A preparation method of a hydrogen permeation-resistant coating on a metal hydride surface in a molten salt system

A hydride and metal technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problem that the inner wall of the deep hole cannot be protected by a corrosion-resistant layer, and achieves hard peeling and cracking. The effect of stable hydrogen permeation performance

Active Publication Date: 2018-12-07
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Niu Yunsong and others applied for a patent (application number 201310393275.1) "Magnesium Alloy Surface Molten Salt Oxygen Carbon Sulfur Co-infiltration Corrosion-Resistant Ceramic Coating and Its Preparation and Application", which aims to solve the problem of corrosion resistance of magnesium alloy workpieces and overcome the complex shape of magnesium alloys The disadvantage that the inner wall of the deep hole cannot be protected by the corrosion resistance layer
At present, there is no report on the method of preparing hydrogen-resistant permeable coatings on the surface of metal hydrides by using molten salt infiltration technology.

Method used

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  • A preparation method of a hydrogen permeation-resistant coating on a metal hydride surface in a molten salt system
  • A preparation method of a hydrogen permeation-resistant coating on a metal hydride surface in a molten salt system
  • A preparation method of a hydrogen permeation-resistant coating on a metal hydride surface in a molten salt system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Hydride workpiece pretreatment:

[0028] The surface of Φ20mm×20mm zirconium hydride is degreased, cleaned and polished, and the zirconium hydride H / Zr=1.0.

[0029] 2. Compound nitrate preparation:

[0030] According to the mass percentage, it is prepared with 30% of sodium nitrite, 10% of sodium nitrate and 60% of potassium nitrate, heated to 280°C to fully melt each component, stir evenly, cool and solidify, then crush to obtain compound nitrate.

[0031] 3. Molten salt heat treatment of zirconium hydride:

[0032] (1) Put the composite nitrate and the zirconium hydride workpiece together into a stainless steel crucible and place it in a heating furnace.

[0033] (2) The heating furnace is raised from room temperature to 150°C at a rate of 10°C / hour, kept for 1 hour, continued to heat up to 450°C, kept at a temperature of 20 hours, cooled to 150°C at 600°C / hour, and the hydride workpiece was taken out and cooled to room temperature.

[0034] 4. Post-processing ...

Embodiment 2

[0038] 1. Hydride workpiece pretreatment:

[0039] Degrease, clean and polish the surface of Φ20mm×20mm zirconium hydride, zirconium hydride H / Zr=1.6.

[0040] 2. Compound nitrate preparation:

[0041] According to mass percentage, sodium nitrate: 60% and potassium nitrate: 40% are prepared, melted at 300°C, cooled and solidified, and broken to obtain compound nitrate.

[0042] 3. Molten salt heat treatment of zirconium hydride:

[0043] (1) Put the composite nitrate and the zirconium hydride workpiece together into a stainless steel crucible and place it in a heating furnace.

[0044] (2) The heating furnace is raised from room temperature at 600°C / hour to 200°C, kept for 1 hour, continued to heat up to 650°C, kept at temperature for 10 hours, cooled to 280°C at 600°C / hour, and the hydride workpiece was taken out and cooled to room temperature.

[0045] 4. Post-processing of hydride workpieces:

[0046] The zirconium hydride workpiece was placed in deionized water, ultrason...

Embodiment 3

[0048] 1. Hydride workpiece pretreatment:

[0049] The Φ20mm×20mm titanium hydride surface is degreased, cleaned and polished, and the zirconium hydride H / Ti=1.0.

[0050] 2. Compound nitrate preparation:

[0051] According to mass percentage, it is prepared as sodium nitrite: 50%, sodium nitrate: 30%, potassium nitrate: 20%, is heated to 180°C to fully melt each component, stirs evenly, cools and solidifies, and breaks to obtain compound nitrate.

[0052] 3. Molten salt heat treatment of titanium hydride:

[0053] (1) Put the composite nitrate and the titanium hydride workpiece together into a stainless steel crucible and place it in a heating furnace.

[0054] (2) The heating furnace rises from room temperature at 600°C / hour to 200°C, holds for 10 hours, continues to heat up to 650°C, holds for 40 hours, cools to 280°C at 600°C / hour, takes out the workpiece and cools to room temperature.

[0055] 4. Workpiece post-processing:

[0056] The titanium hydride workpiece was p...

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Abstract

The invention discloses a preparation method of a hydrogen retention permeable coating on the surface of a metal hydride in a fused salt system and belongs to the technical field of surface protection of a metal hydride material. According to the preparation method disclosed by the invention, by adopting a compound nitrate fused salt system, a reaction is performed with the metal hydride through surface treatment at a high temperature of 300-600 DEG C to form the hydrogen retention permeable coating comprising oxynitride on the surface of the metal hydride. The method is not limited by complicated shapes and structures of matrixes; a protective film is generated at a relatively low temperature, and hydrogen loss is avoided in a film making process; the prepared hydrogen retention permeable coating is well combined with the matrix, is continuous and compact, and contains oxygen and nitrogen components, so that the problems that interlayered defects exist between a nitride film layer and an oxide film layer which are laminated, and the interlayered bonding is not compact and the like are solved, and the coating has a synergic hydrogen retention effect. The hydrogen retention permeable coating prepared by the method can effectively prevent hydrogen in a metal hydride matrix from diffusing and separating out outward. The method also can be used for preparing the hydrogen retention permeable coating for the surface of stainless steel, so that the hydrogen retention permeable property of alloys such as stainless steel is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of metal hydride material surface protection, and relates to a method for preparing a hydrogen permeation-resistant coating on the surface of metal hydride in a molten salt system. technical background [0002] Metal hydrides have the functions of hydrogen storage and hydrogen fixation, and are often used as hydrogen-carrying materials. In the field of storage of hydrogen and its isotopes, as well as under the use conditions of certain hydrides, keeping hydrogen in hydrides from being lost at high temperatures is an important performance index of materials, and the hydrogen permeable coating is an important measure to prevent hydrogen loss and leakage . [0003] At present, the research on hydrogen permeation barrier coatings is mainly focused on hydrogen storage and protection materials. In order to avoid the loss of nuclear fuel and reduce environmental pollution, materials must have as low a hydrogen per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/52
CPCC23C8/52
Inventor 王力军闫国庆陈洋彭家庆吴明张建东张顺利
Owner 有研资源环境技术研究院(北京)有限公司
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