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A Method for Rapidly Eliminating Hydrogen in Solid Metals at Room Temperature with Continuous Electric Pulses

A solid metal, electric pulse technology, applied in the field of metal material processing, can solve problems such as white spots and brittle fractures, and achieve the effects of avoiding cracks, improving efficiency, and shortening processing time

Active Publication Date: 2020-12-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for quickly eliminating hydrogen in solid metals at room temperature by using electric pulses, solving the current hydrogen embrittlement problems such as white spots and brittle fractures caused by hydrogen in metals, and providing a solution for rapid elimination of hydrogen content in metals in actual production. new method

Method used

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  • A Method for Rapidly Eliminating Hydrogen in Solid Metals at Room Temperature with Continuous Electric Pulses
  • A Method for Rapidly Eliminating Hydrogen in Solid Metals at Room Temperature with Continuous Electric Pulses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Firstly, the 1080 rebar sample was treated with electric pulse, and the effect and law of hydrogen removal by electric pulse were detected.

[0035] The first step: process the 1080 rebar sample into a square column of 50mm×5mm×5mm, and then use 1200 mesh sandpaper for surface polishing.

[0036] Step 2: Connect the sample to both ends of the electric pulse power supply, and ensure good contact between the sample and the wires at both ends of the electric pulse power supply. Select frequency 100Hz, pulse width 100μs, current 200A, electric pulse treatment 2h.

[0037] Step 3: Measure the hydrogen of the 1080 rebar sample treated by electric pulse with LECO TCH600 oxygen, nitrogen and hydrogen analyzer, and compare it with the original 1080 sample without pulse treatment.

[0038] After detection and analysis by the instrument, the hydrogen content in the sample without pulse treatment was 3.7ppm, while the hydrogen content in the 1080 steel after pulse treatment was 2....

Embodiment 2

[0040] The first step: process the 1080 rebar sample into a square column of 50mm×5mm×5mm, and then use 1200 mesh sandpaper for surface polishing.

[0041] Step 2: Hold the two electrodes of the pulse power supply on one end of the sample and the center of the sample respectively. Make sure that the sample is in good contact with the wires at both ends of the electric pulse power supply. Select frequency 200Hz, pulse width 200μs, current 500A, electric pulse treatment 1h.

[0042] The third step: use the LECO TCH600 oxygen, nitrogen and hydrogen analyzer to compare the hydrogen content of the pulse treated end and the untreated end of the 1080 thread sample.

[0043] After the detection and analysis of the instrument, the hydrogen content of the 1080 rebar without pulse treatment is 1.75ppm. The hydrogen content in the pulsed sample was 0.5 ppm. After comparison, it was found that the hydrogen content of 1080 rebar was significantly reduced after electric pulse treatment, a...

Embodiment 3

[0045] Step 1: Process the unannealed 830 rebar into a sample with a diameter of 5mm and a length of 50mm, and polish the surface and both ends to remove the rust layer on the surface.

[0046] Step 2: Connect the two ends of the sample to the wires at both ends of the electric pulse to ensure good contact between them, and perform pulse treatment. Select frequency 500Hz, pulse width 500μs, current 100A, electric pulse treatment 2h.

[0047] Step 3: Use the LECO TCH600 oxygen, nitrogen and hydrogen analyzer to measure the hydrogen content of the 830 non-annealed samples that have undergone pulse treatment, and measure the 830 non-annealed samples that have not undergone pulse treatment at the same time.

[0048] After detection and analysis by the instrument, the hydrogen content of the 830 unannealed samples without pulse treatment is 2.2ppm, 2.4ppm, and 2.3ppm. The hydrogen content of the 830 unannealed samples after pulse treatment was 1.0ppm, 1.8ppm, and 1.1ppm, respectivel...

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Abstract

The invention belongs to the field of metal material treatment, and particularly relates to a method for rapidly eliminating hydrogen in solid metal at room temperature. The method treats solid metalin an electric pulse way, and comprises the first step of carrying out surface pretreatment on a solid metal block to be treated, the second step of connecting the solid metal block treated in the first step to electric pulse equipment, and the third step of starting the electric pulse equipment for carrying out hydrogen removal treatment on the solid metal block by using the electric pulse. Afterthe electric pulse treatment, the hydrogen content in the metal is obviously reduced, the hazards of hydrogen embrittlement, white spots, hydrogen corrosion and the like during use and work of the metal are reduced, and the service life of the metal is prolonged. The method is different from the electromagnetic heating effect, and the pulse current has a pure physical effect different from the temperature rise in the treatment process. Compared with an existing method for eliminating hydrogen in metal by utilizing heat treatment or natural aging, the electric pulse hydrogen removal method ismore economical and faster, small in occupied area and convenient to use.

Description

technical field [0001] The invention belongs to the field of metal material processing, and in particular relates to a method for rapidly eliminating hydrogen in solid metal by continuous electric pulse processing at room temperature. Background technique [0002] During the smelting and processing of metals, hydrogen is often incorporated into the metal. In addition, hydrogen has active chemical properties. During the solidification or phase transition of metals, hydrogen exists in metals in the form of hydrides or molecules, which affect the service life of metals in different ways. [0003] Among the various hazards caused by hydrogen in related metals, hydrogen embrittlement, white spots, and hydrogen corrosion are the most common. Hydrogen embrittlement is also called hydrogen damage, which refers to the phenomenon that the hydrogen in the metal reduces the plasticity of the metal. Due to the different sources of hydrogen atoms and the different states of hydrogen ato...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D3/06
CPCC21D3/06
Inventor 张新房向思奇马瑞
Owner UNIV OF SCI & TECH BEIJING