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Alkaline chemical milling machining and polishing method for aluminum alloy

A chemical milling and aluminum alloy technology, applied in the field of aluminum alloy processing, can solve the problems of uncleanness, over-corrosion and ash removal, affecting process quality, etc., and achieves the effects of low cost, over-corrosion prevention, and simple and convenient preparation.

Inactive Publication Date: 2017-12-22
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the purpose of stealth, some aluminum alloy skins on the surface of the fuselage need to prepare various required step structures on the skin by chemical milling. Parts processed by milling
Aluminum alloy chemical milling is generally carried out in alkaline chemical milling fluid. The surface of the chemically processed parts is covered with a layer of corrosion products that are difficult to remove. General polishing methods are likely to cause over-corrosion or unclean dust removal, which affects the quality of later processes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: aluminum alloy alkaline chemical milling and polishing method, its steps are:

[0017] 1) Chemical degreasing: The chemical degreasing liquid is made of the following raw materials in parts by weight: alkaline cleaning agent 4.5, pure water 995, slowly heated to 65 ℃. Soak the aluminum alloy workpiece in chemical degreasing solution for 10 minutes.

[0018] 2) Alkali corrosion: The alkali corrosion solution is made of the following raw materials in parts by weight: 40 parts by weight of sodium hydroxide, 5 parts by weight of sodium sulfide, and 930 parts by weight of pure water. Slowly heat to 50°C, soak the workpiece in step 1) in the alkali corrosion solution for 0.5 min, and wash the workpiece with pure water 2 to 3 times after alkali corrosion.

[0019] 3) Deoxidation treatment: The deoxidation treatment liquid is made of the following raw materials in parts by weight: 150 nitric acid, 40 chromium trioxide, 10 hydrofluoric acid, 5 thiourea, 0.5 Triton...

Embodiment 2

[0026] Embodiment 2: aluminum alloy alkaline chemical milling and polishing method, its steps are:

[0027] 1) Chemical degreasing: chemical degreasing liquid is made of the following raw materials in parts by weight: alkaline cleaning agent 5.0, pure water 995, slowly heated to 65 ℃. Soak the aluminum alloy workpiece in chemical degreasing solution for 15 min.

[0028] 2) Alkali corrosion: Alkali corrosion solution is made of the following raw materials in parts by weight: sodium hydroxide 60, sodium sulfide 10, pure water 930, slowly heated to 60 ℃. Then soak the workpiece in step 1) in the alkali corrosion solution for 1.5 min, and wash the workpiece with pure water for 2 to 3 times after alkali corrosion.

[0029] 3) Deoxidation treatment: The deoxidation treatment solution is made of the following raw materials in parts by weight: nitric acid 200, chromium trioxide 60, hydrofluoric acid 15, thiourea 10, Triton X-10 1.0, pure water 700, and put The workpiece in step 2) i...

Embodiment 3

[0036] Embodiment 3: aluminum alloy alkaline chemical milling and polishing method, its steps are:

[0037] 1) Chemical degreasing: The chemical degreasing liquid is made of the following raw materials in parts by weight: alkaline cleaning agent 4.75, pure water 995, slowly heated to 62.5 ℃. Then soak the aluminum alloy workpiece in chemical degreasing solution for 12.5 min.

[0038] 2) Alkali corrosion: The alkali corrosion solution is made of the following raw materials in parts by weight: sodium hydroxide 50, sodium sulfide 7.5, pure water 930, slowly heated to 58 ℃. Then soak the workpiece in step 1) in the alkali corrosion solution for 1.0 min, and wash the workpiece with pure water for 2 to 3 times after alkali corrosion.

[0039] 3) Deoxidation treatment: The deoxidation treatment solution is made of the following raw materials in parts by weight: 175 parts by weight of nitric acid, 50 parts by weight of chromium trioxide, 12.5 parts of hydrofluoric acid, 7.5 parts of ...

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Abstract

The invention discloses an alkaline chemical milling machining and polishing method for aluminum alloy. The method comprises the steps of chemical degreasing, alkaline corrosion treating, deoxidation treating, protection glue applying, drying, curing, carving, alkaline chemical milling machining, polishing treating, cleaning and drying. According to the method, a bright and smooth surface can be obtained on the surface of 2,000-series aluminum alloy, a protection film capable of effectively preventing over corrosion can be formed on the surface of a substrate after chemical milling machining and polishing treatment is conducted, and the surface is not liable to be oxidized after being cleaned. A polishing solution is easy and convenient to prepare, low in cost, environmentally friendly and capable of preventing over corrosion.

Description

technical field [0001] The invention relates to aluminum alloy processing technology, in particular to an alkaline chemical milling and polishing method suitable for 2000 series aluminum alloys. Background technique [0002] Pure aluminum has low density, low melting point, high plasticity, easy processing, and strong corrosion resistance, but its strength is very low, so it is not suitable for structural materials. Therefore, pure aluminum can be strengthened by adding a certain amount of alloying elements and heat treatment methods to obtain a series of aluminum alloys. The obtained aluminum alloys have excellent properties such as light weight, high specific strength, and plasticity and become ideal structural materials. They are widely used in automobiles, electronics and Aviation and other industries, such as aircraft fuselage, skin, compressor, etc., aluminum alloy is also one of the main structural materials of various artificial earth satellites and space probes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/04C23F1/36C23F3/02
CPCC23F1/04C23F1/36C23F3/02C23G1/125
Inventor 刘刚彭叔森孟海燕赵晴杜楠
Owner NANCHANG HANGKONG UNIVERSITY
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