Coloring technological method for aluminum alloy shell cases

A process method, aluminum alloy technology, applied in anodic oxidation, electrolytic coating, electrophoretic plating, etc., can solve the problems of single coloring, easy to fall off, light color, etc., and achieve the effect of uniform coloring, not easy to fall off, and deep color

Inactive 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] The technical problem to be solved by the present invention is to provide a coloring process for aluminum alloy shells aimin

Method used

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  • Coloring technological method for aluminum alloy shell cases
  • Coloring technological method for aluminum alloy shell cases

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] S1. Anodizing: put the extruded shell into the anodizing solution, the anodizing solution is prepared according to sulfuric acid 18%, YX-I 0.1%, YX-II 0.1%; direct current anodizing for 10min, the current density is 0.6Adm 2 , to form a 22um thick protective layer on the surface of the shell;

[0038] S2. Coloring and sealing: put the anodized cartridge case obtained in step S1 into a coloring solution with a temperature of 18°C, a pH value of 2, and a voltage of 5V, and electrolyze it for 5 minutes. After washing with water, put it into a nickel salt with a concentration of 3%. The holes were sealed in the solution for 1 min. Wherein, the coloring solution contains 23 g / L of stannous sulfate, 7 g / L of copper sulfate, and 50 g / L of sulfuric acid.

[0039] S3. Electrophoretic painting: put the cartridge casing after the sealing treatment in step S2 into the temperature of 20°C and pH of 7.8, containing 3 parts of water-soluble acrylic transparent varnish, 3 parts of sty...

Embodiment 2

[0042] S1. Anodizing: Put the extruded shell into the anodic oxidation solution, the anodic oxidation solution is prepared by sulfuric acid 20%, YX-I 1%, YX-II 0.5%; direct current anodization for 12min, the current density is 0.8Adm 2 , to form a 28um thick protective layer on the surface of the shell;

[0043] S2. Coloring and sealing: put the anodized cartridge casing obtained in step S1 into a coloring solution with a temperature of 20°C, a pH value of 4, and a voltage of 10V, and electrolyze it for 10 minutes. After washing, put a nickel salt with a concentration of 4%. The holes were sealed in the solution for 2 min. Among them, the coloring solution contains 33 g / L of stannous sulfate, 7 g / L of copper sulfate pentahydrate, and 55 g / L of sulfuric acid.

[0044] S3. Electrophoretic painting: put the cartridge casing after the sealing treatment in step S2 into the temperature of 24° C., pH 8, containing 5 parts of water-soluble acrylic transparent varnish, 4 parts of styr...

Embodiment 3

[0047]S1. Anodizing: Put the extruded cartridge case into an anodic oxidation solution, which is prepared by sulfuric acid 25%, YX-I 1.5%, YX-II 1%; direct current anodic oxidation for 28min, current density is 0.8Adm 2 , to form a 30um thick protective layer on the surface of the shell;

[0048] S2. Coloring and sealing: put the anodized cartridge casing obtained in step S1 into a coloring solution with a temperature of 20°C, a pH value of 4, and a voltage of 10V, and electrolyze it for 10 minutes. After washing with water, put a nickel salt with a concentration of 4%. The holes were sealed in the solution for 3 min. Among them, the coloring liquid contains copper sulfate pentahydrate 43g / L, stannous sulfate 8g / L, sulfuric acid 65g / L.

[0049] S3. Electrophoretic painting: put the cartridge casing after the sealing treatment in step S2 into a temperature of 24°C and a pH of 8, containing 5 parts of water-soluble acrylic transparent varnish, 4 parts of styrene, 3 parts of but...

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Abstract

The invention discloses a coloring technological method for aluminum alloy shell cases. Through anodic oxidation, coloring, hole sealing and elecrophoretic coating, the colored shell cases are finallyobtained. According to the coloring technological method, by reasonably setting the ranges of all technological parameters, the shell cases can be colored with different colors according to the production needs, the technological parameters are suitable for coloring of different colors, and a coloring technology is uniform and stable in quality; the optimum ratio of high-concentration metal saltand an acid solution is utilized in coloring liquid, and thus quick and uniform coloring is achieved; a pH value of a coloring agent is stabilized through a buffering agent, thus the high-concentration metal salt can be in a stable environment and does not generate metal precipitation when an electrochemical reaction occurs on a metal interface, thus metal ions are reduced in micropores of an anodic oxide film, and quick and dark coloring is further promoted.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy bullet casings, and more specifically, relates to a coloring process for aluminum alloy bullet casings. Background technique [0002] Aluminum alloys, especially high-strength and tough aluminum alloys, have been widely used in civil fields such as machinery, building materials, chemicals, and packaging because of their light weight, corrosion resistance, and high specific strength. As a lightweight shell material, aluminum alloy can greatly reduce the weight of the shell and improve the combat effectiveness of individual soldiers. At present, aluminum alloy shell forming technology has become the focus of ammunition lightweight research in various countries. [0003] In order to distinguish its category and use, etc., the surface of the bullet casing is often colored to show the difference. At present, most bullet casings are mainly steel bullet casings. Therefore, the bullet casing color...

Claims

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Application Information

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IPC IPC(8): C25D11/08C25D11/18C25D11/22C25D13/04
CPCC25D11/08C25D11/18C25D11/22C25D13/04
Inventor 范才河范语楠
Owner HUNAN UNIV OF TECH
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