Efficient environmental-protection aluminum alloy alkali ash removing method

An environmentally friendly, aluminum alloy technology, used in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of reducing the service life of the oxidation tank, easy to pollute the oxidation tank, poor environmental protection, etc., and achieve stable ash removal effect. , The effect of reducing production cost and improving service life

Inactive Publication Date: 2019-08-02
CHINA ZHONGWANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides an efficient and environmentally friendly method for removing soda ash from aluminum alloys in order to solve the problems of low efficiency, poor environmental protection, easy pollution of the oxidation tank, and reduced service life of the oxidation tank in the prior art.

Method used

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  • Efficient environmental-protection aluminum alloy alkali ash removing method

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Embodiment 1

[0027] Taking 2024 aluminum alloy as an example, an efficient and environmentally friendly method for removing soda ash on the surface of 2024 aluminum alloy profiles includes the following steps:

[0028] A. Billet racking: put the aluminum alloy profiles on the racks according to the requirements of anodized material loading to ensure that the aluminum alloy profiles are well conductive;

[0029] B. Sulfuric acid degreasing: immerse the aluminum alloy profile in 180-220g / L sulfuric acid solution for 1-3 minutes and take it out;

[0030] C. Alkaline etching: immerse the aluminum alloy profile after sulfuric acid degreasing in 50-80g / L sodium hydroxide solution for 10-60s, and the immersion temperature is 50-60°C;

[0031] D. Ash removal: place the aluminum alloy profile after alkali etching in an anticorrosion tank with 120-160g / L sulfuric acid solution and immerse for 30-90s. The anticorrosion tank is placed in an ultrasonic vibrator, which is connected with a filter in sequ...

Embodiment 2

[0035] Taking 7015 aluminum alloy as an example, an efficient and environmentally friendly method for removing soda ash on the surface of 7015 aluminum alloy profiles includes the following steps:

[0036] A. Billet racking: put the aluminum alloy profiles on the racks according to the requirements of anodized material loading to ensure that the aluminum alloy profiles are well conductive;

[0037] B. Sulfuric acid degreasing: immerse the aluminum alloy profile in 180-220g / L sulfuric acid solution for 1-3 minutes and take it out;

[0038] C. Alkaline etching: immerse the aluminum alloy profile after sulfuric acid degreasing in 50-80g / L sodium hydroxide solution for 10-60s, and the immersion temperature is 50-60°C;

[0039] D. Ash removal: Place the aluminum alloy profiles after alkali etching in an anti-corrosion tank with 160-220g / L sulfuric acid solution and immerse them for 10-60s. The anti-corrosion tank is placed in an ultrasonic vibrator, which is connected with a filter...

Embodiment 3

[0043] Taking die-casting aluminum parts as an example, an efficient and environmentally friendly method for removing soda ash on the surface of die-casting aluminum parts includes the following steps:

[0044] A. Billet racking: put the aluminum alloy profiles on the racks according to the requirements of anodized material loading to ensure that the aluminum alloy profiles are well conductive;

[0045] B. Sulfuric acid degreasing: immerse the aluminum alloy profile in 180-220g / L sulfuric acid solution for 1-3 minutes and take it out;

[0046] C. Alkaline etching: immerse the aluminum alloy profile after sulfuric acid degreasing in 50-80g / L sodium hydroxide solution for 10-60s, and the immersion temperature is 50-60°C;

[0047] D. Ash removal: place the aluminum alloy profile after alkali etching in an anti-corrosion tank with 160-220g / L sulfuric acid solution and immerse it for 10-120s. The anti-corrosion tank is placed in an ultrasonic vibrator, which is connected with a fil...

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Abstract

The invention belongs to the field of aluminum alloy surface treatment, and relates to an efficient environmental-protection aluminum alloy alkali ash removing method. The method comprises the steps of blank loading, sulfuric acid degreasing, alkali erosion, ash removal, anodic oxidation and hole sealing drying; in the ash removal process, aluminum alloy profiles after the alkali erosion are placed in a corrosion resisting tank with 120-220 g / L of sulfuric acid solution for dipping by 0.1-3 min; the corrosion resisting tank is placed in ultrasonic equipment; environmental-protection sulfuric acid is matched with ultrasonic waves for removing alkali ash after alkali erosion of aluminum alloys, so that the ash removing efficiency is improved; and meanwhile, the sulfuric acid with the same components with an oxidation tank is used for removing the ash to prevent harmful substances from entering the oxidation tank, so that the service life of the oxidation tank is prolonged, the environmental problem is solved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of aluminum alloy surface treatment, and relates to an efficient and environment-friendly method for removing alkali ash on aluminum alloys, in particular to a method for removing alkali ash on the surface of high-silicon alloys such as 2-series aluminum alloys, 7-series aluminum alloys, and die-casting parts after alkali corrosion removal method. Background technique [0002] Aluminum alloy ash removal is also called neutralization or outlighting. The ash generally originates from the alkali washing process of pre-oxidation treatment. The ash is mainly composed of some alloy elements such as manganese, copper, iron, silicon, etc. that are insoluble in alkali washing liquid and their interalloy compounds. Composition, these substances will be deposited on the surface of the aluminum alloy after they are produced, forming a layer of taupe or gray-black hanging ash. Before these ash-hanging workpieces enter the oxidati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/10C25D11/16C25D11/24C23G1/12C23G1/22
CPCC23G1/125C23G1/22C25D11/10C25D11/16C25D11/246
Inventor 任玉宝刘昌明赵怀鹏李丹张弟冯静阳
Owner CHINA ZHONGWANG
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