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Chemical milling solution and chemical milling method thereof

A solution and chemical milling technology, which is applied in the aerospace field, can solve problems such as uneven corrosion, affecting product appearance processing, roughness and orange peel, etc., and achieves the effect of stable solution properties and simple preparation

Active Publication Date: 2015-09-23
TIANJIN AEROSPACE CHANGZHENG ROCKET MFGCO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aluminum alloys used in actual production contain alloying elements that strengthen performance, especially metal elements with relatively positive electrode potentials (such as copper in 2219 materials), which will cause the grains and grain boundaries to form corrosion micro-batteries in the solution, which will Speed ​​up chemical corrosion and form uneven corrosion
Use the traditional chemical milling solution, namely NaOH90~180g / L, Al 3+ 30 ~ 90g / L chemical milling of 2219 aluminum alloy, the surface has more or less rough and orange peel phenomenon (see attached figure 1 ), affecting the appearance and subsequent processing of the product

Method used

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  • Chemical milling solution and chemical milling method thereof
  • Chemical milling solution and chemical milling method thereof
  • Chemical milling solution and chemical milling method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~3

[0022] The bath composition of each embodiment is shown in the following table:

[0023] bath composition

Embodiment 1 formula (g / L)

Embodiment 2 formula (g / L)

Embodiment 3 formula (g / L)

NaOH

120~150

120~150

120~150

Al 3+

30

30

30

potassium sodium tartrate

0

10

10

Sodium thiosulfate

10

10

10

sodium sulfide

15

20

30

[0024] The experimental results are shown in the table below:

[0025]

Embodiment 4

[0027] Chemical milling solution formula: NaOH 120~150g / L, Al 3+ 30g / L, potassium sodium tartrate 10g / L, sodium thiosulfate 10g / L, sodium sulfide 30g / L.

[0028] Adopt above-mentioned formula to carry out two groups of parallel tests, test result is shown in the following table:

[0029]

[0030] The melon petals have no roughness after chemical milling, and the surface is smooth without orange peel. The surface roughness has reached Ra6.3 after comparison.

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Abstract

The invention provides a chemical milling solution and a chemical milling method thereof. The chemical milling solution comprises the following ingredients, NaOH, Al3+, sodium sulphide, sodium thiosulfate, seignette salt and water which serves as a solvent, the solution is adopted to carry out chemical milling treatment on a workpiece, a high-copper-content aluminium alloy can be successfully reduced, particularly the problem that the surface of a 2219 aluminium alloy is rough is solved, after the workpiece is treated by the chemical milling solution, the surface of the workpiece is smooth, the orange peel is not generated, and the surface roughness can meet the requirement; in addition, the preparation of the solution is easy to operate, and the solution property is stable.

Description

technical field [0001] The invention belongs to the technical field of aerospace, and in particular relates to a chemical milling solution and a chemical milling method thereof. Background technique [0002] In the field of aerospace, the chemical milling process (referred to as chemical milling) has a very important position. For parts with complex surface shapes and difficult machining, the process of chemical milling can achieve the processing purpose. In addition, since there is no cutting stress in the chemical milling process, the chemical milling process has a good adaptability to parts that are thinner and easily deformed by machining. [0003] If the purity of the aluminum material is high or the microstructure is uniform, the reaction will proceed slowly and uniformly on the entire surface, and the chemical milling products will have a uniform corrosion rate and ideal surface roughness. However, the aluminum alloys used in actual production contain alloying elemen...

Claims

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Application Information

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IPC IPC(8): C23F1/04C23F1/36
Inventor 刘宝军邹松华张学义姚妍霍岩史楠楠钱明李笑亮孟杰任广贺
Owner TIANJIN AEROSPACE CHANGZHENG ROCKET MFGCO
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