in the 21st century. At present, the most widely used ones are AZ91D magnesium alloy used in the foundry industry, and deformed magnesium alloys AZ31, AZ61, AZ80, ZK60 used in profiles and plates. However, the corrosion resistance of existing magnesium alloy material...

AI Technical Summary

Problems solved by technology

However, due to the toxicity of beryllium and the price of calcium, the further application of this magnesium alloy material is limited.

At present, some universities, research institutes and enterprises in China have carried out related research work, and some preliminary progress has been made, but most of them are researched on beryllium, calcium, and rare earth elements. Although the addition of these elements can play a certain anti-corrosion effect , but due to the low content of these elements in the earth, high cost or toxicity, their application fields and scope are limited

Combining these factors, these materials are still in the stage of small batch production, and it is difficult to produce in large quantities. Corrosion-resistant magnesium alloys still need to be further developed.

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