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.
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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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