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Simple hydrogen microprinting method for detecting hydrogen distribution in metal

A simple and metal-based technology, applied in the field of metal corrosion, can solve the problems of high requirements for darkroom conditions and cumbersome operations, and achieve the effects of simple solution formula, easy processing, and cost-saving experimental research

Pending Publication Date: 2021-07-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the dependence on precision instruments and cumbersome operation existing in the existing hydrogen distribution detection technology, as well as the problems that the traditional hydrogen microprinting technology requires high darkroom conditions and requires the use of highly toxic chemicals, the present invention discloses a method for detecting hydrogen distribution in metals. Simple hydrogen microprinting method, the hydrogen microprinting solution used in this method is not sensitive to light, does not use highly toxic chemicals such as cyanide, can be operated under ordinary laboratory conditions, and the obtained characterization results can Clearly show the distribution of H in the metal structure

Method used

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  • Simple hydrogen microprinting method for detecting hydrogen distribution in metal

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Hydrogen microprint detection method for hydrogen distribution in QP980 steel:

[0037] (1) Surface treatment of QP980 steel: Polish the QP980 steel sample with 60#, 320#, 600#, 1000#, 1500#, 2000# and 3000# water-grinding metallographic sandpaper in sequence, and then use the sandpaper with a particle size of 1.5 The diamond polishing paste mechanically polishes the sample until the mirror surface is bright, then washes the sample with water, then cleans the washed sample with alcohol, and blows the sample dry.

[0038] (2) Metallographic erosion: dip in 4% HNO with absorbent cotton ball 3 +C 2 h 6 O (absolute ethanol) solution was used to metallographically corrode the sample for 7 s, and then quickly rinsed with deionized water and alcohol and dried the sample.

[0039] (3) Preparation method of the hydrogen charging solution: Weigh 35g of NaCl solid powder with an electronic balance, pour it into a beaker containing 965ml of deionized water, and stir with a glass r...

Embodiment 2

[0048] Hydrogen microprint detection method of hydrogen distribution in QP980 pre-strained 6.75% steel:

[0049] (1) Surface treatment of QP980 pre-strained 6.75% steel: Grind QP980 pre-strained 6.75% steel samples with 60#, 320#, 600#, 1000#, 1500#, 2000# and 3000# water-grinding metallographic sandpaper Smooth, then mechanically polish the sample with a diamond polishing paste with a particle size of 1.5 until the mirror surface is bright, then wash the sample with water, then clean the washed sample with alcohol, and dry the sample.

[0050] (2) Metallographic erosion: dip in 4% HNO with absorbent cotton ball 3 +C 2 h 6 O (absolute ethanol) solution was used to metallographically corrode the sample for 5 s, and then quickly rinsed with deionized water and alcohol and dried the sample.

[0051] (3) Preparation method of the hydrogen charging solution: Weigh 35g of NaCl solid powder with an electronic balance, pour it into a beaker containing 965ml of deionized water, and ...

Embodiment 3

[0060] Hydrogen microprint detection method for hydrogen distribution in QP1180 steel:

[0061] (1) Surface treatment of QP1180 steel: Polish the QP1180 steel sample with 60#, 320#, 600#, 1000#, 1500#, 2000# and 3000# water-grinding metallographic sandpaper in sequence, and then use sandpaper with a particle size of 1.5 The diamond polishing paste mechanically polishes the sample until the mirror surface is bright, then washes the sample with water, then cleans the washed sample with alcohol, and blows the sample dry.

[0062] (2) Metallographic erosion: dip in 4% HNO with absorbent cotton ball 3 +C 2 h 6 O (absolute ethanol) solution was used to metallographically corrode the sample for 15 s, after which the sample was quickly rinsed with deionized water and alcohol and dried.

[0063] (3) Preparation method of the hydrogen charging solution: Weigh 35g of NaCl solid powder with an electronic balance, pour it into a beaker containing 965ml of deionized water, and stir with ...

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Abstract

The invention discloses a simple hydrogen microprinting method for detecting hydrogen distribution in metal, and belongs to the technical field of metal corrosion. The method comprises the steps: putting a metal sample into a soluble nitrite solution of silver bromide prepared in advance, standing and reacting under a dark and lightproof condition, curing by using a formaldehyde solution, cleaning, and observing the distribution characteristics of silver particles in the sample by using a scanning electron microscope so as to indirectly characterize the distribution state of hydrogen in the sample. According to the principle, hydrogen atoms and silver ions are subjected to an oxidation-reduction reaction, silver particle precipitates are generated in an area where more hydrogen is originally distributed, and the distribution position of the hydrogen in the sample can be indirectly represented by observing the distribution position of the silver particles. According to the method, the distribution of hydrogen in the sample can be researched without the help of expensive professional equipment such as APT, SKPFM and SIMS, the experimental research cost is greatly saved, and a new thought is provided for hydrogen distribution characterization.

Description

technical field [0001] The invention belongs to the technical field of metal corrosion, specifically relates to the field of characterization of hydrogen distribution, in particular to a simple method for detecting hydrogen distribution in metal materials based on hydrogen microprinting technology. Background technique [0002] The diffusion and distribution of hydrogen (H) in the microstructure is the key factor for hydrogen embrittlement in materials, so understand how H interacts with the microstructure at the atomic scale, such as the relationship between the position distribution of H in the material and the microstructure, and Measurement of H concentration, especially local H concentration, is key to understanding the nature of hydrogen embrittlement. [0003] At present, the widely used hydrogen distribution detection technologies include three-dimensional atom probe (Atom Probe Tomography, APT), scanning Kelvin probe force microscopy (Scanning Kelvin Probe Force Mic...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/32G01N1/34G01Q30/20G01Q30/02
CPCG01N1/28G01N1/32G01N1/34G01Q30/20G01Q30/02
Inventor 李金许李维国王菲
Owner UNIV OF SCI & TECH BEIJING
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