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Metallographic etchant used for HR-2 antihydrogen steel, and preparation method and corrosion method of metallographic etchant

A metallographic corrosion, HR-2 technology, applied in the field of metallographic etching solution, can solve the problems of inability to corrode grain boundaries, unclear grain boundaries, etc., and achieve slow and stable corrosion reaction, good display effect, and good corrosion effect.

Inactive Publication Date: 2014-12-24
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wipe the surface of the sample with newly prepared concentrated aqua regia, and the surface of the sample turns black quickly. When the corrosion surface structure is observed under a metallographic microscope, the crystal grains appear black, but the grain boundaries are still unclear; If there is no such surface, it is impossible to corrode a complete and clear grain boundary.

Method used

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  • Metallographic etchant used for HR-2 antihydrogen steel, and preparation method and corrosion method of metallographic etchant
  • Metallographic etchant used for HR-2 antihydrogen steel, and preparation method and corrosion method of metallographic etchant
  • Metallographic etchant used for HR-2 antihydrogen steel, and preparation method and corrosion method of metallographic etchant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of metallographic corrosion method of HR-2 hydrogen-resistant steel, concrete operation is:

[0041] Measure 25 ml of distilled water with a graduated cylinder, pour it into a beaker, add 15 ml of hydrochloric acid, and finally add 5 ml of nitric acid, stir gently with a glass rod, and prepare a metallographic corrosion solution.

[0042] Grind the HR-2 hydrogen-resistant steel sample (rough grinding and then fine grinding when grinding, and then use 400#, 600#, 800#, 1000# water-resistant sandpaper to polish), mechanical polishing (10W, 5W grinding), cleaning ( Wash with distilled water and absolute ethanol), blow dry, and make the sample to be corroded; hold an appropriate amount of absorbent cotton with tweezers, dip in the metallographic corrosion solution, take out the absorbent cotton, and gently wipe the surface of the sample for about 8 minutes until the sample surface Silver gray; pour a certain amount of newly prepared metallographic corrosion solution ...

Embodiment 2

[0045]A metallographic corrosion method of stretched HR-2 hydrogen-resistant steel, the specific operations are:

[0046] Measure 25 ml of distilled water with a graduated cylinder, pour it into a beaker, add 15 ml of hydrochloric acid, and finally add 5 ml of nitric acid, stir gently with a glass rod, and prepare a metallographic corrosion solution.

[0047] Grind the HR-2 hydrogen-resistant steel sample with a deformation of 10% (when grinding, first coarsely grind and then finely grind with 400#, 600#, 800#, 1000# water-resistant sandpaper), mechanical polishing (10W, 5W Grinding), cleaning (cleaning with distilled water and absolute ethanol), drying, and making the sample to be corroded; holding an appropriate amount of absorbent cotton with tweezers, dipping in the metallographic corrosion solution configured according to claim 2, taking out the absorbent cotton, and repeatedly gently Wipe the surface of the sample for about 7 minutes until the surface of the sample is si...

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Abstract

The invention discloses a metallographic etchant used for HR-2 antihydrogen steel, and a preparation method and a corrosion method of the metallographic etchant, and belongs to the technical field of the metallographic etchant. The metallographic etchant comprises nitric acid, hydrochloric acid and distilled water at the volume ratio of 1:3:5. The corrosion method comprises the following steps: 1) polishing, burnishing, cleaning and drying an HR-2 antihydrogen steel sample; 2) using a degreasing cotton to dip the newly prepared metallographic etchant, taking the wetted degreasing cotton to repeatedly scrub the surface of the sample to be corroded till the surface is silver gray; 3) immediately soaking the sample processed in the step 2) into the newly prepared metallographic etchant until a bubble which covers the surface of the sample is yellow; 4) taking out the sample, washing and drying to obtain an HR-2 antihydrogen steel metallographic observation sample, and observing the corrosion effect under a metallographic microscope. The metallographic etchant is a regular chemical agent, is simple to prepare and free of pollution, and subboundary, twin-boundary, crystal-boundary and austenite structures and strain-induced martensite are quite obviously observed.

Description

technical field [0001] The invention belongs to the technical field of metallographic corrosion liquid, and in particular relates to a metallographic corrosion liquid and corrosion method for HR-2 hydrogen-resistant steel. Background technique [0002] In the fields of petrochemical, oil and gas, nuclear, aviation, aerospace and other engineering systems, hydrogen embrittlement has always been a major factor causing premature fracture of components and equipment. With the development of aviation, marine, petroleum, nuclear industry, and hydrogen storage, the performance requirements of high-strength hydrogen embrittlement-resistant alloys used in hydrogen-facing environments are getting higher and higher. Hydrogen-resistant alloys refer to metal materials that can resist hydrogen damage or hydrogen embrittlement. They can be used as structural materials under high-pressure hydrogen (10-70MPa) conditions, and can also be used as lining materials for hydrogenation reaction tan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
Inventor 陈雁张永梅尚福林
Owner XI AN JIAOTONG UNIV
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