Metallographic etching methods for high temperature alloy

A high-temperature alloy and metallographic corrosion technology, applied in the field of alloy corrosion, can solve problems such as high concentration and ecological environment pollution, and achieve the effect of reducing pollution, good corrosion effect, and significant production practice significance

Inactive Publication Date: 2019-08-16
TIANJIN SINO GERMAN VOCATIONAL TECHNICAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the process of electrolytic corrosion, it is still necessary to use chemical reagents to prepare a large amount of acidic or alkaline electrolytes. The concentration of these electrolytes is high, which will inevitably cause serious pollution to the ecological environment.

Method used

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  • Metallographic etching methods for high temperature alloy
  • Metallographic etching methods for high temperature alloy
  • Metallographic etching methods for high temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The first step, the preparation of superalloy samples: Use a grinder or wire cutting to cut a cylindrical sample of φ8×15, follow the conventional rough grinding → fine grinding → polishing metallographic treatment process, and place it on the electrolytic polishing corrosion instrument for electrolytic corrosion. In the electrolytic corrosion tank of the platform.

[0053] The second step, electrolyte configuration and addition: Dilute the mixed acid solution of sulfuric acid and phosphoric acid (mass ratio 1:1.2) with distilled water 20 times, and then pour it into the electrolytic corrosion tank.

[0054] The third step, electrolytic corrosion parameter adjustment: adjust the corrosion voltage of the electrolytic polishing corrosion instrument to 3V, and the corrosion time is 15 minutes;

[0055] The fourth step, starting up and corroding: fix the sample, turn on the pump, and then turn on the power switch to corrode the sample;

[0056] Step 5: Remove the sample fo...

Embodiment 2

[0061] The first step, the preparation of superalloy samples: Use a grinder or wire cutting to cut a cylindrical sample of φ15×15, follow the conventional rough grinding → fine grinding → polishing metallographic treatment process, and place it on the electrolytic polishing corrosion instrument for electrolytic corrosion. In the electrolytic corrosion tank of the platform.

[0062] The second step, electrolyte configuration and addition: Dilute the mixed acid solution of sulfuric acid and phosphoric acid (1:1.2 by mass) with distilled water 10 times, and then pour it into the electrolytic corrosion tank.

[0063] The third step, electrolytic corrosion parameter adjustment: adjust the corrosion voltage of the electrolytic polishing corrosion instrument to 5V, and the corrosion time is 1min;

[0064] The fourth step, starting up and corroding: fix the sample, turn on the pump, and then turn on the power switch to corrode the sample;

[0065] Step 5: Remove the sample for cleani...

Embodiment 3

[0070] The first step, the preparation of superalloy samples: use a grinder or wire cutting to cut a cylindrical sample of φ25×15, follow the conventional rough grinding → fine grinding → polishing metallographic treatment process, and place the electrolytic corrosion load on the electrolytic polishing corrosion instrument In the electrolytic corrosion tank of the platform.

[0071] The second step, electrolyte configuration and addition: Dilute the mixed acid solution of sulfuric acid and phosphoric acid (mass ratio 1:1.2) 5 times with distilled water, and then pour it into the electrolytic corrosion tank.

[0072] The third step, electrolytic corrosion parameter adjustment: adjust the corrosion voltage of the electrolytic polishing corrosion instrument to 1V, and the corrosion time is 10 minutes;

[0073] The fourth step, starting up and corroding: fix the sample, turn on the pump, and then turn on the power switch to corrode the sample;

[0074] Step 5: Remove the sample f...

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Abstract

The invention discloses metallographic etching methods for high temperature alloy. A method comprises the steps of 1, for a high temperature alloy test sample which needs to be etched, carrying out rough grinding, fine grinding and polishing in sequence, thereby obtaining a primarily processed high temperature alloy test sample; 2, placing the primarily processed high temperature alloy test sampleinto an electrolytic etching tank on an electrolytic polishing etching device, and pouring water diluted sulfuric acid and phosphoric acid mixed solution into the electrolytic etching tank; and 3, setting the electrolytic polishing etching device according to preset electrolytic etching parameters, starting the electrolytic polishing etching device, etching the primarily processed high temperature alloy test sample placed into the electrolytic etching tank on the electrolytic polishing etching device, and finally obtaining etched high temperature alloy. According to the metallographic etchingmethod for the high temperature alloy disclosed by the invention, a good etching effect for the high temperature alloy can be ensured, pollution of an etching technology to an environment is reduced,and the method is beneficial for popularization and application and has important production and practice significance.

Description

technical field [0001] The invention relates to the technical field of alloy corrosion, in particular to a method for metallographic corrosion of superalloys. Background technique [0002] At present, superalloys are widely used in aerospace and biomedical fields because of their excellent corrosion resistance and wear resistance. The corrosion is clear and the structure is observed, and the electrolytic corrosion method is generally used to corrode it. [0003] However, in the process of electrolytic corrosion, it is still necessary to use chemical reagents to prepare a large amount of acidic or alkaline electrolytes. The concentration of these electrolytes is high, which will inevitably cause serious pollution to the ecological environment. For example, in the existing method, a mixed acid reagent of sulfuric acid (such as a sulfuric acid stock solution with a mass concentration of 98%) and phosphoric acid (such as a phosphoric acid stock solution with a mass concentratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 张慧星孙伟张炜星田春英胡晓丽
Owner TIANJIN SINO GERMAN VOCATIONAL TECHNICAL COLLEGE
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