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Etchant for displaying 690 nickel-base alloy deposited metal grain boundary and etching method thereof

A technology for depositing metal and nickel-based alloys, applied in the field of physical and chemical inspection, can solve the problems of incomplete and unclear grain boundaries, and achieve the effects of clear and complete grain boundaries, good corrosion degree and good application prospects.

Active Publication Date: 2019-10-29
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention also provides an etching method for displaying the grain boundaries of 690 nickel-based alloy deposited metals, which solves the problem of incomplete and unclear display of grain boundaries in existing etching methods

Method used

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  • Etchant for displaying 690 nickel-base alloy deposited metal grain boundary and etching method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Sample preparation:

[0023] Sampling at the welding deposited metal of 690 nickel-based alloy, the sampling direction is perpendicular to the welding direction, taking the cross-section of the deposited metal of 690 nickel-based alloy as the analysis surface, and using 200#, 400#, 600#, 800#, 1000 for the section in sequence #Metallographic sandpaper is ground and polished step by step, and the grinding direction needs to be rotated 90° every time the sandpaper is replaced until the surface is bright without scratches to obtain the sample.

[0024] 2) Reagent preparation:

[0025] Add 8g of ferric chloride to 100mL of deionized water, then add 40mL of concentrated hydrochloric acid with a mass fraction of 36-38%, and finally add 3g of EDTA and mix evenly to prepare a corrosive agent; add 3mL of concentrated nitric acid with a mass fraction of 65-68% into 97mL of absolute ethanol to prepare a nitrate ethanol solution with a mass fraction of 3%.

[0026] 3) Etching ...

Embodiment 2

[0029] 1) Sample preparation:

[0030] Sampling at the welding deposited metal of 690 nickel-based alloy, the sampling direction is perpendicular to the welding direction, taking the cross-section of the deposited metal of 690 nickel-based alloy as the analysis surface, and using 200#, 400#, 600#, 800#, 1000 for the section in sequence #Metallographic sandpaper is ground and polished step by step, and the grinding direction needs to be rotated 90° every time the sandpaper is replaced until the surface is bright without scratches to obtain the sample.

[0031] 2) Reagent preparation:

[0032] Add 10g of ferric chloride to 100mL of deionized water, then add 48mL of concentrated hydrochloric acid with a mass fraction of 36-38%, and finally add 1.2g of EDTA and mix evenly to prepare a corrosive agent; add 4mL of concentrated nitric acid with a mass fraction of 65-68% Add it into 96mL of absolute ethanol to prepare a nitric acid ethanol solution with a mass fraction of 4%.

[003...

Embodiment 3

[0036] 1) Sample preparation:

[0037] Sampling at the welding deposited metal of 690 nickel-based alloy, the sampling direction is perpendicular to the welding direction, taking the cross-section of the deposited metal of 690 nickel-based alloy as the analysis surface, and using 200#, 400#, 600#, 800#, 1000 for the section in sequence #Metallographic sandpaper is ground and polished step by step, and the grinding direction needs to be rotated 90° every time the sandpaper is replaced until the surface is bright without scratches to obtain the sample.

[0038] 2) Reagent preparation:

[0039] Add 8g of ferric chloride to 120mL of deionized water, then add 60mL of concentrated hydrochloric acid with a mass fraction of 36-38%, and finally add 2.5g of EDTA and mix evenly to prepare a corrosive agent; add 3mL of concentrated nitric acid with a mass fraction of 65-68% Add it into 97mL of absolute ethanol to prepare a 3% nitric acid ethanol solution.

[0040] 3) Etching treatment: ...

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Abstract

The invention discloses an etchant for displaying a 690 nickel-base alloy deposited metal grain boundary and an etching method thereof. The etchant comprises ferric chloride, EDTA, deionized water andconcentrated hydrochloric acid. The surface of the 690 nickel-based alloy deposited metal surface is successively wiped with the etchant and a nitric acid ethanol solution. Thus, it is possible to intuitively observe that the surface of a sample changes from bright to frosty during an etching process, and the weld bead can be clearly observed by naked eyes in order to better control the degree ofcorrosion, completely and clearly show the grain boundaries of the deposited metal sample grains, and avoid the covering by corrosion products. The etched different grains have different shades due to different orientations. The columnar crystal structure can be clearly observed and the grain boundaries are clear and complete. The etchant is made of simple raw materials, nontoxic, environmentallyfriendly, convenient in liquid waste disposal, low in cost, and stable and easy to control in a reaction process. The etching method is simple and easy to use, and provides detection basis for the process quality control, the process plan and the quality analysis of nuclear welding deposited layer, and has very important practical significance.

Description

technical field [0001] The invention relates to the technical field of physical and chemical testing, in particular to a corrosive agent and an etching method for displaying grain boundaries of 690 nickel-based alloy deposited metals. Background technique [0002] Since the mid-20th century, nickel-based alloy materials have been used in the construction of nuclear equipment due to their high-temperature physical properties and high-temperature corrosion resistance. Commonly used on the surfacing metal of the sealing surface of the nuclear reactor pressure vessel. It is a stainless steel based on nickel (usually with a content greater than 50%). Most nickel-based alloys are austenite. 690 nickel-based alloy is a new type of stress corrosion-resistant material developed on the basis of 600 nickel-based alloy. It is widely used in the pressure-bearing structure of the primary circuit of nuclear power plants. However, these structures are often connected by welding, and the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84G01N33/204G01N33/207G01N1/32G01N1/28
CPCG01N21/84G01N33/204G01N33/207G01N1/32G01N1/28G01N2021/8477
Inventor 唐小华罗宏王若蒙刘奇望蒋勇白昶
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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