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A kind of aluminum alloy material resistant to salt spray corrosion and its application in the preparation of bullet casings
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An aluminum alloy material, salt spray resistance technology, applied in the field of bullets, can solve the problems of strength, deformation, high temperature resistance, difficult to achieve large plastic deformation, paint stripping corrosion of ammunition, etc., to reduce stress corrosion and cracking sensitivity. properties, improve physical and chemical properties, and improve the effect of strength and toughness
Active Publication Date: 2021-04-13
HUNAN UNIV OF TECH
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[0005] However, when the existing aluminum alloy materials are used to prepare bullet casings, they have poor extrudability and low elongation, and it is difficult to achieve large plastic deformation. The requirements for strength, deformation, and high temperature resistance cannot meet the requirements, and the aluminum alloy surface has a Layer Al 2 o 3 Membrane, it is easy to absorb moisture. In coastal or offshore military systems, the high salt spray environment poses a serious threat to the storage of ammunition, and it is easy to cause paint stripping and corrosion of ammunition.
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[0059] The preparation method of the aluminum alloy material resistant to salt spray corrosion comprises the following steps:
[0060] S1. Add aluminum to the smelting device, heat until the aluminum melts, add copper, manganese, titanium, chromium, zirconium, magnesium, smelt, pass in protective gas, and refine;
[0061] S2. Spraying the melted material, heat treatment, and cooling to obtain the aluminum alloy material.
Embodiment 1
[0063] This example provides a method for preparing a high-strength and tough aluminum alloy material. The purity of all raw materials is above 99.9%. The composition content of the aluminum alloy material is shown in Table 1. The specific preparation steps are:
[0064] S1. Add aluminum with a purity of 99.99% to the smelting furnace, heat at 780°C until the aluminum is completely melted, then add copper, manganese, titanium, chromium, zirconium, and magnesium in sequence, smelt for 45 minutes, introduce anhydrous nitrogen, and refine for 25 minutes;
[0065] S2. Spray molding the molten material, heat treatment at 460° C. for 1.5 h, and cool to obtain the aluminum alloy material.
Embodiment 2
[0067] This example provides a method for preparing a high-strength and tough aluminum alloy material. The purity of all raw materials is above 99.9%. The composition content of the aluminum alloy material is shown in Table 1. The specific preparation steps are:
[0068] S1. Add aluminum with a purity of 99.99% to the smelting furnace, heat at 800°C until the aluminum alloy is completely melted, then add copper, manganese, titanium, chromium, zirconium, and magnesium in sequence, smelt for 60 minutes, pass in anhydrous nitrogen, and refine for 20 minutes;
[0069] S2. Spray molding the molten material, heat treatment at 470° C. for 1.0 h, and cool to obtain the aluminum alloy material.
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Abstract
The invention relates to the technical field of bullets, in particular to an aluminum alloy material resistant to salt spray corrosion and its application in preparing bullet casings. The composition of the aluminum alloy material includes zinc 4.0~7.0wt.%, copper 1.0~2.0wt.%, manganese 0.3~0.7wt.%, magnesium 1.0~2.0wt.%, rare earth 0.01~0.05wt.%, titanium 0~0.05wt.%, Chromium 0~0.05wt.% and Aluminum. The bullet casing made of the material in the present invention has the remarkable advantages of ablation resistance, good formability, and salt spray corrosion resistance. It can withstand a chamber pressure of 400 MPa and an instantaneous high temperature of 1000°C. The initial velocity of the bullet reaches 1200m / s, effectively avoiding the Deformation, cracking and ablation phenomena are especially suitable for ammunition used by soldiers in sea and high salt spray areas. Compared with steel shell casings, the overall quality is reduced by more than 20%. All parameters meet the military use standards and can successfully replace the currently used Copper and steel shells reduce the weight of light weapons and enhance the salt spray corrosion resistance of ammunition, which can maintain normal use in marine environments for a long time.
Description
technical field [0001] The invention relates to the technical field of bullets, more specifically, to an aluminum alloy material resistant to salt spray corrosion and its application in preparing bullet casings. Background technique [0002] As an economic and military power, our country has a coastline of 18,000 kilometers. Sea area defense is an important direction for armament construction. Therefore, our country needs a always strong navy. As my country's overseas economic interests continue to grow, safeguarding my country's overseas economic interests has also become an important task for our navy. Escorting the Gulf of Aden, combating piracy, etc., our navy has entered the deep blue. In areas with high salt spray such as coastal areas and seas, the transportation, storage and service of ammunition are affected by environmental factors. In the high salt spray environment, the presence of salt spray liquid as an electrolyte accelerates the formation of electrochemical ...
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