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Corrosive agent and corrosion method for metallographic structure of GH4220 high-temperature alloy

A GH4220, metallographic technology, applied in the preparation of test samples, etc., can solve the problems of toxic substances, safety risks, inability to clearly and completely display the metallographic structure of GH4220 superalloy, and ensure the uniformity of the structure. , the effect of improving quality and improving operability

Pending Publication Date: 2021-12-31
BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a GH4220 superalloy metallographic structure etchant and corrosion method, which can solve one of the following technical problems: (1) the existing etchant and corrosion method cannot clearly and completely display the GH4220 superalloy (2) Some of the existing corrosive agents contain toxic substances, which pose a safety risk

Method used

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  • Corrosive agent and corrosion method for metallographic structure of GH4220 high-temperature alloy
  • Corrosive agent and corrosion method for metallographic structure of GH4220 high-temperature alloy
  • Corrosive agent and corrosion method for metallographic structure of GH4220 high-temperature alloy

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preparation example Construction

[0050] Specifically, the preparation method of the above-mentioned GH4220 superalloy metallographic structure corrosion agent comprises the following steps:

[0051] Step 1, add concentrated hydrochloric acid into the beaker according to the proportion;

[0052] Step 2, add concentrated nitric acid in the beaker according to the ratio;

[0053] Step 3, according to proportioning, glacial acetic acid is added in the beaker;

[0054] Step 4, add glycerin into the beaker according to the ratio;

[0055] Step 5, stirring evenly and then standing still to obtain a GH4220 superalloy metallographic structure etchant.

[0056] It is worth noting that in the above step 4, the time for standing still is controlled to be 3-5 minutes (for example, 3 minutes, 3.5 minutes, 4 minutes, 4.5 minutes, 5 minutes).

[0057] The present invention also provides a method for corroding the metallographic structure of a GH4220 superalloy, comprising the following steps:

[0058] S1. Longitudinal cu...

Embodiment 1

[0078] This embodiment provides a GH4220 superalloy metallographic structure etchant. The components of the etchant are 40ml concentrated hydrochloric acid + 30ml concentrated nitric acid + 10ml glycerin + 20ml glacial acetic acid.

[0079] Preparation method of corrosive agent:

[0080] Step 1, add 40ml concentrated hydrochloric acid into the beaker;

[0081] Step 2, sequentially add 30ml of concentrated nitric acid, 20ml of glacial acetic acid and 10ml of glycerin into the beaker;

[0082] Step 3. Stir and melt with a glass rod and let it stand for 4 minutes evenly to obtain a GH4220 superalloy metallographic structure etchant.

Embodiment 2

[0084] This embodiment provides a GH4220 superalloy metallographic structure etchant. The components of the etchant are 35ml concentrated hydrochloric acid + 30ml concentrated nitric acid + 10ml glycerin + 18ml glacial acetic acid.

[0085] The preparation method of the etchant is the same as that of Example 1, and will not be repeated here.

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Abstract

The invention discloses a corrosive agent and a corrosion method for a metallographic structure of a GH4220 high-temperature alloy, and belongs to the technical field of metallographic analysis of metal materials. The problem that the metallographic structure of the GH4220 high-temperature alloy cannot be clearly displayed by an existing corrosive agent and an existing corrosion method are solved. The metallographic structure corrosive agent comprises concentrated hydrochloric acid, concentrated nitric acid, glycerol and glacial acetic acid. The ratio of the components is as follows: 35-45 ml of concentrated hydrochloric acid, 25-35 ml of concentrated nitric acid, 8-12 ml of glycerol and 17-23 ml of glacial acetic acid. By adopting the corrosive agent and the corrosion method, the metallographic structure of the GH4220 high-temperature alloy can be quickly and clearly corroded.

Description

technical field [0001] The invention belongs to the technical field of metallographic analysis of metal materials, and in particular relates to a GH4220 superalloy metallographic structure etchant and a corrosion method. Background technique [0002] The development of aerospace technology has put forward higher requirements for the performance of the engine, and the technical level of the aerospace engine is an important symbol to measure the level of a country's technological level and industrial strength. The performance of the engine depends mainly on the properties of the materials used. Commonly used materials in engine materials include GH4220 superalloy. GH4220 is a Ni-Co-Cr-based precipitation-hardening deformable superalloy with a service temperature of 900°C to 950°C. More aluminum and titanium elements are added to the GH4220 alloy to form γ' precipitation Strengthening phase, ω (γ') can reach more than 40%. At the same time, cobalt, chromium, tungsten and moly...

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 王帅尹西岳李婷顾晓春
Owner BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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