Metallographical corrosive liquid and preparation method thereof and 2205 duplex stainless steel metallographical display method

A technology of duplex stainless steel and display method, which is applied in the preparation of test samples, etc., can solve the problems of inability to clearly display austenite and ferrite grains, and achieve a simple and rapid configuration method, clear grain boundaries, and easy effect of operation

Inactive Publication Date: 2014-07-16
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually, the metallographic etchant of 2205 duplex stainless steel is made of ferric chloride, hydrochloric acid, and water according to a certain percentage ratio, or hydrochloric acid, nitric acid, and water are prepared according to a certain volume percentage. Although the above metallographic etchant can reach For the purpose of showing metallographic structure, such as figure 1 Corrosion structure shown, but cannot clearly show austenite and ferrite grains

Method used

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  • Metallographical corrosive liquid and preparation method thereof and 2205 duplex stainless steel metallographical display method
  • Metallographical corrosive liquid and preparation method thereof and 2205 duplex stainless steel metallographical display method
  • Metallographical corrosive liquid and preparation method thereof and 2205 duplex stainless steel metallographical display method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 1 gram of potassium metabisulfite in 50 ml (60°C) hot water first, then add 10 ml of hydrochloric acid with a mass fraction of 36%, and keep stirring with a glass rod to prepare a corrosion solution.

[0021] Operate the No.1 plate of 2205 duplex stainless steel according to the above display method, in which the height of the corrosive solution submerged in the absorbent cotton is 3 mm, and the corrosion time is 20 minutes. Metallographic structure diagram as figure 2 shown.

Embodiment 2

[0023] Dissolve 2 grams of potassium metabisulfite in 50 ml (50°C) hot water first, then add 20 ml of hydrochloric acid with a mass fraction of 36% and keep stirring with a glass rod to prepare a corrosion solution.

[0024] The 2205 duplex stainless steel slab sample is operated according to the above-mentioned display method, in which the height of the corrosive solution submerged in the absorbent cotton is 5 mm, and the corrosion time is 10 minutes. Metallographic structure diagram as image 3 shown.

[0025] From the two examples, it can be seen that the austenite and ferrite grains in the metallographic microstructure of the sample are black and white, the display effect is good, and the surface is free from pollution, which shows that the corrosion effect of the corrosive solution on 2205 duplex stainless steel is excellent.

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Abstract

The invention discloses a metallographical corrosive liquid and a preparation method thereof and a 2205 duplex stainless steel metallographical display method. The metallographical corrosive liquid is composed of potassium metabisulfite, hydrochloric acid and distilled water. The preparation method comprises the following steps: dissolving potassium metabisulfite with distilled water at the temperature of 50-60 DEG C, then adding hydrochloric acid and uniformly stirring, so that the metallographical corrosive liquid is prepared. The 2205 duplex stainless steel metallographical display method comprises the following steps: polishing, cleaning and drying a 2205 duplex stainless steel sample, so that a sample to be detected is obtained; corroding for 10-20 minutes by adopting the metallographical corrosive liquid until the metallographical surface of the sample turns black, so that a sample for observation is obtained, and observing by adopting a metallographical microscope. Compared with the prior art, the invention has the advantages and characteristics that the corrosive liquid is simple to prepare and pollution-free; the preparation method is simple and rapid, and black ferrite crystal particles and white austenite crystal particle tissue can be observed more obviously.

Description

technical field [0001] The invention relates to a metallographic corrosion solution and a preparation method thereof, and a display method for the metallographic phase of 2205 duplex stainless steel. Background technique [0002] 2205 duplex stainless steel is a typical N, Mo, ultra-low carbon, ferrite + austenite duplex stainless steel. Due to the combination of the advantages of ferritic stainless steel and austenitic stainless steel, it has good mechanical properties and corrosion resistance, and is widely used in ships, petroleum, chemical industry, papermaking and other fields. Due to the different composition and production process, the two-phase ratio of 2205 duplex stainless steel will have certain differences, so it is necessary to observe the metallographic structure of 2205 duplex stainless steel. Usually, the metallographic etchant of 2205 duplex stainless steel is made of ferric chloride, hydrochloric acid, and water according to a certain percentage ratio, or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
Inventor 陈兴润潘吉祥
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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