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Metal uranium surface water-blocking hydrogen-blocking Al/Al2O3 composite plating layer and preparing method thereof

A technology of composite coating and metal uranium, applied in the direction of metal material coating process, coating, sputtering plating, etc., can solve problems affecting performance, corrosion, etc.

Active Publication Date: 2020-01-10
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the chemical properties of metal uranium are lively, and during its use and storage, it is very easy to react with the environment medium (water, hydrogen) and cause corrosion, which will affect its performance.

Method used

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  • Metal uranium surface water-blocking hydrogen-blocking Al/Al2O3 composite plating layer and preparing method thereof
  • Metal uranium surface water-blocking hydrogen-blocking Al/Al2O3 composite plating layer and preparing method thereof
  • Metal uranium surface water-blocking hydrogen-blocking Al/Al2O3 composite plating layer and preparing method thereof

Examples

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Embodiment 1

[0057] This example prepares 10 µm Al / Al on the surface of metal uranium 2 o 3 Composite coating, preparation process and process parameters such as figure 2 As shown, the preparation process is as follows.

[0058] 1) Substrate pretreatment

[0059] The oxide layer on the surface of the uranium metal was removed by mechanical grinding and polishing, and then the surface of the uranium metal from which the oxide layer was removed was cleaned with absolute ethanol, acetone, and dry nitrogen. Put the cleaned metal uranium into the vacuum chamber, use two magnetic levitation molecular pumps with a pumping speed of 2200L / s as the main pump, and work simultaneously with a cryopump with a pumping speed of 7500L / s to vacuum the vacuum chamber to 3×10 -4 Pa, and degas the vacuum chamber by baking, the baking temperature is 80°C, and the baking time is 30min. Subsequently, the vacuum chamber after baking was filled with high-purity argon to 2.0Pa, and a pulse bias of -800V was ap...

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Abstract

The invention discloses a metal uranium surface water-blocking hydrogen-blocking Al / Al2O3 composite plating layer and a preparing method thereof. The purpose is to develop the corrosion-resistant plating layer which has high density and particularly can effectively block water and hydrogen penetration so as to solve the problem about surface corrosion of metal uranium materials. The composite plating layer uses uranium as a base body and is formed by alternately depositing an Al plating layer and an Al2O3 plating layer. According to the composite plating layer and the preparing method, the aluminum oxide plating layer has a function of closing pores of the aluminum plating layer, and the following effects are achieved, wherein on one hand, introduction of the aluminum oxide plating layer prevents continuous growth of columnar grains of the aluminum plating layer, so that penetrating holes and defects in the plating layer are greatly reduced, the compactness of the plating layer is improved, and the number of permeation channels of corrosive media such as water and hydrogen is significantly reduced; and on the other hand, aluminum oxide is of a dense structure, is stable in performance and low in hydrogen permeability and can more effectively block penetration of small atomic size corrosion media such as hydrogen, and the protection performance of the plating layer on the base body is improved. It is determined that the composite plating layer can effectively block penetration of environmental atmospheres such as the water and the hydrogen on the uranium.

Description

technical field [0001] The invention relates to the field of metal protection, especially the technical field of anti-corrosion technology for active metal surfaces, specifically a water-repelling and hydrogen-repelling Al / Al on the surface of metal uranium 2 o 3 Composite coating and its preparation method. More specifically, the present application provides a water-repelling and hydrogen-repelling protective layer on the surface of metal uranium, that is, a preparation method of the protective layer. Background technique [0002] Due to its unique physical properties, metallic uranium is widely used in the nuclear industry and military fields. However, the chemical properties of metal uranium are active, and during its use and storage, it is very easy to react with environmental media (water, hydrogen) and cause corrosion, which will affect its performance. For the corrosion protection of uranium materials, the most widely used method is to use physical or chemical coat...

Claims

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Application Information

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IPC IPC(8): C23C14/35C23C14/08C23C14/16C23C14/18
CPCC23C14/35C23C14/0036C23C14/165C23C14/185C23C14/081
Inventor 王庆富刘柯钊江帆鲜晓斌法涛汪小琳丁晶晶
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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