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Metallographic corrosive liquid used for 304L stainless steel and preparation method and corroding method thereof

A metallographic corrosion and stainless steel technology, applied in the preparation of test samples, etc., can solve the problems of unsatisfactory corrosion effect, not obvious grain boundary, and good corrosion effect, so as to adjust and optimize the production process and improve product quality , good corrosion effect

Inactive Publication Date: 2016-05-25
JINCHUAN GROUP LIMITED
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] The metallographic structure of 304L stainless steel is usually corroded by aqua regia, and a mixture of nitric acid and alcohol is also used for corrosion, and electrochemical corrosion is also used. Aqua regia is used for more corrosion, but the effect of aqua regia corrosion on 304L stainless steel depends on the alloy. The processing state, the corrosion effect on the cast and annealed products is good, but the corrosion effect on the cold-worked state is not very ideal, and the grain boundary is not very obvious

Method used

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  • Metallographic corrosive liquid used for 304L stainless steel and preparation method and corroding method thereof
  • Metallographic corrosive liquid used for 304L stainless steel and preparation method and corroding method thereof
  • Metallographic corrosive liquid used for 304L stainless steel and preparation method and corroding method thereof

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preparation example Construction

[0017] A method for preparing a metallographic corrosion solution, firstly put ferric chloride into a beaker, then pour distilled water into the beaker, and finally pour concentrated hydrochloric acid into the beaker, stir evenly to fully dissolve the ferric chloride, and let stand It is configured as a metallographic etching solution for 5 minutes.

[0018] A metallographic corrosion method of 304L stainless steel, the 304L stainless steel sample is subjected to rough grinding, fine grinding, distilled water cleaning, ultrasonic cleaning, alcohol rinsing, and drying to make a sample to be tested; the sample to be tested is poured into the metallographic The corrosive solution submerged the sample to be tested for more than 2mm, corroded for 1 to 5 minutes, took out the sample and rinsed it with distilled water quickly, then rinsed it with alcohol, dried it to obtain a 304L stainless steel sample for metallographic observation, and observed it with a metallographic microscope; ...

Embodiment 1

[0020] First put 4g of ferric chloride into the beaker, then pour 50ml of distilled water into the beaker, and finally pour 20ml of concentrated hydrochloric acid into the beaker. The iron is fully dissolved and left to stand for 5 minutes to configure a metallographic corrosion solution.

[0021] The as-cast 304L stainless steel is operated according to the above corrosion method, and the metallographic structure is as follows: figure 1 shown.

Embodiment 2

[0023] First put 6.5g of ferric chloride into the beaker, then pour 50ml of distilled water into the beaker, and finally pour 10ml of concentrated hydrochloric acid into the beaker. The iron oxide is fully dissolved and left to stand for 5 minutes to configure a metallographic corrosion solution.

[0024] The 304L stainless steel in the cold working state is operated according to the above corrosion method, and the metallographic structure is as follows figure 2 shown.

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Abstract

The invention relates to metallographic corrosive liquid used for 304L stainless steel and a preparation method and a corroding method thereof. The metallographic corrosive liquid is prepared from 4-6.5 g of ferric trichloride, 10-20 ml of concentrated hydrochloric acid and 50 ml of water, wherein concentrated hydrochloric acid is analytically pure, and the mass fraction is 36-38%. The metallographic corrosive liquid is suitable for corroding 304L stainless steel metallographic specimen under different machining states and can corrode 304L stainless steel in a cast state or 304L stainless steel in a hot working state or a cold working state or 304L stainless steel metallographic structures which are subjected to heat treatment.

Description

technical field [0001] The invention relates to a metallographic corrosion solution for 304L stainless steel, a preparation method and an corrosion method thereof. Background technique [0002] The metallographic structure of 304L stainless steel is usually corroded by aqua regia, and a mixture of nitric acid and alcohol is also used for corrosion, and electrochemical corrosion is also used. Aqua regia is used for more corrosion, but the effect of aqua regia corrosion on 304L stainless steel depends on the alloy. In the processed state, the corrosion effect on the cast and annealed products is good, but the corrosion effect on the cold-worked state is not very ideal, and the grain boundary is not very obvious. Contents of the invention [0003] The first purpose of the present invention is to provide a metallographic corrosion solution with simple and reasonable design, good erosion effect, good display effect, and suitable for 304L stainless steel in different processing ...

Claims

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Application Information

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IPC IPC(8): C23F1/28G01N1/32
CPCC23F1/28G01N1/32
Inventor 陈琴张海峰
Owner JINCHUAN GROUP LIMITED
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