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Chemical die-releasing liquid for high-temperature alloy and die-releasing treatment method of chemical die-releasing liquid

A high-temperature alloy and demoulding treatment technology, which is applied in the field of chemical demoulding liquid for high-temperature alloys, can solve the problems of damage to the mechanical properties of alloys, large pollution of sandblasting treatment, and difficulty in meeting industrialization development, so as to improve corrosion resistance and fluorescent defects Uniformity, uniform appearance and color effect

Inactive Publication Date: 2020-05-12
DONGGUAN FUXING DETERGENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the treatment of black substances on the surface of high-temperature alloy parts of aero-engines, traditional methods include sandblasting, finishing, and manual treatment, but these are difficult to meet the development requirements of modern aero-engines
The sand blasting treatment is polluting and consumes a lot of energy, and cannot completely and uniformly remove the black layer on the surface of the parts, and the surface residual stress generated by the sand blasting treatment may cause recrystallization of the blade during use and damage the mechanical properties of the alloy.
Finishing, as a processing method to reduce the surface roughness of the workpiece, will also damage the mechanical properties of high-temperature alloy parts, and it is difficult to meet the requirements for the production of modern aero-engines
Using manual treatment of black substances on the surface of superalloy parts is more of a means of laboratory proofing and processing, which is difficult to meet the requirements of industrial development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The chemical release liquid of this embodiment is formed by uniformly mixing the following raw materials in mass percentage, 1% hydrofluoric acid, 5% nitric acid, 25% perchloric sodium, and the rest is water.

[0022] The demoulding process of this embodiment is as follows. Put the prepared chemical demoulding liquid into the pp tank, heat it to 50°C and keep the temperature constant, then soak the superalloy parts in the chemical demoulding liquid for 30 minutes, and the black oxide layer on the surface of the parts will change. Get loose. Take out the parts and wash them with a high-pressure water gun with a pressure of 3MPa and a flow rate of 40L / min to completely remove the surface oxide layer. After the high-temperature alloy parts are stripped, the appearance color is uniform, the surface has no damage, no fluorescent defects, and no impact on mechanical properties. .

Embodiment 2

[0024] The chemical mold release liquid of this embodiment is formed by uniformly mixing the following raw materials in mass percentage, 2% hydrofluoric acid, 6% sulfuric acid, 20% sodium hypochlorite, and the rest is water.

[0025] The demoulding process of this embodiment is as follows. Put the prepared chemical demoulding liquid into the pp tank, heat it to 40°C and keep the temperature constant, then soak the superalloy parts in the chemical demoulding liquid for 50 minutes, and the black oxide layer on the surface of the parts will change. Get loose. Take out the parts and wash them with a high-pressure water gun with a pressure of 5MPa and a flow rate of 60L / min to completely remove the surface oxide layer. After the high-temperature alloy parts are removed from the film, the appearance color is uniform, the surface is not damaged, there is no fluorescent defect, and the mechanical properties are not affected. .

Embodiment 3

[0027] The chemical release solution of this embodiment is formed by uniformly mixing the following raw materials in mass percentage, 1% hydrofluoric acid, 6% nitric acid, 55% cerium ammonium nitrate, and the rest is water.

[0028] The demoulding process of this embodiment is as follows. Put the prepared chemical demoulding liquid into the pp tank, heat it to 30°C and keep the temperature constant, then soak the superalloy parts in the chemical demoulding liquid for 60 minutes, and the black oxide layer on the surface of the parts will change. Get loose. Take out the parts and wash them with a high-pressure water gun with a pressure of 6MPa and a flow rate of 80L / min to completely remove the surface oxide layer. After the high-temperature alloy parts are removed from the film, the appearance color is uniform, the surface is not damaged, there is no fluorescent defect, and the mechanical properties are not affected. .

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Abstract

The invention relates to a chemical die-releasing liquid for a high-temperature alloy and a die-releasing treatment method of the chemical die-releasing liquid. The chemical die-releasing liquid is prepared by uniformly mixing the raw materials in percentage by mass: 1-20% of mixed acid, 5-55% of an oxidant, and the balance of water. The chemical die-releasing liquid for the high-temperature alloyand the die-releasing treatment method of the chemical die-releasing liquid have the beneficial effects that black oxidized substances left after the high-temperature blackening treatment of aeroengine high-temperature alloy parts can be removed by chemical means without damaging the mechanical properties and size of the parts, zero-damage of the surfaces of the parts is achieved, fluorescence defects are not generated, the appearance color is uniform, and meanwhile, a new passivation layer is generated to improve the corrosion resistance of the high-temperature alloy parts; and secondly, compared with traditional sandblasting and finishing processes, the process adopting chemical die-releasing is currently the only domestic treatment process which can meet the requirements of scale production of fourth-generation and fifth-generation engines and the size deviation is less than or equal to 0.02mm.

Description

technical field [0001] The invention relates to the technical field of alloy stripping, in particular to a chemical stripping liquid for high-temperature alloys used for stripping high-temperature alloy parts of aero-engines and a stripping treatment method thereof. Background technique [0002] Superalloys are the key materials for the manufacture of aero-engines, mainly used in the four hot-end parts of aero-engines: combustion chamber, guide chamber, turbine blades and turbine discs, and also used in casings, rings, afterburners and tail nozzles and other components. In modern advanced aero-engines, the amount of high-temperature alloy materials accounts for 40%-60% of the total weight of the engine. After high-temperature blackening treatment of superalloys for aero-engines, a layer of black matter will inevitably be formed on the surface. This layer of black matter not only affects the appearance of superalloy parts, but also affects the corrosion resistance and mechan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/10C23C22/34C23C22/36
CPCC23C22/34C23C22/36C23G1/10
Inventor 余宇翔刘发生
Owner DONGGUAN FUXING DETERGENT TECH