Liquid-state lead bismuth alloy corrosion resisting coating layer and preparation method thereof

A technology of liquid lead-bismuth alloy and corrosion coating, which is applied in metal material coating process, coating, fusion spraying, etc., can solve the problems of high cost and complicated process, and achieve low cost, high efficiency and small speed gradient Effect

Active Publication Date: 2018-11-23
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thermal spraying MCrAlY (M=Fe, Ni, Co or NiCo) series coatings have excellent high temperature oxidation and hot corrosion resistance, but usually need to be used in combination with pulsed electron beam treatment or laser remelting process to improve the density of the coating , the process is relatively complex and costly

Method used

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  • Liquid-state lead bismuth alloy corrosion resisting coating layer and preparation method thereof
  • Liquid-state lead bismuth alloy corrosion resisting coating layer and preparation method thereof
  • Liquid-state lead bismuth alloy corrosion resisting coating layer and preparation method thereof

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preparation example Construction

[0023] The embodiment of the present invention provides a method for preparing the above liquid lead-bismuth alloy corrosion-resistant coating, including:

[0024] Select the substrate, degrease and degrease the substrate, and then pre-treat the position to be sprayed. The pretreatment in the embodiment of the present invention includes sand blasting treatment, transferred arc cleaning and preheating treatment.

[0025] Sand blasting can remove the adsorbate and oxide layer on the surface of the substrate to increase surface activity and improve the bonding strength between the coating and the substrate. In order to reduce the erosion of the surface of the prepared coating when the liquid LBE flows during service, the prepared coating should have a lower roughness to ensure the good fluidity of the liquid LBE. Therefore, compared with the conventional sandblasting treatment, this In the invention, the sandblasting pressure is lower and the sand grain size is finer. During th...

Embodiment 1

[0036] This embodiment provides a liquid lead-bismuth alloy corrosion-resistant coating, which is mainly made through the following steps:

[0037] Degrease and degrease the SIMP martensitic heat-resistant steel substrate, use white corundum sandblasting to roughen the sprayed surface, the sand particle size is 60#, the sandblasting pressure is 0.15MPa, and the sandblasting distance is 200mm. Grit or dust.

[0038] Put the sandblasting roughened substrate into the sample holder and place it in a low-pressure plasma spraying vacuum chamber, evacuate to 0.5mbar, then backfill with argon gas to 35mbar, and perform transfer arc cleaning on the substrate, the current of the plasma spray gun is 900A, transfer The arc current is 25A, the argon gas is 90L / min, the hydrogen gas is 4L / min, the spray distance is 350mm, and the spray gun moving speed is 150mm / s.

[0039] The preheating treatment is carried out without powder feeding, the vacuum chamber pressure is 35mbar, the plasma spra...

Embodiment 2

[0044] This embodiment provides a liquid lead-bismuth alloy corrosion-resistant coating, which is mainly made through the following steps:

[0045] Degrease and degrease the T91 martensitic heat-resistant steel substrate, use zirconium corundum to roughen the sprayed surface, the sand particle size is 80#, the sandblasting pressure is 0.18MPa, and the sandblasting distance is 220mm. Grit or dust.

[0046] Put the sandblasting roughened substrate into the sample holder and place it in a low-pressure plasma spraying vacuum chamber, evacuate to 0.5mbar, then backfill with argon gas to 40mbar, and perform transfer arc cleaning on the substrate, the current of the plasma spray gun is 1000A, transfer The arc current is 28A, the argon gas is 100l / min, the hydrogen gas is 3l / min, the spray distance is 450mm, and the spray gun moving speed is 200mm / s.

[0047] The preheating treatment is carried out without powder feeding, the vacuum chamber pressure is 40mbar, the plasma spray gun cu...

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Abstract

The invention provides a liquid-state lead bismuth alloy corrosion resisting coating layer and a preparation method thereof and relates to the technical field of material surface treatment. The liquid-state lead bismuth alloy corrosion resisting coating layer comprises a matrix, a coating layer body and a thermally-growing oxide layer, wherein the coating layer body is attached to the surface of the matrix, the thermally-growing oxide layer is attached to the surface of the coating layer body, and the coating layer body is prepared from a material of FeCrAlY. The preparation method of the liquid-state lead bismuth alloy corrosion resisting coating layer comprises the steps: preparing the coating layer body on the surface of the pretreated matrix and then directly performing pre-oxidation treatment on the coating layer body. The FeCrAlY coating layer body of the liquid-state lead bismuth alloy corrosion resisting coating layer disclosed by the invention has good combination with the matrix; the liquid-state lead bismuth alloy corrosion resisting coating layer has the advantages of compact structure, even and controllable thickness, low oxygen content and low surface roughness; pre-oxidation is directly performed on the surface of the coating layer body to in situ generate an even, continuous and compact thermally-growing oxide layer, the thermally-growing oxide layer can directly contact a lead bismuth cooling agent for a long time, and liquid-state lead bismuth alloy corrosion resistance of the coating layer body is improved; a preparation process has the advantages of lowcost, high, efficiency, greenness, environmental friendliness and the like.

Description

technical field [0001] The invention relates to the technical field of material surface treatment, and in particular to a corrosion-resistant liquid lead-bismuth alloy coating and a preparation method thereof. Background technique [0002] In recent years, with the development and progress of society and the surge of population, the demand for energy has increased year by year. Nuclear power generation occupies an important position in the current world energy structure due to its characteristics of no air pollution, no greenhouse gas emissions, abundant uranium fuel reserves, high energy density, and low operating costs. Lead-cooled fast neutron reactor (LFR) has unique advantages in nuclear fuel breeding and nuclear waste disposal, and is expected to become the first fourth-generation advanced nuclear energy system to achieve engineering demonstration and commercial application. On the other hand, nuclear waste with radioactive pollution will be generated in the process o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/18C23C4/02
CPCC23C4/02C23C4/073C23C4/134C23C4/18
Inventor 杨焜刘敏邓子谦牛少鹏毛杰宋进兵邓春明邓畅光周克崧
Owner GUANGDONG INST OF NEW MATERIALS
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