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Method for controlling etching speed of aluminum and its alloy

A technology of etching speed and control method, which is applied in the field of etching speed control of aluminum and its alloys, can solve the problems of high disposal cost, short service life of etching solution, high production cost, etc., so as to reduce disposal cost, increase service life and reduce production cost Effect

Inactive Publication Date: 2014-03-26
CHENGDU AIRCRAFT INDUSTRY GROUP
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Problems solved by technology

[0014] (1) When the aluminum ion concentration is greater than 75g / L, the etching speed of aluminum and its alloys is low, which cannot meet the process requirements, and the etching solution is scrapped
[0015] (2) The service life of the etching solution is short and the production cost is high
[0016] (3) The scrapped etchant is a hazardous waste, and the disposal cost is high

Method used

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  • Method for controlling etching speed of aluminum and its alloy

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Embodiment Construction

[0034] The present invention utilizes NaAlO 2 Under the condition of appropriate amount of water, Al(OH) crystallizes out 3 , so that the aluminum ions in the etching solution are controlled within the process range (the concentration of aluminum ions is 35-65g / L), on the one hand, it ensures the stability of the etching speed of aluminum and its alloys, and on the other hand, it prolongs the service life of the etching solution by more than 5 times.

[0035] Below in conjunction with specific embodiment, further illustrate the present invention.

[0036] A method for controlling the etching rate of aluminum and its alloys, characterized in that it comprises the following steps:

[0037] step one,

[0038] Take out about 10% of the total amount of etching solution from the etching tank; the etching tank contains an etching solution volume of 30m 3 -80m 3 , the etching solution includes sodium hydroxide: 140-170g / L, sodium sulfide: 13-18g / L, triethanolamine 38-45g / L, alumin...

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Abstract

In the invention, Al(OH)3 is separated after the crystallization of NaAlO2 in a proper amount of water, so aluminum ions in an etching liquid is controlled in a process range (the concentration of the aluminum ions is 35-65g / L), thereby the stable etching speed of aluminum and its alloy is ensured, and the service life of the etching liquid is prolonged above 5 times.

Description

technical field [0001] The invention patent relates to a method for controlling the etching speed of aluminum and its alloys. Background technique [0002] Etching is an important aluminum alloy processing method widely used in the aerospace industry. [0003] The chemical reaction formula for etching aluminum and its alloys is as follows: [0004] 2Al+2NaOH+2H 2 O→2NaAlO 2 +3H 2 [0005] During the etching process of aluminum and its alloys, aluminum is dissolved in the etching solution as NaAlO 2 exists in the form of N a AlO 2 The production of the etching solution will reduce the efficacy of the etching solution. As the etching progresses, due to the continuous dissolution of the aluminum metal, the NaAlO in the etching solution will 2 The increasing concentration affects the etching rate. [0006] How to Control NaAlO 2 Concentration, to ensure the etching rate has become a difficult problem in the etching process of aluminum and its alloys. [0007] Prior ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/36C23F1/46
Inventor 魏立安周国华尹茂生曹慧兰胡润霞
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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