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Surface grain corrosion method for IN718C nickel-based superalloy aviation bearing seat

A nickel-based superalloy, IN718C technology, applied in the field of surface grain corrosion of IN718C nickel-based superalloy aviation bearing seat, can solve the problems of difficult to control corrosion effect, reduce product qualification rate, unstable solution composition, etc., to achieve corrosion Controllable process parameters, improved qualification rate and low cost

Pending Publication Date: 2021-06-18
ANHUI YINGLIU HANGYUAN POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional corrosion method first corrodes with hydrochloric acid and ferric chloride (FeCl3 6H2O), and then uses hydrofluoric acid and nitric acid in a 1:1 ratio to bleach until the grains appear. Both hydrofluoric acid and nitric acid are corrosive acids, and hydrogen Fluoric acid is extremely harmful to the human body and unsafe, while nitric acid will decompose and become unstable when exposed to light and heat, which will lead to unstable composition of the solution and make it difficult to control the corrosion effect, thereby reducing the qualified rate of the product

Method used

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  • Surface grain corrosion method for IN718C nickel-based superalloy aviation bearing seat

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Effect test

Embodiment 1

[0025] A method for surface grain corrosion of an IN718C nickel-based high-temperature alloy aviation bearing seat, comprising the steps of:

[0026] 1) Grinding: Grinding the surface of the casting to remove the corrosion-resistant layer of 0.3-0.5 mm, and completely remove the corrosion-resistant layer on the surface after heat treatment;

[0027] 2) Surface treatment: use sandblasting to remove surface pollutants, remove casting surface pollutants, ensure the surface finish of castings, and at the same time cause compressive stress on the surface of castings, and the surface is in an activated state; the specific operation method of sandblasting is: choose 10mm For the nozzle of the sandblasting machine, adjust the pressure to 0.4-0.6Mpa, select 80-120 mesh sand, and spray on the surface of the casting for 5-6 minutes.

[0028] 3) Hot water soaking: Soak the casting in clean hot water with a water temperature of 45-65°C for at least 15 minutes to prepare for enhancing the c...

Embodiment 2

[0036] A method for surface grain corrosion of an IN718C nickel-based high-temperature alloy aviation bearing seat, comprising the steps of:

[0037] 1) Grinding: Grinding the surface of the casting to remove the corrosion-resistant layer of 0.3-0.5 mm, and completely remove the corrosion-resistant layer on the surface after heat treatment;

[0038] 2) Surface treatment: use sandblasting to remove surface pollutants, remove casting surface pollutants, ensure the surface finish of castings, and at the same time cause compressive stress on the surface of castings, and the surface is in an activated state; the specific operation method of sandblasting is: choose 10mm For the nozzle of the sandblasting machine, adjust the pressure to 0.4-0.6Mpa, select 80-120 mesh sand, and spray on the surface of the casting for 5-6 minutes.

[0039] 3) Hot water soaking: Soak the casting in clean hot water with a water temperature of 45-65°C for at least 15 minutes to prepare for enhancing the c...

Embodiment 3

[0047] A method for surface grain corrosion of an IN718C nickel-based high-temperature alloy aviation bearing seat, comprising the steps of:

[0048] 1) Grinding: Grinding the surface of the casting to remove the corrosion-resistant layer of 0.3-0.5 mm, and completely remove the corrosion-resistant layer on the surface after heat treatment;

[0049] 2) Surface treatment: use sandblasting to remove surface pollutants, remove casting surface pollutants, ensure the surface finish of castings, and at the same time cause compressive stress on the surface of castings, and the surface is in an activated state; the specific operation method of sandblasting is: choose 10mm For the nozzle of the sandblasting machine, adjust the pressure to 0.4-0.6Mpa, select 80-120 mesh sand, and spray on the surface of the casting for 5-6 minutes.

[0050] 3) Hot water soaking: Soak the casting in clean hot water with a water temperature of 45-65°C for at least 15 minutes to prepare for enhancing the c...

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Abstract

The invention discloses a surface grain corrosion method of an IN718C nickel-based superalloy aviation bearing seat. The surface grain corrosion method comprises the following steps: polishing the surface of a casting to remove a corrosion layer; removing casting surface pollutants through sand blasting, so that the casting surface is in an activated state; chemically etching the casting soaked in the hot water in a corrosive liquid prepared from copper sulfate pentahydrate, a hydrochloric acid solution and water; swinging and cleaning with cold water until no corrosive liquid is left on the surface; washing with a high-pressure water gun after neutralizing the casting; and performing surface detection after hot water soaking and drying. Compared with an existing hydrochloric acid and ferric trichloride proportional corrosion and hydrofluoric acid and nitric acid bleaching method, the corrosion method using the proportion of copper sulfate, hydrochloric acid and water has the advantages that the operation steps are simplified and safe, the corrosion process parameters are more controllable, the process is stable, surface crystal grains are clearly and uniformly displayed, the production repeatability is good, the cost is low, and the qualified rate of corrosion production is improved.

Description

technical field [0001] The invention relates to the technical field of nickel-based alloy surface treatment, in particular to a surface grain corrosion method of an IN718C nickel-based high-temperature alloy aviation bearing seat. Background technique [0002] IN718C is a precipitation-strengthened nickel-based superalloy with body-centered tetragonal "γ" phase as the main strengthening phase. It has high strength, plasticity, excellent corrosion resistance and good welding performance between -253 ° C and 700 ° C , is a key material commonly used in the aviation field. After the IN718C nickel-based high-temperature alloy aviation bearing seat is solution treated, it is necessary to use the corrosion method to show the grain growth during the solution treatment. The traditional corrosion method first corrodes with hydrochloric acid and ferric chloride (FeCl3 6H2O), and then uses hydrofluoric acid and nitric acid in a 1:1 ratio to bleach until the grains appear. Both hydrofl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
CPCC23F1/28G01N1/32
Inventor 蔡伟杜应流蒲伟施长坤程耀先张远
Owner ANHUI YINGLIU HANGYUAN POWER TECH CO LTD
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