Technological method for removing plasma spraying NiAl coatings

A process method and plasma technology, applied in the field of ion sprayed NiAl coating, can solve the problems of difficult processing, large stress deformation, low removal efficiency, etc., and achieve the effect of no change in bonding strength

Inactive Publication Date: 2019-02-15
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the disadvantages of difficult processing, large stress deformation, and low removal efficiency by using a single sand blowing method to remove the coating of complex-shaped parts or thin-walled parts. The chemical method can effectively remove the coating, and the insulation protection is convenient. Does not cause corrosion

Method used

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  • Technological method for removing plasma spraying NiAl coatings
  • Technological method for removing plasma spraying NiAl coatings
  • Technological method for removing plasma spraying NiAl coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of NiAl coating removal method for aero-engine is carried out according to the following steps:

[0026] (1) Degreasing and water washing: use organic solvents to degrease, after there is no oil, rinse and dry for insulation protection;

[0027] (2) Insulation protection: Use AC850 glue to insulate and protect the surface of the uncoated part;

[0028] (3) chemical removal: prepare the chemical removal tank solution, add water in the solution, then add nitric acid of the same volume successively, then add 5ml / l additive;

[0029] (4) Clean up surface attachments: Take out the sample every few minutes, remove surface attachments with a brush, and continue to react on the coating surface. stop;

[0030] (5) Repeat process 3;

[0031] (6) Washing to remove insulation: remove surface insulation, then rinse and dry with compressed air.

[0032] After blasting the surface of the sample, the NiAl coating was sprayed again, and the coating was removed again with a ch...

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Abstract

The invention belongs to the field of surface treatment, and particularly relates to a technological method for removing plasma spraying NiAl coatings for GH4169 materials. The plasma spraying NiAl coatings are removed through oil removal and water washing, insulation protection, chemical removal, cleaning of surface attachments, chemical removal and insulator removal through water washing. With the method, the problem of scraping of parts due to the fact that coating of the parts coated with NiAl coatings cannot be removed at present is solved, the manufacturing cost of parts of engines is greatly reduced, the coatings are removed with the chemical method, the service life of the parts is prolonged, meanwhile, compared with the mechanical method for removing the coatings, the method has the advantages that the tool fixture cost is reduced, the production cycle is shortened, and the method has the very high economic value.

Description

technical field [0001] The invention belongs to the field of surface treatment, in particular to a process method for removing a NiAl coating plasma-sprayed on the surface of an engine GH4169 alloy. Background technique [0002] Plasma sprayed NiAl coating is widely used in aero-engines. It is an important bonding coating or functional coating for parts and has important functional significance. The existing coating removal process has many difficulties. If it cannot be effectively removed, it will cause a large number of Parts are scrapped, resulting in huge cost waste. Therefore, the removal and re-spraying process also needs to be consistent. This process may cause many changes in the size of the part and the surface state to the structural performance of the coating. These changes will affect the performance of the aero-engine and even endanger life and national property. Due to the excellent characteristics of this type of coating as the bonding bottom layer, it has ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/44C23F1/02C22C38/06C22C38/04C22C38/50C22C38/48C22C38/44C22C19/03
CPCC22C19/03C22C38/04C22C38/06C22C38/44C22C38/48C22C38/50C23F1/02C23F1/44
Inventor 刘志强李晗晔梁莹张春刚于正洋
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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