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Method for preparing ceramic film layer with high corrosion resisting and stress corrosion resisting performances

A technology of stress corrosion resistance and ceramic film layer, applied in the direction of surface reaction electrolytic coating, coating, anodizing, etc., can solve the problem of not greatly improving the corrosion resistance and stress corrosion performance of alloys, restricting the application of 7XXX series aluminum alloys, and alloy fractures Failure and other problems, to achieve the effect of improving charge migration resistance, facilitating industrial production and smooth surface

Inactive Publication Date: 2017-12-12
NINGBO RUILONG SURFACE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 7XXX series aluminum alloy is a kind of high-strength aluminum alloy. Its excellent specific strength, processability and weldability make it widely used in aviation and aerospace fields, and in recent years, it has been widely used in the skeleton of automobiles and the shell of electronic products. Among them, the scope of application is constantly expanding, but a large number of corrosion failures often occur
However, when the alloy is in the Cl-environmental medium, the oxide film will be dissolved quickly and corrosion will occur, especially in the service situation with tensile stress, the alloy will even fail suddenly, and the common solid solution of aluminum alloy The treatment and aging treatment process can not greatly improve the corrosion resistance and stress corrosion resistance of the alloy, and its effect is limited in practical applications
These corrosion failure behaviors seriously restrict the application of 7XXX series aluminum alloys.

Method used

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  • Method for preparing ceramic film layer with high corrosion resisting and stress corrosion resisting performances
  • Method for preparing ceramic film layer with high corrosion resisting and stress corrosion resisting performances

Examples

Experimental program
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Effect test

Embodiment 1

[0017] (1) Configure the electrolyte. The concentration of the electrolyte is: sodium hexametaphosphate 25 g / L, potassium hydroxide 2 g / L, sodium tetraborate 6 g / L, EDTA 2 g / L, glycerin 12 g / L ;

[0018] (2) Micro-arc oxidation was performed on the cleaned aluminum alloy surface using a DC pulse micro-arc oxidation device with a current density of 10 A / dm 2 , the temperature was controlled at 20-30°C, and the constant-current micro-arc oxidation time was 15 min under constant stirring.

Embodiment 2

[0020] (1) Configure the electrolyte, the concentration of the electrolyte is: sodium hexametaphosphate 25 g / L, potassium hydroxide 3 g / L, sodium tetraborate 6 g / L, EDTA 2 g / L, glycerol 12 g / L ;

[0021] (2) Micro-arc oxidation was performed on the cleaned aluminum alloy surface using a DC pulse micro-arc oxidation device with a current density of 10 A / dm 2 , the temperature was controlled at 20-30°C, and the constant-current micro-arc oxidation time was 15 min under constant stirring.

Embodiment 3

[0023] (1) Configure the electrolyte, the concentration of the electrolyte is: sodium hexametaphosphate 25 g / L, potassium hydroxide 4 g / L, sodium tetraborate 6 g / L, EDTA 2 g / L, glycerol 12 g / L ;

[0024] (2) Micro-arc oxidation was performed on the cleaned aluminum alloy surface using a DC pulse micro-arc oxidation device with a current density of 10 A / dm 2 , the temperature was controlled at 20-30°C, and the constant-current micro-arc oxidation time was 15 min under constant stirring.

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Abstract

The invention provides a method for preparing a ceramic film layer with high corrosion resistance and stress corrosion resistance. Potassium oxide 1-7 g / L, sodium tetraborate 1-10 g / L, EDTA 1-10 g / L, glycerin 10-20 g / L; Micro-arc oxidation is performed on the surface of high-strength aluminum alloy, the current density is 5‑15 A / dm2, the temperature is controlled at 20‑30 °C, and the constant current micro-arc oxidation time is 10‑30 min under constant stirring. Two kinds of additives, EDTA and glycerin, are added to the electrolyte of the present invention, which greatly improves the compactness of the ceramic film layer, making it difficult for the corrosive medium to anodically dissolve the material matrix through the micro-arc oxidation film layer; greatly improving the charge migration resistance on the surface of the alloy, corrosion and The electrochemical process in the stress corrosion process is inhibited, which significantly improves the corrosion resistance and stress corrosion resistance of the 7XXX series high-strength aluminum alloy surface; the surface of the ceramic film is smooth and has a high bonding force with the substrate.

Description

technical field [0001] The invention relates to a method for preparing a ceramic membrane, in particular to a method for preparing a ceramic membrane with high corrosion resistance and stress corrosion resistance. Background technique [0002] 7XXX series aluminum alloy is a kind of high-strength aluminum alloy. Its excellent specific strength, processability and weldability make it widely used in aviation and aerospace fields, and in recent years, it has been widely used in the skeleton of automobiles and the shell of electronic products. Among them, the range of applications continues to expand, but a large number of corrosion failures often occur. The chemical activity of aluminum is higher than that of steel, and when it is exposed to the air, it will quickly form a very thin oxide film, which will protect the alloy. However, when the alloy is in the Cl-environmental medium, the oxide film will be dissolved quickly and corrosion will occur, especially in the service sit...

Claims

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Application Information

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IPC IPC(8): C25D11/06
CPCC25D11/06C25D11/024
Inventor 宋仁国孙斌宋若希张晓燕曹国平卢俊鹏
Owner NINGBO RUILONG SURFACE TECH CO LTD
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