A kind of preparation method of high manganese content magnesium manganese master alloy and alloy product

Abstract

The invention discloses a preparation method for a high-manganese-content magnesium-manganese intermediate alloy. The preparation method includes the following steps that A, pretreatment is conducted, specifically, a magnesium ingot, an electrolytic manganese metal piece and a fusing agent are subjected to dewatering treatment, and the manganese metal piece and the fusing agent are mixed and crushed, so that a manganese powder mixture is obtained; B, charging and melting are carried out, specifically, a crucible is heated to be in the dark red color, then a magnesium ingot is placed into the crucible to be heated and melted, after the magnesium ingot is completely melted, the manganese powder mixture is slowly added, adding, stirring and heating are conducted simultaneously, and after the manganese powder mixture is added, stirring is conducted at the constant temperature to enable manganese powder not to be settled to the crucible bottom; C, alloying is carried out, specifically, the temperature is slowly increased, stirring is accelerated, the manganese powder is completely melted, and magnesium melt and manganese melt are alloyed; D, pouring is conducted, specifically, the magnesium melt and the manganese melt are quickly poured into a water-cooling mold and quickly solidified, and the magnesium-manganese intermediate alloy is obtained; and E, packaging and warehousing are carried out. The invention further discloses the magnesium-manganese intermediate alloy with the manganese content being 13-16% by weight, the manganese content is greatly increased, adding of the manganese element in the magnesium alloy smelting process is facilitated, and obtaining of a high-quality magnesium alloy material is facilitated.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a preparation method of a magnesium-manganese master alloy and a magnesium-manganese master alloy product obtained by the method. Background technique [0002] In the production technology of magnesium alloys, manganese is used to remove iron and other metal elements in magnesium melts, avoiding the formation of harmful intergranular compounds to improve the seawater corrosion resistance of Mg-Al aluminum alloys and Mg-Al-Zn alloys ability. Although the strengthening effect of manganese on magnesium alloy is very weak, the strength of the alloy is still improved after deformation. Manganese is easy to combine with harmful impurity elements in the magnesium melt, thereby eliminating the harmful influence of iron on corrosion resistance and making the corrosion rate faster. In particular, the corrosion rate in seawater is greatly reduced, and manganese can also play a ro...

AI Technical Summary

Problems solved by technology

During the addition process, if the addition amount is too small, it is easy to oxidize and burn, and if too much is added at one time, because manganese has to absorb a large amount of heat before melting, and the magnesium melt cannot meet the melting conditions of metal manganese in a short time, the manganese at this time Form an irregular mechanical mixture of high manganese and low magnesium with magnesium, which sinks to the bottom of the crucible and cannot be melted

Furthermore, at the normal melting temperature of magnesium alloy, it is impossible to melt manganese powder in a short time, and it is even more impossible to form (Mg) + (α-Mn) solid solution structure. If you want to use the method of adding manganese powder in the magnesium melt To achieve a certain amount of iron removal and a certain amount of manganese in the alloy, unless the melting temperature of the magnesium alloy continues to be increased, the increase in the melting temperature will inevitably increase the burning loss of the magnesium melt, and the gas absorption in the melt will increase sharply, making the magnesium melt Oxidation inclusions increase, and the total iron content of the melt increases accordingly

The increase of smelting temperature will prolong the smelting time of the alloy, which will have a certain impact on the product quality, the production efficiency will decrease accordingly, the service life of the equipment will be shortened, and the safety hazard will increase.

[0006] There is also the method of adding aluminum-manganese master alloy to supplement the manganese element of magnesium alloy. The aluminum-manganese master alloy is smelted at more than 900 degrees Celsius. Aluminum and manganese have formed Al in this state 11 mn 4 When this kind of intermediate alloy is added to the magnesium alloy melt, although the content of manganese element in the alloy reaches the maximum, it cannot play the role of various physical and chemical properties that manganese element should have in the magnesium alloy material, and even more so Can not play the role of reducing iron, especially not suitable for the production of Mg-Mn alloys

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