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Method for removing persistent pollutants from surface of K424 tail nozzle part

A technology for pollutants and tail nozzles, which is applied in the field of K424 alloy parts cleaning for aero-engines, can solve the problems of complex structure of parts, inability to remove clean, and the surface state of parts cannot meet the requirements of fluorescent inspection.

Inactive Publication Date: 2018-06-05
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional cleaning process, that is, cleaning agent ultrasonic cleaning or long-term immersion cannot be removed, and most of the parts have complex structures, and there are small parts that cannot be cleaned, resulting in the surface condition of the parts not meeting the requirements of fluorescent inspection, which seriously affects the normal installation progress.

Method used

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  • Method for removing persistent pollutants from surface of K424 tail nozzle part

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Effect test

Embodiment 1

[0036] In the present embodiment, the specific steps of the method for removing stubborn pollutants on the surface of the K424 tail nozzle parts are as follows:

[0037] The aero-engine regulator (K424 alloy tail nozzle parts) is degreased by organic solvent→chemical degreasing→washed in hot water at (60~80)℃→washed in cold water (room temperature), in 600g / L sodium hydroxide+250g / L nitrous acid In sodium aqueous solution, soak at 140°C for 2 hours, take it out → wash with hot water at (60-80)°C → wash with cold water (room temperature) → rinse with high-pressure water (0.4-0.6) MPa (repeatedly rinse), use pH test paper to check the residue on the surface of the part The pH value of the water (pH ≤ 8), and finally the parts are dried by compressed air, and the pollutants on the surface of the parts can be completely removed by naked eyes.

[0038] Such as figure 1 As shown, from the comparison before and after the removal of pollutants on the surface of K424 alloy parts, it c...

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Abstract

The invention belongs to the field of cleaning of K424 alloy parts for aeroengine, and particularly relates to a method for removing persistent pollutants from the surface of a K424 tail nozzle part.The invention aims to provide an effective removal method according to the structural features of K424 alloy parts of engine tail nozzles and the states of the persistent pollutants on the surface, and the method comprises a bath formula, process parameters and a process flow. In order to solve the problems that severe pollutants on the surfaces of the K424 tail nozzle parts cannot be thoroughly cleaned through ultrasound by adopting a traditional cleaning agent and the fluorescence inspection requirements cannot be satisfied in an engine repair process, soaking in an alkaline solution at hightemperature is adopted by the method, so that the persistent pollutants on the surfaces of the parts can be effectively removed, the fluorescence inspection requirements are satisfied, and no influence is generated on K424 base materials.

Description

technical field [0001] The invention belongs to the field of cleaning K424 alloy parts for aero-engines, in particular to a method for removing stubborn pollutants on the surface of K424 tail nozzle parts. Background technique [0002] When the engine is in normal working condition, the high-temperature gas after combustion in the combustion chamber is discharged through the nozzle part for a long time; at the same time, when the engine is turned on afterburner, a large amount of fuel cannot be completely burned, and only about 80% of the fuel will be converted into heat energy. Then it will be discharged in the state of oil mist. Regulators, seals, beams and other parts are located at the outlet of the tail nozzle, and there are pollutants similar to oil stains on the surface; after a long flight, the adhesion between the pollutants and the substrate of the parts is enhanced, so they are very stubborn. The traditional cleaning process, that is, cleaning agent ultrasonic cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/20
CPCC23G1/20
Inventor 梁莹李晗晔刘志强于正洋张春刚
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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