Method for non-destructively removing carbon deposit on surface of blade made of GH2150A material and redundant substances on corrosion layer of blade made of GH2150A material

Abstract

The invention discloses a method for nondestructively removing carbon deposit on the surface of a blade made of a GH2150A material and redundant substances on a corrosion layer. The method comprises the following steps: sequentially carrying out soda boiling treatment, cold water washing and hot water washing on the blade made of the GH2150A material until the carbon deposit on the surface of the blade and the redundant substances are nondestructively removed. Compared with a single-piece machining physical mechanical polishing method, the method can efficiently remove carbon deposition and rust layer redundancy on the surface of the blade made of the GH2150A material in batches, a base body on the surface of the blade is not damaged, the pneumatic appearance precision of the blade is not affected, the technological process is short, operation is convenient, production and machining can be completed only through three solution tanks, the production period is short, and the production cost is low. The process is stable, and the cleaning efficiency and quality can be greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of surface treatment technology, and in particular relates to a method for non-destructive removal of carbon deposits and excess rust layers from the surface of GH2150A blades. Background Technology

[0002] GH2150A is an iron-based high-temperature alloy primarily used in components subjected to loads in high-temperature environments, and is widely used in the manufacture of aero-engine blades. Aero-engine blades are core components that determine engine performance, reliability, and safety, directly affecting thrust, efficiency, lifespan, and overall operational safety; they are considered the "heart valves" of the engine. Compressor blades are responsible for drawing in air from the atmosphere and compressing it stage by stage, converting the kinetic energy of the airflow into pressure energy, providing high-pressure, high-density air to the combustion chamber, a prerequisite for ensuring complete fuel combustion and generating sufficient thrust. Their aerodynamic shape accuracy directly determines compression efficiency; if there is a large amount of carbon buildup on the blade surface, it will lead to a sharp drop in compression efficiency, resulting in insufficient engine thrust. Under high-temperature and high-pressure operating conditions, aero-engine blades are prone to carbon and oil buildup on their surfaces. Currently, the removal of carbon buildup on blade surfaces mainly relies on physical mechanical grinding methods, which can easily affect the blade's shape accuracy. Therefore, there is an urgent need to develop a non-destructive cleaning method for carbon buildup and excess material on blade surfaces, tailored to the blade material type.

[0003] Patent application CN110961405A discloses a method for removing carbon deposits from the afterburner fuel manifold of an aero-engine. Based on the oxidation-reduction action of a high-temperature alkaline solution, it loosens carbon deposits and other contaminants on the surface of the parts through oxidation-reduction, thereby peeling them off from the substrate surface. Simultaneously, carbon deposits inside the afterburner fuel manifold are detached from the pipe wall through vibration, and ultrasonic vibration is used to draw oil away from the inner wall of the afterburner fuel manifold through the fuel inlet nozzle, achieving the purpose of carbon removal. The surface deposits of GH2150A blades are mainly carbon deposits and rust. However, the alkaline solution in this method has a weak effect in penetrating and loosening carbon deposits and rust layers, resulting in poor effectiveness in removing excess material and rust products from the surface of the parts.

[0004] Patent application CN101768748A discloses a solution for chemically removing carbon deposits from high-pressure turbine blades. The method is based on the mixture of 781 chemical cleaning agent and multiple components to obtain a solution for removing carbon deposits. However, this solution is prone to corroding the surface of GH2150A material blades, causing changes in the surface condition and size of the blades, and reducing the mechanical properties of the blades. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a method for non-destructive removal of carbon deposits and excess rust layers on the surface of GH2150A blades.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides a method for non-destructive removal of carbon deposits and rust residues on the surface of GH2150A material blades, comprising the process of sequentially performing alkaline boiling treatment, cold water washing, and hot water washing on the GH2150A material blades to remove carbon deposits and residues from the surface in a non-destructive manner.

[0008] Preferably, the alkaline boiling treatment includes immersing the GH2150A material blades in an alkaline boiling solution at 90-140°C for 1-3 hours.

[0009] Preferably, the total volume of the GH2150A material blades does not exceed 2 / 3 of the volume of the alkaline boiling solution, and compressed air is used for stirring during the alkaline boiling process.

[0010] Preferably, the alkaline boiling solution comprises sodium hydroxide, sodium nitrite, sodium phosphate, and water.

[0011] Preferably, the sodium hydroxide concentration is 600-700 g / L, the sodium nitrite concentration is 150-250 g / L, and the sodium phosphate concentration is 30-120 g / L.

[0012] Preferably, the cold water washing step includes rinsing the GH2150A material leaves in room temperature cold water for 1-2 minutes.

[0013] Preferably, in the cold water washing step, the washing process is accompanied by compressed air agitation.

[0014] Preferably, the hot water washing step includes immersing the GH2150A material blades in hot water at 80-90℃ for 1-2 minutes.

[0015] The beneficial effects of this invention are as follows: Compared to single-piece physical mechanical grinding methods, the method of this invention simultaneously adds sodium phosphate, phosphate ions, and iron ions from rust to the liquid to produce soluble chelates. This allows for efficient batch removal of carbon deposits and excess material from the rust layer surface of GH2150A blades without damaging the blade surface substrate or affecting its aerodynamic shape accuracy. The process is simple, easy to operate, and requires only three solution tanks to complete the production process. The production cycle is short, the process is stable, and it can greatly improve cleaning efficiency and quality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the GH2150A material blade after cleaning in Example 2; Figure 2 This is a schematic diagram of the GH2150A material blade after cleaning in Example 2.

[0017] Figure 3This is a schematic diagram of the GH2150A material blade before cleaning in Example 3; Figure 4 This is a schematic diagram of the GH2150A material blade after cleaning in Example 3; Detailed Implementation

[0018] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0019] Example 1: A method for non-destructive removal of carbon deposits and rust residues from the surface of GH2150A blades includes a process of sequentially performing alkaline boiling treatment, cold water washing, and hot water washing on the GH2150A blades to remove surface carbon deposits and residues non-destructively.

[0020] The alkaline boiling treatment involves immersing the GH2150A material blades in an alkaline boiling solution at 90°C for 1 hour.

[0021] The total volume of the GH2150A material blade does not exceed 2 / 3 of the volume of the alkaline boiling solution, ensuring that the blade is completely submerged and that the alkaline boiling solution can fully act on it. During the alkaline boiling process, compressed air is used for stirring to promote the full saponification reaction on the blade surface and the removal of excess material from the surface.

[0022] The alkaline boiling solution comprises sodium hydroxide, sodium nitrite, sodium phosphate, and water.

[0023] The sodium hydroxide concentration is 600 g / L, the sodium nitrite concentration is 150 g / L, and the sodium phosphate concentration is 30 g / L.

[0024] The cold water washing step includes rinsing the GH2150A material leaves in room temperature cold water for 1 minute.

[0025] In the cold water washing step, compressed air is used to agitate the water during the washing process, which increases the cleanliness of the rinse.

[0026] The hot water washing step includes immersing the GH2150A material blades in hot water at 80℃ for 1 minute.

[0027] After cleaning the GH2150A blades, the carbon deposits, oil stains, and rust layers on the blade surface can be completely removed, and the blade surface shows a good smoothness without any corrosion marks.

[0028] Example 2: A method for non-destructive removal of carbon deposits and rust residues from the surface of GH2150A blades includes a process of sequentially performing alkaline boiling treatment, cold water washing, and hot water washing on the GH2150A blades to remove surface carbon deposits and residues non-destructively.

[0029] The alkaline boiling treatment involves immersing GH2150A material blades in an alkaline boiling solution at 140°C for 3 hours.

[0030] The total volume of the GH2150A material blades does not exceed 2 / 3 of the volume of the alkaline boiling solution. The alkaline boiling process is accompanied by compressed air stirring to promote the full saponification reaction on the blade surface and the removal of excess material.

[0031] The alkaline boiling solution comprises sodium hydroxide, sodium nitrite, sodium phosphate, and water.

[0032] The sodium hydroxide concentration is 700 g / L, the sodium nitrite concentration is 250 g / L, and the sodium phosphate concentration is 80 g / L.

[0033] The cold water washing step includes rinsing the GH2150A material leaves in room temperature cold water for 2 minutes.

[0034] In the cold water washing step, compressed air is used to agitate the water during the washing process, which increases the cleanliness of the rinse.

[0035] The hot water washing step includes immersing the GH2150A material blades in 90℃ hot water for 2 minutes.

[0036] like Figure 1 , 2 As shown, after cleaning the GH2150A blades, the carbon deposits, oil stains, and rust layers on the blade surface can be completely removed, and the blade surface exhibits a good smoothness without any corrosion marks.

[0037] Example 3: A method for non-destructive removal of carbon deposits and rust residues from the surface of GH2150A blades includes a process of sequentially performing alkaline boiling treatment, cold water washing, and hot water washing on the GH2150A blades to remove surface carbon deposits and residues non-destructively.

[0038] The alkaline boiling treatment involves immersing the GH2150A material blades in an alkaline boiling solution at 120°C for 2 hours.

[0039] The total volume of the GH2150A material blades does not exceed 2 / 3 of the volume of the alkaline boiling solution. The alkaline boiling process is accompanied by compressed air stirring to promote the full saponification reaction on the blade surface and the removal of excess material.

[0040] The alkaline boiling solution comprises sodium hydroxide, sodium nitrite, sodium phosphate, and water.

[0041] The sodium hydroxide concentration is 650 g / L, the sodium nitrite concentration is 200 g / L, and the sodium phosphate concentration is 120 g / L.

[0042] The cold water washing step includes rinsing the GH2150A material leaves in room temperature cold water for 1.5 minutes.

[0043] In the cold water washing step, compressed air is used to agitate the water during the washing process, which increases the cleanliness of the rinse.

[0044] The hot water washing step includes immersing the GH2150A material blades in hot water at 85°C for 1.5 minutes.

[0045] After cleaning the GH2150A blades using the method in Example 3, the carbon deposits, oil stains, and rust layers on the blade surface can be completely removed, leaving the blade surface with a good smoothness and no traces of corrosion. The cleaning effect is shown in Example 3. Figure 3 and 4 Before and after comparison.

[0046] In this application, sodium hydroxide is the main cleaning component, which can undergo a saponification reaction with carbon deposits and oil stains on the surface of GH2150A, 1Cr17Ni2, and 1Cr16CoW2MoV blades, indirectly achieving the fluffing of carbon deposits on the blade surface. Simultaneously, sodium phosphate can react with rust products FeO3, FeO, and Fe on the surface of GH2150A blades. 3+ A chemical reaction occurs, forming a soluble chelate, thereby achieving the cleaning effect of removing rust products. Sodium nitrite serves as a surface protective component in the cleaning process, blocking OH radicals. - The reaction with the substrate avoids surface roughness caused by "alkaline corrosion," and the alkaline boiling process also generates a passivation film, providing some rust protection for the blades. This method, using an alkaline boiling bath at 90-130℃ with compressed air agitation, achieves high cleaning efficiency for carbon deposits, oil stains, and excess rust. The process is simple, stable, and suitable for batch processing.

Claims

1. A method for non-destructive removal of carbon deposits and rust layers from the surface of GH2150A blades, characterized in that: The process comprises sequentially performing alkali boiling treatment, cold running water washing and hot water washing on the GH2150A material blade to remove surface carbon and excess substances without damage.

2. The method for non-destructive removal of carbon deposits and rust layers from the surface of GH2150A material blades as described in claim 1, characterized in that: The alkali boiling treatment comprises immersing the GH2150A material blade in an alkali boiling solution at 90-140 DEG C for 1-3 h.

3. The method for non-destructive removal of carbon deposits and rust layers from the surface of GH2150A material blades as described in claim 2, characterized in that: The total volume of the GH2150A material blade is not more than 2 / 3 of the volume of the alkali boiling solution, and compressed air stirring is accompanied during the alkali boiling treatment.

4. The method for non-destructive removal of carbon deposits and rust layers from the surface of GH2150A material blades as described in claim 2, characterized in that: The components of the alkali boiling solution comprise sodium hydroxide, sodium nitrite, sodium phosphate and water.

5. The method for non-destructive removal of carbon deposits and rust layers from the surface of GH2150A material blades as described in claim 4, characterized in that: The sodium hydroxide is 600-700 g / L, the sodium nitrite is 150-250 g / L, and the sodium phosphate is 30-120 g / L.

6. The method of claim 1, wherein the GH2150A material blade surface area carbon and corrosion layer excess material non-destructive removal method is characterized by: The cold running water washing step comprises placing the GH2150A material blade in room temperature cold running water for 1-2 min.

7. The method of claim 6, wherein the GH2150A material blade surface area carbon and corrosion layer excess is non-destructively removed. In the cold running water washing step, compressed air stirring is accompanied during the water washing process.

8. The method of claim 1, wherein the GH2150A material blade surface area carbon and corrosion layer excess material non-destructive removal method is characterized by: The hot water washing step comprises placing the GH2150A material blade in hot water at 80-90 DEG C for 1-2 min.

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