Preparation method of insulation/tritium permeation resistance composite coating on surface of vanadium alloy

A technology of composite coating and vanadium alloy, which is applied in the direction of metal material coating process, coating, superimposed layer plating, etc., can solve the problems such as the decline of tritium resistance effect, the change of material mechanical properties, and the deviation from material design parameters, etc., to achieve Improvement of tritium blocking effect and service life

Pending Publication Date: 2021-11-02
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

Al formed by this method 2 o 3 Usually the thickness is <1μm, once cracks are formed, the tritium blocking effect will be greatly reduced
In addition, the high-temperature heat treatment method requires the material to be kept at high temperature for a long time (>1h), and changes in the heat treatment process of the material may lead to changes in the mechanical properties of the material, thereby deviating from the design parameters of the material.

Method used

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  • Preparation method of insulation/tritium permeation resistance composite coating on surface of vanadium alloy
  • Preparation method of insulation/tritium permeation resistance composite coating on surface of vanadium alloy
  • Preparation method of insulation/tritium permeation resistance composite coating on surface of vanadium alloy

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preparation example Construction

[0027] figure 1 A schematic diagram of a method for preparing a tritium-resistant insulating coating on the surface of a vanadium alloy according to an embodiment of the present invention is shown. Preparation methods include:

[0028] Step S1, pretreating the vanadium alloy substrate. Preferably, the pretreatment method used is grinding the vanadium alloy material, followed by alkali washing, then washing with deionized water, then pickling, and then washing with deionized water for use.

[0029] Step S2, performing hot-dip aluminum plating on the pretreated vanadium alloy substrate. Preferably, the aluminum plating agent is pure aluminum, the used plating flux is an aqueous solution of fluorine-containing salt, the aluminum plating treatment is carried out under the protection of an inert gas, and the plating flux treatment and preheating treatment are performed before aluminum plating.

[0030] Step S3, performing micro-arc oxidation treatment on the vanadium alloy mater...

Embodiment 1

[0033] Using V-4Cr-4Ti alloy as the base material, the surface of the vanadium alloy material is mechanically polished and smoothed, successively using 150#, 240#, 300#, 600# sandpaper to polish and smooth; after that, use Na 2 CO 3 Mixed with NaOH aqueous solution for alkaline washing; then use deionized water to clean; then use dilute hydrochloric acid aqueous solution to pickle; then use deionized water to wash, dry for use.

[0034] Configure the fluxing agent for hot-dip aluminum plating, the fluxing agent used is potassium fluorozirconate (K 2 ZrF 6 ) salt-saturated aqueous solution, the flux is kept at 80°C; the pretreated vanadium alloy is soaked in the flux for 15 minutes; and then dried with cold air to prepare for aluminum plating.

[0035] Hot-dip aluminum plating is carried out in a glove box filled with 1 atm argon as a protective gas, and the glove box is equipped with environmental temperature control facilities; the plating agent is 99.97% high-purity alumin...

Embodiment 2

[0040] The vanadium alloy matrix sample was pretreated according to the same method as in Example 1, followed by flux plating and hot-dip aluminum plating, and finally an electrolyte was prepared to perform micro-arc oxidation treatment on the aluminum-plated vanadium alloy matrix. The difference is that the flux used in this example is 10g / L KF aqueous solution, the temperature of the aluminum liquid used for aluminum plating is 780°C, and the aluminum plating time is 1min.

[0041] Through the above steps, a composite film vanadium alloy material with an oxide layer thickness of 38 μm was finally obtained, marked as A2.

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Abstract

The invention discloses a preparation method of an aluminum oxide tritium-resistant insulating coating on the surface of a vanadium alloy, and relates to the field of surface engineering technology and thermonuclear fusion application. The method comprises the following steps: pretreating a vanadium alloy matrix material; carrying out hot-dipping aluminum plating treatment on the pretreated matrix material; and carrying out micro-arc oxidation treatment on the surface of the material subjected to hot-dipping treatment. In this way, the aluminum oxide coating which is good in tritium resistance, insulativity and abrasion resistance and high in adhesive force and has self-repairing force can be prepared on the vanadium alloy matrix. The method can be used in the field of nuclear fusion tritium-resistant coatings of liquid lead-lithium breeder claddings.

Description

technical field [0001] The invention belongs to the technical field of coatings and surfaces, and in particular relates to the preparation of an aluminum oxide composite coating with controllable thickness on the surface of vanadium alloys, which has excellent wear resistance, corrosion resistance, insulation and resistance to hydrogen isotope penetration, and is suitable for magnetic confinement cores. Coating application of liquid lithium-lead self-cooling tritium-breeding cladding structural materials in a fusion tokamak. Background technique [0002] The Magnetic Confinement Fusion Tokamak (TOKAMAK) device is currently the most promising nuclear fusion device close to large-scale practicality. At present, the controllable thermonuclear fusion reaction relies on the nuclear fusion of deuterium and tritium (D, T) to release the energy of 14.1MeV neutrons, and one of the main raw materials for the reaction: the natural stock of tritium element is extremely small and must re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C2/12C23C2/26C25D11/06
Inventor 徐驰关浩浩王兴平薛文斌杜建成
Owner BEIJING NORMAL UNIVERSITY
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