A kind of chemical milling solution and its chemical milling method

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...

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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

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