High-strength corrosion-resistant cartridge case and preparation method thereof

A corrosion-resistant, high-strength technology, which is applied in the field of high-strength corrosion-resistant bullet casings and their preparation, can solve problems such as not being able to meet military applications, and achieve the effects of improving intergranular corrosion resistance, reducing weight, and increasing strength

Active Publication Date: 2021-06-11
宁波精达五金制造有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent (CN107099705A) discloses a high-strength corrosion-resistant aluminum alloy, which contains the following elements by weight percentage: Zn 1.15-2.31%, Ti0.26-1.38%, Mg 0.26-0.81%, Si 0.26-0.87 %, Cu 0.01~0.05%, Mo 0.008~0.24%, W 0.05~0.18%, N 0.06~0.16%, rare earth elements 0.006~0.028%, the rest are Al and unavoidable impurities, based on the raw material components Aluminum alloys with a tensile strength of 520MPa, a yield strength of 360MPa, and a corrosion rate of 0.116mg / cm2.d were obtained through smelting, modification, and horizontal continuous casting, although it can meet the requirements of most industrial aluminum alloys. Alloy products require strength and corrosion resistance, but they still cannot meet military applications that require extremely high safety and accuracy

Method used

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  • High-strength corrosion-resistant cartridge case and preparation method thereof
  • High-strength corrosion-resistant cartridge case and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh the following raw materials according to mass percentage: Zn: 7.5%, Mg: 2.5%, Cu: 8.0%, Li: 1.2%, Zr: 2.1%, Mn: 1.7%, Sm: 0.7%, and the balance is Al and unavoidable Impurities, and smelting, billet; Extrude the billet at a speed of 8mm / s at 450°C;

[0029] For heat treatment of molded parts, firstly perform primary solution treatment at 420-℃ for 3 hours, then perform secondary solution treatment at 470℃ for 2 hours; then perform primary aging treatment at 140℃ for 20 hours, and finally at 180℃ 24h secondary aging treatment;

[0030] Carry out surface cleaning on the cartridge case, firstly treat it with an aqueous solution composed of sodium hydroxide with a concentration of 7g / L and sodium bicarbonate with a concentration of 13g / L at 55°C for 6 minutes, then wash with water, and then wash it with water at 85°C with a concentration of 320ml / L of H 2 SO 4 (98%) and a concentration of 430ml / L of H 3 PO 4 (85%) mixed solution composed of processing 45s, washe...

Embodiment 2

[0034] Weigh the following raw materials Zn: 5.2%, Mg: 1.5%, Cu: 7.5%, Li: 0.8%, Zr: 1.2%, Mn: 1.5%, Sm: 0.6%, and the balance is Al and unavoidable Impurities, and smelting, billet; Extrude the billet at a speed of 6mm / s at 420°C;

[0035] Heat treatment of molded parts, firstly carry out primary solution treatment at 400°C for 3 hours, then carry out secondary solution treatment at 450°C for 2 hours; then carry out primary aging treatment at 130°C for 24 hours, finally at 170°C Carry out 28h secondary aging treatment;

[0036] Carry out surface cleaning on the cartridge casing, firstly treat it with an aqueous solution composed of sodium hydroxide with a concentration of 6g / L and sodium bicarbonate with a concentration of 12g / L at 50°C for 8 minutes, then wash with water, and then wash it with water at a concentration of 300ml / L at 80°C. L of H 2 SO 4 (98%) and a concentration of 400ml / L of H 3 PO 4 (85%) The mixed solution that forms is processed 50s, washes again;

...

Embodiment 3

[0040] Weigh the following raw materials according to mass percentage: Zn: 8.6%, Mg: 3.2%, Cu: 8.6%, Li: 1.6%, Zr: 2.5%, Mn: 2.3%, Sm: 0.9%, and the balance is Al and unavoidable Impurities, and smelting, billet; Extrude the billet at a speed of 10mm / s at 500°C;

[0041] For heat treatment of molded parts, firstly carry out primary solution treatment at 430°C for 1h, then carry out secondary solution treatment at 490°C for 2h; then carry out primary aging treatment at 150°C for 16h, and finally at 200°C Carry out 18h secondary aging treatment;

[0042] Carry out surface cleaning to the cartridge case, firstly treat it with an aqueous solution composed of sodium hydroxide with a concentration of 8g / L and sodium bicarbonate with a concentration of 15g / L at 60°C for 5 minutes, then wash it with water, and then wash it with water at 90°C with a concentration of 360ml / L L of H 2 SO 4 (98%) and a concentration of 450ml / L of H 3 PO 4 (85%) The mixed solution that forms is proces...

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Abstract

The invention relates to a high-strength corrosion-resistant cartridge case and a preparation method thereof, and belongs to the technical field of alloy material processing. The high-strength corrosion-resistant cartridge case is prepared from the following raw materials including, by mass percent, 5.2%-8.6% of Zn, 1.5%-3.2% of Mg, 7.5%-8.6% of Cu, 0.8%-1.6% of Li, 1.2%-2.5% of Zr, 1.5%-2.3% of Mn, 0.6%-0.9% of Sm and the balance Al and inevitable impurities. On the basis of the raw material components, smelting, blank making, hot extrusion, two-stage solid solution aging heat treatment, surface cleaning, micro-arc oxidation treatment and hole sealing treatment are sequentially carried out, and finally the tensile strength of the cartridge case is not smaller than 872 MPa, and the yield strength of the cartridge case is not smaller than 748 MPa; based on a brine spray test method of the JISZ-2371 standard, the cartridge case is free of the situations of color changing and rusting after being exposed for 720 hours, and is free of the situations of color changing and rusting after being exposed for 2400 hours in a high-temperature and high-humidity atmosphere with the temperature being 50 + / -1 DEG C and the relative humidity being 92% or above; and the color changing time of a drop test is not shorter than 450 min.

Description

technical field [0001] The invention relates to a high-strength corrosion-resistant bullet casing and a preparation method thereof, belonging to the technical field of alloy material processing. Background technique [0002] Lightweight weapons can greatly increase the mobility of troops. As far as various types of bullets are concerned, it is imperative to reduce the weight of bullets without reducing their effectiveness. The weight of the bullet case accounts for almost half of the weight of the bullet. Bear the brunt of it all. The traditional metal shells are mostly copper shells and steel shells, etc., which can no longer meet the requirements of combat and use. Aluminum alloy has the advantages of light weight, high specific strength, easy processing and forming, good corrosion resistance, recyclable reuse, and surface treatment, and is more and more used in the military field. [0003] During the shooting process, the shell case is under the huge pressure of gunpowd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/16C22C21/18C22F1/057C21D9/00C23G1/22C25D11/08C25D11/24C22C21/10C22F1/053
CPCC22C21/16C22C21/18C22F1/057C21D9/0068C23G1/22C25D11/026C25D11/08C25D11/246C22C21/10C22F1/053
Inventor 张建国
Owner 宁波精达五金制造有限公司
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