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Macroscopic examination method for surface defects of iron-based high-temperature alloy disc

An iron-based superalloy and macro inspection technology, applied in the field of surface treatment, can solve the problems of strong corrosion of the base material of parts, poor corrosion resistance of iron-based superalloy, easy occurrence of local corrosion pits, etc., and meet the requirements of low environmental and production conditions. , the effect of prolonging the service life and improving the qualification rate of one operation

Active Publication Date: 2018-05-04
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the macro-corrosion process introduced by the traditional process method and related materials has the following disadvantages: the macro-corrosion bath liquid is highly corrosive to the base material of the part, the removal margin is large, and the iron-based superalloy is not corrosion-resistant, and localized corrosion is prone to occur during processing pits, uneven surface corrosion layer, some formulas are not easy to achieve mass production of parts, difficult to control processing parameters, and cause great pollution to the environment. It is impossible to obtain a clear and effective macroscopic corrosion layer for inspection under the simplest conditions. Defect processing purpose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for macroscopically inspecting surface defects of iron-based superalloy discs, the specific steps are as follows:

[0024] Step 1: Prepare macro corrosion bath

[0025] Prepare macro corrosion bath solution according to the following requirements: hydrochloric acid: HCl (ρ=1.19) 900g / L; sulfuric acid: H 2 SO 4 (ρ=1.84) 65g / L; copper sulfate: CuSO 4 ·5H 2 O 145g / L; iron filings: 3g / L.

[0026] The specific preparation method is as follows: pour the pulverized copper sulfate and hydrochloric acid into a clean corrosion tank in turn and keep stirring, then slowly add sulfuric acid along the tank wall and continue stirring until the copper sulfate is completely dissolved. After the solution is cooled, iron filings are added, and the solution needs to stand for 24 hours after stirring until it is redissolved.

[0027] Step Two: Clean the Parts

[0028] Mix evenly with 25% calcium hydroxide and 75% magnesium oxide by mass percentage before use. Use water-moist...

Embodiment 2

[0042] The difference with Example 1 is:

[0043] The formulations of macroscopic corrosion baths are different:

[0044] Hydrochloric acid: HCl (ρ=1.19) 1000g / L; Sulfuric acid: H 2 SO 4 (ρ=1.84)) 70g / L; copper sulfate: CuSO 4 ·5H 2 O155g / L; iron filings: 5g / L.

[0045] Using the above process formula, carry out the macroscopic corrosion inspection process processing according to the method of Example 1, keep it in the bath for 20 minutes, the film layer on the surface of the part is clear and uniform, effectively shows the state of the material structure of the part, and effectively inspects the defect of the part and sends it out as qualified .

Embodiment 3

[0047] The difference with Example 1 is:

[0048] The formulations of macroscopic corrosion baths are different:

[0049] Hydrochloric acid: HCl (ρ=1.19) 1200g / L; Sulfuric acid: H 2 SO 4 (ρ=1.84)75g / L; copper sulfate: CuSO 4 ·5H 2 O165g / L; iron filings: 7g / L.

[0050] Using the above process formula, carry out macroscopic corrosion inspection process processing according to the method of Example 1, keep it in the bath for 10 minutes, the film layer on the surface of the part is clear and uniform, effectively shows the state of the material structure of the part, and effectively inspects the defect of the part and sends it out as qualified .

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PUM

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Abstract

The invention aims at providing a macroscopic examination method for surface defects of an iron-based high-temperature alloy disc. The macroscopic examination method specifically comprises the following steps of (1) preparing of a macroscopic corrosion tank liquid; (2) cleaning of a part; (3) macroscopic corrosion; (4) cleaning; (5) treatment after macroscopic corrosion; (6) cleaning; (7) drying.The macroscopic examination method has the advantages that the process operation is simple, and the equipment requirement is simple; when a workpiece is processed by the macroscopic corrosion procedure, the clear and effective macroscopic corrosion layer can be obtained, and the processing purpose of examining the defects is realized.

Description

technical field [0001] The invention relates to a surface treatment technology, and in particular provides a method for preparing a macroscopic corrosion film layer on the surface of an iron-based superalloy disc. Background technique [0002] In the machining and forming process of iron-based superalloy disk parts, in order to check the metallurgical defects of the materials used in the final disk parts and their machining defects as accurately as possible, it is necessary to add a macro corrosion inspection defect process after semi-finishing. Macro-corrosion inspection is widely used in the processing and forming of metal parts as the most intuitive, comprehensive and easy-to-execute process. [0003] However, the macro-corrosion process introduced by the traditional process method and related materials has the following disadvantages: the macro-corrosion bath liquid is highly corrosive to the base material of the part, the removal margin is large, and the iron-based supe...

Claims

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Application Information

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IPC IPC(8): G01N1/32C23F1/28
CPCC23F1/28G01N1/32
Inventor 郭春光王辉杨树林赵贵全孙畅
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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