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Method for solving problem of acid returning permeation of metal cracks subjected to corrosion of corrosives

A corrosive and crack technology, applied in the preparation of test samples, etc., can solve the problems of retention, inconvenient material detection and analysis, and contamination of the surface of the sample.

Inactive Publication Date: 2013-02-13
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there are cracks on the surface of the sample, due to the capillary action of the cracks, the acid etchant is easy to remain in the cracks. During the process of observing the metallographic structure, the etchant will slowly seep out, contaminate the surface of the sample, and seriously affect the quality of the sample. Observation and analysis have brought a lot of inconvenience to the material testing and analysis work

Method used

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  • Method for solving problem of acid returning permeation of metal cracks subjected to corrosion of corrosives
  • Method for solving problem of acid returning permeation of metal cracks subjected to corrosion of corrosives
  • Method for solving problem of acid returning permeation of metal cracks subjected to corrosion of corrosives

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Effect test

Embodiment 1

[0032] 1): The sampling and processing methods of metallographic samples are based on GB13298-1991, and the samples with a working area of ​​10×10mm are cut by water-cooled grinding wheel cutting method, and the samples are inlaid with resin by hot mounting method. Manually polish and polish with 180#, 240#, 600# and 1200# sandpaper respectively;

[0033] 2): First add 3g Na 2 CO 3 Place in a beaker, then add 100mL of distilled water, and stir well. Immediately immerse the metallographic sample that has not been dried after corrosion into this special reagent, and vibrate the sample with an ultrasonic cleaner for 10 minutes (CBL C9860A type ultrasonic cleaner tank size: 300×240×150mm, ultrasonic frequency 40KHz, capacity: 10L, the timing is 10min);

[0034] 3): Take out the metallographic sample and rinse it with clear water, then dry it with a hair dryer after cleaning with alcohol, observe the metallographic structure of the sample with a metallographic microscope, and ob...

Embodiment 2

[0036] 1): The sampling and processing methods of metallographic samples are based on GB13298-1991, and the samples with a working area of ​​10×10mm are cut by water-cooled grinding wheel cutting method, and the samples are inlaid with resin by hot mounting method. Manually polish and polish with 180#, 240#, 600# and 1200# sandpaper respectively;

[0037] 2): first add 10g NaHCO 3 Place in a beaker, then add 100mL of distilled water, and stir well. Immediately immerse the metallographic sample that has not been dried after corrosion into this special reagent, and vibrate the sample for 3 minutes with an ultrasonic cleaner (CBL C9860A type ultrasonic cleaner tank size: 300×240×150mm, ultrasonic frequency 40KHz, capacity: 10L, the timing is 3min);

[0038] 3): Take out the metallographic sample and rinse it with clear water, then dry it with a hair dryer after cleaning with alcohol, observe the metallographic structure of the sample with a metallographic microscope, and obtain...

Embodiment 3

[0040] 1): The sampling and processing methods of metallographic samples are based on GB13298-1991, and the samples with a working area of ​​10×10mm are cut by water-cooled grinding wheel cutting method, and the samples are inlaid with resin by hot mounting method. Manually polish and polish with 180#, 240#, 600# and 1200# sandpaper respectively;

[0041] 2): First add 20g Na 2 CO 3 Place in a beaker, then add 100mL of distilled water, and stir well. Immediately immerse the metallographic sample that has not been dried after corrosion into this special reagent, and vibrate the sample with an ultrasonic cleaner for 2 minutes (CBL C9860A ultrasonic cleaner tank size: 300×240×150mm, ultrasonic frequency 40KHz, capacity: 10L, the timing is 2min);

[0042] 3): Take out the metallographic sample and rinse it with clear water, then dry it with a hair dryer after cleaning with alcohol, observe the metallographic structure of the sample with a metallographic microscope, and obtain t...

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Abstract

The invention discloses a method for solving the problem of acid returning permeation of metal cracks subjected to corrosion of corrosives. The method is characterized by comprising the steps of polishing a metal sample processed into a metallographical sample to meet requirements of corrosion; immersing the polished metallographical sample subjected to the corrosion of the acidic corrosives immediately in a special reagent, and utilizing an ultrasonic vibration meter to perform vibration on the metallographical sample for 2-10 minutes; and taking the metallographical sample out, cleaning the metallographical sample through water for 1-2 minutes, washing the metallographical sample through alcohol, and then drying the metallographical sample through a drier. The method can solve the problem of the acid returning permeation of the metal cracks subjected to corrosion of the corrosives, facilitates material detection and analysis, and is suitable for metal materials such as carbon steel and alloy steel.

Description

technical field [0001] The invention relates to a method for solving the problem of metal cracks returning to acid after being corroded by a corrosive agent, and belongs to the technical field of metal material analysis. Background technique [0002] In the process of metal material research and failure analysis, it is necessary to observe the metallographic structure of the material, and the analysis of the metallographic structure is to use optical microscopes, electron microscopes, scanning electron microscopes and other instruments to study the microstructure of metals and their alloys and at high and low temperatures. Under the action of various external forces, the microstructure changes accordingly, so the analysis of metallographic structure plays an important role in the research of materials. [0003] In order to facilitate the analysis of the metallographic structure, it is necessary to prepare metallographic samples of a certain shape from the metal material. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
Inventor 李强金用强李宝虎卢小莉佟辉王育翔
Owner SHANGHAI BOILER WORKS
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