Method for regulating and controlling stability of aluminum alloy by combining surface treatment with subsequent heat treatment

A follow-up heat treatment and surface treatment technology, applied in metal material coating process, liquid chemical plating, coating and other directions, can solve the deterioration of thermal stability of 2A12 aluminum alloy material, the long-term use of navigation inertial instruments, and reduce the accuracy of aircraft and service life, to achieve the effect of good interface bonding, promotion of thermal stability and low cost

Inactive Publication Date: 2019-11-19
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] When the 2A12 aluminum alloy material processed by the prior art is used in navigation inertial instruments and other fields, due to the effects of alternating temperature and thermal stress, the material will undergo obvious changes in the structure and stress state, especially under the action of the alternating temperature field , the surface of the material is easy to soften, and the internal matrix is ​​prone to phase transition, which aggravates the dimensional instability of the material; all of the above will lead to the deterioration of the thermal stability of the 2A12 aluminum alloy material, and even deformation. The error caused by this small deformation , will significantly reduce the accuracy and service life of the aircraft
It has extremely adverse effects on the long-term use of navigation inertial instruments

Method used

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  • Method for regulating and controlling stability of aluminum alloy by combining surface treatment with subsequent heat treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) The cold-rolled 2A12 aluminum alloy was mechanically polished for 1 min, and then cleaned in absolute ethanol solution for 3 min; then, the cleaned 2A12 aluminum alloy was placed in a PdCl 2 In the activation solution composed of hydrochloric acid, ultrasonic activation treatment was performed for 7 minutes, and then placed in absolute ethanol solution for ultrasonic cleaning for 4 minutes.

[0039] (2) Put the cleaned aluminum alloy in the activation solution for ultrasonic activation treatment. The amount of each component contained in each liter of activation solution is: PdCl 2 is 1g / L; hydrochloric acid is 25mL / L, and the mass percent concentration of hydrochloric acid is 20%.

[0040] (3) Place the activated aluminum alloy in the plating solution for ultrasonic electroless plating. The electroless plating requires 0.8L of plating solution per kilogram of 2A12 aluminum alloy. Add 2A12 aluminum alloy to the plating solution. Under the temperature, carry out ult...

Embodiment 2

[0046] (1) The cold-rolled 2A12 aluminum alloy was mechanically polished for 2 minutes, and then cleaned in absolute ethanol solution for 4 minutes; then, the cleaned 2A12 aluminum alloy was placed in a PdCl 2 In the activation solution composed of hydrochloric acid, ultrasonic activation treatment was performed for 10 minutes, and then placed in absolute ethanol solution for ultrasonic cleaning for 5 minutes.

[0047] (2) Put the cleaned aluminum alloy in the activation solution for ultrasonic activation treatment. The amount of each component contained in each liter of activation solution is: PdCl 2 is 1.25g / L; hydrochloric acid is 30mL / L, and the mass percent concentration of hydrochloric acid is 10%.

[0048] (3) Put the activated aluminum alloy in the plating solution for ultrasonic chemical plating. The electroless plating requires 1L of plating solution per kilogram of 2A12 aluminum alloy. Add 2A12 aluminum alloy to the plating solution at a temperature of 80°C. Under,...

Embodiment 3

[0054] (1) The cold-rolled 2A12 aluminum alloy was mechanically polished for 3 minutes, and then cleaned in absolute ethanol solution for 5 minutes; then, the cleaned 2A12 aluminum alloy was placed in a PdCl 2 In the activation solution composed of hydrochloric acid, ultrasonic activation treatment was performed for 5 minutes, and then placed in absolute ethanol solution for ultrasonic cleaning for 3 minutes.

[0055] (2) Put the cleaned aluminum alloy in the activation solution for ultrasonic activation treatment. The amount of each component contained in each liter of activation solution is: PdCl 2 is 1.5g / L; hydrochloric acid is 35mL / L, and the mass percent concentration of hydrochloric acid is 30%.

[0056] (3) Put the activated aluminum alloy in the plating solution for ultrasonic chemical plating. The electroless plating requires 1.2L of plating solution per kilogram of 2A12 aluminum alloy. Add 2A12 aluminum alloy to the plating solution. Under the temperature, carry ou...

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Abstract

The invention provides a method for regulating and controlling stability of an aluminum alloy by combining surface treatment with subsequent heat treatment, and belongs to the technical field of non-ferrous metal processing. According to the method, a cold-rolled state 2A12 aluminum alloy is sequentially subjected to surface pretreatment, ultrasonic electroless plating and subsequent heat treatment to obtain the aluminum alloy with good interfacial bonding performance, the stable structure and the small residual stress. Compared with the prior art, the 2A12 aluminum alloy obtained through themethod can effectively reduce the residual stress of the surface of the aluminum alloy by 50 MPa to 70 MPa, the micro-yield strength of the aluminum alloy is improved by 60 MPa to 80 MPa, and the dimensional change is less than 0.008% after the aluminum alloy is placed at room temperature for more than a half year. The operation process is simple, the cost is low, the good interface bonding performance, the stable structure and the small residual stress of the treated aluminum alloy are achieved, a very positive effect on improving the using accuracy and prolonging the service life of a navigation inertial instrument in China is achieved, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for regulating and controlling the stability of an aluminum alloy by combining surface treatment with subsequent heat treatment, and belongs to the technical field of nonferrous metal processing. Background technique [0002] Because 2A12 aluminum alloy has the advantages of high strength, good plastic toughness, low density and good processing and forming performance, it has been widely used in navigation inertial instruments, structural instruments and fairings of aircraft, launch vehicles and other aerospace vehicles. Especially in the application of navigation inertial instruments, aluminum alloy can effectively reduce the weight of inertial instruments, reduce energy consumption and prolong the service life of products. [0003] At present, 2A12 aluminum alloy is a common material in the field of navigation inertial instruments. Due to the particularity of the application environment of the navigation inertial in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/18C23C18/32
CPCC23C18/1666C23C18/1692C23C18/1806C23C18/1844C23C18/32
Inventor 宋宇峰丁学锋陈宇强刘文辉
Owner HUNAN UNIV OF SCI & TECH
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