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Salt mist corrosion resisting aluminum alloy material and application in cartridge case preparation thereof

An aluminum alloy material and salt-spray-resistant technology, applied in the field of bullets, can solve problems such as strength, deformation, high-temperature resistance that cannot meet the requirements, difficulty in achieving large plastic deformation, and ammunition storage threats, so as to reduce stress corrosion and cracking sensitivity , Improve physical and chemical properties, improve the effect of room temperature and high temperature mechanical properties

Active Publication Date: 2019-01-15
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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.

Method used

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  • Salt mist corrosion resisting aluminum alloy material and application in cartridge case preparation thereof
  • Salt mist corrosion resisting aluminum alloy material and application in cartridge case preparation thereof

Examples

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preparation example Construction

[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 ammunition, in particular to a salt mist corrosion resisting aluminum alloy material and application in cartridge case preparation thereof. The salt mist corrosion resisting aluminum alloy material is prepared from the raw materials in percentage by weight: 4.0-7.0% of zinc, 1.0-2.0% of copper, 0.3-0.7% of manganese, 1.0-2.0% of magnesium, 0.01-0.05%of rare earth, 0-0.05% of titanium, 0-0.05% of chromium, and the balance aluminum. Cartridge cases prepared by the material have the obvious advantages of ablation resistance, good moldability and salt mist corrosion resistance, and can bear the chamber pressure of 400 MPa and the transient high temperature of 1000 DEG C. The initial speed of a warhead reaches 1200 m / s. Deformation, cracking andablation of the cartridge cases are effectively avoided. The cartridge cases are particularly suitable for the use of ammunition by soldiers at sea and in areas with high salt mist. Compared with steel cartridge cases, the overall weight is reduced by more than 20%, parameters reach the military use standard, the copper and steel cartridge cases currently in use can be successfully replaced, weight of light weapons can be reduced, ammunition salt mist corrosion resistance is improved, and long-time normal application in the marine environment can be achieved.

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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C21/10C22F1/053B23P15/22
CPCB23P15/22C22C1/026C22C21/10C22F1/053
Inventor 范才河范语楠
Owner HUNAN UNIV OF TECH