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Electrolytic polishing solution and electrolytic polishing method for preparing nickel-based superalloy needle tip sample

A nickel-based high-temperature alloy and electrolytic polishing technology, which is applied in the field of electrolytic polishing, can solve the problems of difficult preparation of needle tip samples, low quality of needle tip, and low production efficiency, and achieve the effects of simple configuration, improved efficiency, and easy operation

Active Publication Date: 2022-01-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rough polishing electrolyte of nickel-based superalloys currently reported is generally composed of perchloric acid and glacial acetic acid, but during the polishing process, black corrosion products are easily produced on the surface of the sample, and the corrosion products are attached to the sample and are not easy to fall off. It is very difficult, the production efficiency is low, and the quality of the prepared needle tip is not high, and the success rate of the 3DAP experiment is low

Method used

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  • Electrolytic polishing solution and electrolytic polishing method for preparing nickel-based superalloy needle tip sample
  • Electrolytic polishing solution and electrolytic polishing method for preparing nickel-based superalloy needle tip sample
  • Electrolytic polishing solution and electrolytic polishing method for preparing nickel-based superalloy needle tip sample

Examples

Experimental program
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Effect test

Embodiment 1

[0024] In this embodiment, the needle tip sample is prepared by electrolytic polishing method for the nickel-based superalloy GH4169. In the rough polishing electrolyte, by volume percentage, perchloric acid is 8%, and ethylene glycol butyl ether is 92%. In the fine polishing electrolyte, by volume percentage, perchloric acid is 4%, and ethylene glycol butyl ether is 96%.

[0025] The electrolytic polishing solution is used to prepare nickel-based superalloy tip samples, and the specific steps are as follows:

[0026] (1) Prepare the nickel-based superalloy into a filament-shaped sample blank of 0.5mm×0.5mm×15mm by tangential cutting. The sample blank is used as the anode and connected to the positive electrode of the DC power supply; the platinum wire ring is used as the cathode and connected to the DC power supply. The inner diameter of the platinum wire ring is about 3 mm, and the outer diameter of the platinum wire ring is about 3.5 mm; the sample blank is inserted vertic...

Embodiment 2

[0031] In this example, a needle tip sample was prepared by electrolytic polishing method for the nickel-based superalloy GH4169 with Ce added. In the rough polishing electrolyte, by volume percentage, perchloric acid is 15%, and ethylene glycol butyl ether is 85%. In the fine polishing electrolyte, the content of perchloric acid is 2% by volume, and ethylene glycol butyl ether is 98%. Prepare needle-tip samples following the electrolytic polishing procedure in the manual.

[0032] The electrolytic polishing solution is used to prepare nickel-based superalloy tip samples, and the specific steps are as follows:

[0033] (1) Prepare the nickel-based superalloy into a filament-shaped sample blank of 0.5mm×0.5mm×15mm by tangential cutting. The sample blank is used as the anode and connected to the positive electrode of the DC power supply; the platinum wire ring is used as the cathode and connected to the DC power supply. The inner diameter of the platinum wire ring is about 3 m...

Embodiment 3

[0038] In this embodiment, the needle tip sample is prepared by electrolytic polishing method for the nickel-based superalloy K416B. In the rough polishing electrolyte, by volume percentage, perchloric acid is 10%, and ethylene glycol butyl ether is 90%. In the fine polishing electrolyte, the volume percentage content of perchloric acid is 3%, and ethylene glycol butyl ether is 97%. Prepare needle-tip samples following the electrolytic polishing procedure in the manual.

[0039]The electrolytic polishing solution is used to prepare nickel-based superalloy tip samples, and the specific steps are as follows:

[0040] (1) Prepare the nickel-based superalloy into a filament-shaped sample blank of 0.5mm×0.5mm×15mm by tangential cutting. The sample blank is used as the anode and connected to the positive electrode of the DC power supply; the platinum wire ring is used as the cathode and connected to the DC power supply. The inner diameter of the platinum wire ring is about 3 mm, a...

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Abstract

The invention relates to the technical field of electrolytic polishing, in particular to an electrolytic polishing solution and an electrolytic polishing method for preparing a nickel-based superalloy needle tip sample. The electrolytic polishing solution for preparing the nickel-based superalloy needle tip sample is divided into a rough polishing electrolyte and a fine polishing electrolyte, and the rough polishing electrolyte and the fine polishing electrolyte are both composed of perchloric acid and ethylene glycol butyl ether; in the rough polishing electrolyte, the perchloric acid accounts for 8%-15% by volume, and the ethylene glycol butyl ether accounts for 92%-85% by volume; in the fine polishing electrolyte, the perchloric acid accounts for 2%-4% by volume, and the ethylene glycol butyl ether accounts for 98%-96% by volume. The electrolytic polishing method for preparing the nickel-based superalloy needle tip sample comprises the two steps that S1, rough polishing is conducted, specifically, a blank is polished until necking is formed; and S2, fine polishing is conducted, specifically, the necking is broken to form a sharp needle tip. The electrolytic polishing solution for preparing the nickel-based superalloy needle tip sample is simple to prepare, the electrolysis temperature is normal temperature, operation is easy, the polishing effect is remarkable, the efficiency of preparing the nickel-based superalloy needle tip sample is greatly improved, and the success rate of related three-dimensional atom probe experiments is greatly increased.

Description

technical field [0001] The invention relates to the technical field of electrolytic polishing, in particular to an electrolytic polishing solution and an electrolytic polishing method for preparing nickel-based superalloy needle tip samples. Background technique [0002] Three-dimensional atom probe tomography (3DAP) can reveal the spatial distribution information of elements on the atomic scale and can provide three-dimensional analysis maps of materials with atomic-scale resolution. It is an advanced technology for analyzing the three-dimensional spatial distribution and composition characterization of nanoscale precipitates. One of the analytical testing methods with the highest spatial resolution. 3DAP has been used to study the precipitation process of phases at the nanoscale, and to study the composition, size, and number density of nanoclusters or precipitated phases. In the field of superalloys, 3DAP is mostly used to study the evolution behavior of the γ' / γ interfa...

Claims

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Application Information

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IPC IPC(8): C25F3/22G01N1/32
CPCC25F3/22G01N1/32
Inventor 宋元元姜海昌戎利建闫德胜赵明久
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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