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Method for preparing hydrogen permeation preventing coating by aluminizing by adopting room temperature fused salt

A room temperature molten salt and aluminum plating technology is applied in nuclear technology and application fields to achieve the effects of maintaining mechanical properties, improving tritium resistance and eliminating voids.

Inactive Publication Date: 2011-09-07
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to address the problems existing in the current nuclear technology and application fields, and propose a technology suitable for preparing a tritium-resistant coating on the surface of special-shaped parts such as the inner wall of a pipeline. This technology is suitable for the needs of industrialized large-scale production, and the PTRF in the gas phase is greater than 1000 , and has self-healing ability

Method used

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  • Method for preparing hydrogen permeation preventing coating by aluminizing by adopting room temperature fused salt
  • Method for preparing hydrogen permeation preventing coating by aluminizing by adopting room temperature fused salt
  • Method for preparing hydrogen permeation preventing coating by aluminizing by adopting room temperature fused salt

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Embodiment 1

[0031]Embodiment 1: on the tubular 1Cr18Ni9Ti austenitic stainless steel substrate surface preparation hydrogen permeable coating, the specific steps are as follows:

[0032] 1. Take a cylindrical 1Cr18Ni9Ti austenitic stainless steel substrate sample with a diameter of 60mm, a thickness of 3mm, and a height of 60mm, and first use conventional methods to degrease and remove the oxide film;

[0033] 2. Put the sample into the AlCl in the argon protection glove box 3 In a solution composed of 1-methyl-3-ethylimidazole chloride (EMIC), where AlCl 3 The molar ratio to 1-methyl-3-ethylimidazole chloride (EMIC) is 2:1. Then carry out aluminum plating at room temperature 25°C, current density 20mA / cm 2 , plating for 50min, to obtain an aluminum coating with a thickness of about 20μm, such as figure 1 As shown, the coating is well bonded to the substrate.

[0034] 3. After plating, the sample is heat-treated in an air furnace at a temperature of 750 ° C and kept for 4 hours to obt...

Embodiment 2

[0037] Embodiment 2: on the surface of the tubular HR-2 austenitic stainless steel substrate, a hydrogen-resistant permeable coating is prepared, and the specific steps are as follows: 1. get a tubular HR-2 austenitic stainless steel substrate sample with a diameter of 60 mm, a thickness of 3 mm, and a height of 60 mm. First, conventional methods are used to degrease and remove the oxide film;

[0038] 2. Put the sample into the AlCl in the argon protective glove box 3 In a solution composed of 1-methyl-3-ethylimidazole chloride (EMIC), where AlCl 3 The molar ratio to 1-methyl-3-ethylimidazole chloride (EMIC) is 2:1. Then aluminum plating is carried out at room temperature 25°C with a current density of 10mA / cm 2 , Plating for 100min, an aluminum coating with a thickness of about 20μm was obtained, and the coating was well bonded to the substrate.

[0039] 3. The sample after plating is heat-treated in an air furnace at a temperature of 750°C and held for 4 hours to obtain ...

Embodiment 3

[0042] Embodiment 3: A hydrogen permeation-resistant coating is prepared on the surface of a tubular HR-2 austenitic stainless steel substrate. The specific steps are as follows:

[0043] 1. Take a tubular HR-2 stainless steel substrate sample with a diameter of 60mm, a thickness of 3mm, and a height of 60mm, and first use conventional methods to degrease and remove the oxide film;

[0044] 2. Put the sample into the AlCl in the argon protective glove box 3 In a solution composed of 1-methyl-3-ethylimidazole chloride (EMIC), where AlCl 3 The molar ratio to 1-methyl-3-ethylimidazole chloride (EMIC) is 2:1. Then carry out aluminum plating at room temperature 25°C, current density 5mA / cm 2 , Plating for 200min, an aluminum coating with a thickness of about 20μm was obtained, and the coating was well bonded to the substrate.

[0045] 3. After plating, the sample is heat-treated in an air furnace at a temperature of 750 ° C and kept for 24 hours to obtain a Fe-Al alloy layer wit...

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Abstract

The invention discloses a method for preparing a hydrogen permeation preventing coating by aluminizing by adopting room temperature fused salt, comprising the following steps of: firstly, carrying out surface treatment of degreasing and oxidation film removing on strain steel matrix with a conventional method; secondly, aluminizing by adopting room temperature fused salt, wherein the room temperature fused salt for aluminizing is a system formed by AlCl3 and organic salt, the organic salt is one of alkyl pyridine halide, alkyl imidazole halide and alkaryl chloration ammonium salt, the mole ratio of the AlCl3 to the organic salt is larger than 1.0 and smaller than or equal to 2.0, the technical parameter for aluminizing by adopting room temperature fused salt is as follows: an aluminum wire as the anode has the temperature of 25-60 DEG C and the current density of 5-30mA / cm<2>, and the plating time is 30-200min; and thirdly, heat treatment to obtain an Fe-Al alloy layer, wherein the technical parameter for heat treatment is as follows: the temperature is 670-750 DEG C, and the time is 30min to 24h; fourthly, oxidation, wherein the technical parameter for oxidation is as follows: the temperature is 670-1050 DEG C, the time is 1-200h, and the oxygen partial pressure is 1.0*10-2 Pa to 2.1*104 Pa. The invention is suitable for preparing tritium permeation preventing coatings on surfaces of special-shaped pieces such as the inner wall of a pipeline, and the like, is suitable for the requirement of large-scale industrialized production, and has a self-healing function.

Description

technical field [0001] The invention belongs to the field of nuclear technology and application, and in particular relates to a method for preparing a surface hydrogen-resistant permeable coating, which is especially suitable for the preparation of a hydrogen-resistant coating for special-shaped parts such as the inner wall of a slender pipeline. Background technique [0002] The hydrogen isotope tritium is the fuel of nuclear fusion. Tritium is similar to hydrogen and has a high permeability in metal materials, resulting in the loss of valuable nuclear fuel and pollution to the environment. Therefore, in the equipment for tritium treatment, the metal container (stainless steel) in contact with tritium must have hydrogen (tritium) permeation resistance. A large number of research results show that the preparation of anti-tritium penetration coating on the surface of stainless steel is the most effective method. In the nuclear fusion project (ITER), anti-tritium penetration ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/66
Inventor 凌国平陈长安张桂凯李岩李炬刘柯钊
Owner ZHEJIANG UNIV
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