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Chromium carbide dispersed chromium oxide/alumina composite hydrogen barrier coating material and preparation method

A technology of aluminum oxide coating and composite coating, which is applied in the direction of coating, metal material coating process, superimposed layer plating, etc., can solve the problem of weak bonding between coating and substrate, achieve good electroplating effect, and obtain materials The effect of easy access and convenient material collection

Inactive Publication Date: 2019-11-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The earliest disclosed hydrogen barrier coating is CN1971168 using Cr 2 o 3 As a hydrogen barrier material, it can prevent the penetration of hydrogen to a large extent, but due to thermal mismatch, the bonding force between the coating and the substrate is weak

Method used

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  • Chromium carbide dispersed chromium oxide/alumina composite hydrogen barrier coating material and preparation method
  • Chromium carbide dispersed chromium oxide/alumina composite hydrogen barrier coating material and preparation method
  • Chromium carbide dispersed chromium oxide/alumina composite hydrogen barrier coating material and preparation method

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preparation example Construction

[0023] The preparation method of the chromium carbide dispersed chromium oxide / alumina composite hydrogen barrier coating material proposed by the present invention comprises the following steps:

[0024] (1) Polish the surface of the stainless steel with sandpaper to 7000#, then polish it with flannelette until the surface of the stainless steel is bright, and seal the remaining 5 surfaces of the stainless steel with insulating tape to obtain a bright stainless steel substrate;

[0025] (2) Using the pulse electrochemical deposition method, put the stainless steel substrate in the above step (1) into the electroplating solution, the composition of the electroplating solution is: 0.5mol / L of CrCl3 ·6H 2 O, 0.8mol / L HCOOH, 0.65mol / L H 3 BO 3 , 1mol / L KCl, 1mol / L NH 4 Cl, 10g / L NH 4 Br and 0.2g / L sodium lauryl sulfate, the pH of the plating solution is 2, the temperature of the plating solution is 15-45°C, and the current density in the plating solution is 30-50A / dm 2 , the ...

Embodiment 1

[0030] (1) Polish the surface of the stainless steel with sandpaper to 7000#, then polish it with flannelette until the surface of the stainless steel is bright, and seal the remaining 5 surfaces of the stainless steel with insulating tape to obtain a bright stainless steel substrate;

[0031] (2) Using the pulse electrochemical deposition method, put the bright surface of the stainless steel substrate in the above step (1) into the electroplating solution, the composition of the electroplating solution is: 0.5mol / L of CrCl 3 ·6H 2 O, 0.8mol / L HCOOH, 0.65mol / L H 3 BO 3 , 1mol / L KCl, 1mol / L NH 4 Cl, 10g / L NH 4 Br and 0.2g / L sodium lauryl sulfate, the pH value of the plating solution is 2, the temperature of the plating solution is 15°C, and the current density in the plating solution is 30A / dm 2 , the pulse duty ratio is 50%, the electroplating time is 10 minutes, a Cr-C coating is obtained on the bright surface of the stainless steel substrate, and the thickness of the coa...

Embodiment 2

[0036] (1) Polish the surface of the stainless steel with sandpaper to 7000#, then polish it with flannelette until the surface of the stainless steel is bright, and seal the remaining 5 surfaces of the stainless steel with insulating tape to obtain a bright stainless steel substrate;

[0037] (2) Using the pulse electrochemical deposition method, put the bright surface of the stainless steel substrate in the above step (1) into the electroplating solution, the composition of the electroplating solution is: 0.5mol / L of CrCl 3 ·6H 2 O, 0.8mol / L HCOOH, 0.65mol / L H 3 BO 3 , 1mol / L KCl, 1mol / L NH 4 Cl, 10g / L NH 4 Br and 0.2g / L sodium lauryl sulfate, the pH value of the plating solution is 2, the temperature of the plating solution is 30°C, and the current density in the plating solution is 45A / dm 2 , the pulse duty ratio is 70%, the electroplating time is 30 minutes, a Cr-C coating is obtained on the bright surface of the stainless steel substrate, and the thickness of the coa...

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Abstract

The invention relates to a chrome carbide dispersed chrome oxide / aluminum oxide composite hydrogen resistance coating material and a preparation method thereof and belongs to the technical field of hydrogen permeation resistance materials. The coating material prepared by the method is prepared by dispersing chrome carbide into chrome oxide on a stainless steel substrate and depositing aluminum oxide. The composite coating is prepared by the following steps of forming uniform and dense Cr-C alloy on the stainless steel substrate through pulse electrochemical deposition, then controlling oxidation to produce a chrome carbide dispersed chrome oxide composite coating, finally, depositing the aluminum oxide on an atomic layer on the composite coating, and forming the a chrome carbide dispersedchrome oxide / aluminum oxide composite coating after annealing. The coating material has the advantage of simpleness in coating preparation technology, wherein the chrome carbide is mingled with a chrome oxide coating to exert the effect of pinning diffusion of hydrogen in a oxide grain boundary, the permeability of the hydrogen and isotopes thereof in stainless steel can be effectively lowered, and thus the purpose of hydrogen permeation resistance is achieved.

Description

technical field [0001] The invention relates to a chromium carbide dispersed chromium oxide / alumina composite hydrogen-resistant coating material and a preparation method thereof, belonging to the technical field of hydrogen-resistant permeable materials. Background technique [0002] Nuclear energy plays an important role in the development of new energy due to its clean, high efficiency and high energy density. Hydrogen and its isotopes play a vital role in the controlled use of nuclear energy. In fission reactors, the hydrogen absorption behavior of materials will seriously affect the corrosion resistance of materials and even hydrogen embrittlement will occur. In order to solve the problems caused by hydrogen permeation in the field of hydrogen-related applications, the hydrogen permeation barrier performance of materials or containers can be improved by preparing a hydrogen permeation barrier coating on the surface of the material. [0003] The hydrogen permeation-res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/04C23C16/40C25D5/48C25D3/56
CPCC23C16/403C23C28/042C25D3/56C25D5/48
Inventor 凌云汉王继鹏卢朝霞张政军
Owner TSINGHUA UNIV
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