Metallographic etching method

A metallographic etching and etching technology, which is applied in the field of physical detection, can solve the problems of large influence of human factors, difficulty in determining the etching time, difficulty in uniform etching of polished mirror surfaces, etc.

Inactive Publication Date: 2017-02-15
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above-mentioned traditional methods are greatly influenced by human factors, the etching ti

Method used

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Embodiment 1

[0026] The metallographic etching method in this implementation is carried out on an alloy ductile iron sample whose metallographic structure is pearlite+ferrite+carbide.

[0027] The etching method of the present invention specifically includes the following steps:

[0028] 1) According to the composition of the metallographic sample to be etched, 4% nitric acid alcohol solution is selected as the etchant. The specific preparation method is as follows: measure 4ml of nitric acid (analytical grade) with a graduated cylinder, and slowly add it to 96ml In a beaker of water and ethanol, stir well, and let it stand for one minute before use.

[0029] 2) Add the etchant prepared in step 1) to the container to prepare a 10mm×10mm×10mm metal sample. The detection surface of the metal sample is ground and polished until the detection surface is mirrored. Then the metal sample is immersed in the etchant, and the etchant must be over the polished mirror surface.

[0030] 3) Put the container i...

Embodiment 2

[0034] The metallographic etching method of this embodiment is performed on a sample of alloy ductile iron whose metallographic structure is pearlite+ferrite+carbide.

[0035] Using traditional etching methods, specifically:

[0036] A 4% nitric acid alcohol solution was used to etch the polished surface of the prepared metallographic sample, and then the etching effect was observed under a metallographic microscope.

[0037] The traditional etching method requires a long etching time to distinguish the carbide morphology, and the time cannot be accurately determined, the etching is uneven, and the effect is poor. The metallographic photos after traditional etching figure 1 Shown.

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Abstract

The invention discloses a metallographic etching method. The method comprises the steps of: 1) preparing a corresponding etching agent according to the composition of a to-be-etched metallographic sample; 2) adding a certain amount of the etching agent into a container, and immersing a to-be-detected polished mirror of the ground metal sample in the etching agent; 3) putting the container into an ultrasonic vibration instrument, adjusting a corresponding frequency, conducting ultrasonic treatment for a certain period of time, and then blow drying the metal sample with a blower; and 4) observing the detection surface of the metal sample through a metallographic microscope and determining the etching effect. The method provided by the invention accelerates the microscopic electrochemical reaction on the polished surface during metallographic etching, enables even etching of the polished surface of a related sample, reduces the interference of human factors, and can accurately determine the etching reaction time so as to achieve an excellent etching effect.

Description

Technical field [0001] The invention relates to the technical field of physical detection, in particular to a metallographic etching method. Background technique [0002] The traditional metallographic etching method in the metallographic laboratory is to use tweezers to hold a cotton ball dipped in different chemical corrosives to wipe the polished surface of the corresponding prepared metal sample over and over again, and manually observe the color change of the polished mirror to judge The depth of the etching degree is matched with the metallographic microscope to observe the effect of the etching. [0003] The etching principle is an electrochemical reaction. Different structures on the polished surface and the same etchant will have different electrochemical reaction speeds, resulting in uneven relief on the polished mirror surface, which can be observed and analyzed under an optical microscope. Microstructure. [0004] The above-mentioned traditional methods have a great inf...

Claims

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Application Information

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IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 高鑫陈风林
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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