Treatment method for improving corrosion resistance of steel material in lead or lead bismuth

A technology of iron and steel materials and processing methods, which is applied in the fields of metal material coating technology, nuclear power generation, climate sustainability, etc., can solve the problems of oxide layer dissolution, steel matrix erosion, coolant blockage, coolant oxidation, etc., and achieve improvement Anti-corrosion ability, reduce consumption, and enhance the effect of anti-corrosion performance

Active Publication Date: 2022-05-31
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The protection of steel materials by forming an oxide layer puts forward higher requirements on the oxygen control of the coolant. Excessively high oxygen content will lead to oxidation of the coolant, which may cause serious consequences such as coolant blockage. Too low oxygen content will lead to oxidation. The dissolution of the steel layer and the corrosion of the steel material matrix, under high temperature conditions, when the coolant dissolves and erodes the steel, this protection method may fail
The surface coating of the material, such as aluminum alloy coating on the surface of the material, is still protective after 1500 hours in 550 ° C oxygen-controlled liquid lead, but the disadvantage of the surface coating is that it has the risk of peeling failure

Method used

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  • Treatment method for improving corrosion resistance of steel material in lead or lead bismuth
  • Treatment method for improving corrosion resistance of steel material in lead or lead bismuth
  • Treatment method for improving corrosion resistance of steel material in lead or lead bismuth

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Embodiment 1

[0028] The invention provides a treatment method for improving the corrosion resistance of iron and steel materials in lead or lead-bismuth, comprising the following steps:

[0029] Using 14MeV high-energy fast neutrons produced by fission, the steel material is irradiated at a temperature of 700°C, and the radiation dose is 700dpa, so that the Mn and Cr elements in the steel material diffuse to the surface of the steel material Forming a dense oxide film, irradiating for 10 minutes until the thickness of the dense oxide film is 30nm, that is, the improvement of the anti-corrosion performance of the steel material is completed;

[0030] Wherein, the steel material is ferritic martensitic steel, and in the ferritic martensitic steel, the content of Cr is 10wt%, and the content of Mn is 1.5wt%.

Embodiment 2

[0032] The invention provides a treatment method for improving the corrosion resistance of iron and steel materials in lead or lead-bismuth, comprising the following steps:

[0033] Using 14MeV high-energy fast neutrons produced by fission, the steel material is irradiated at a temperature of 500°C, and the radiation dose is 300dpa, so that the Mn and Cr elements in the steel material diffuse to the surface of the steel material Forming a dense oxide film, irradiating for 10 hours until the thickness of the dense oxide film is 40nm, that is, the improvement of the corrosion resistance of the steel material is completed;

[0034] Wherein, the steel material is ferritic martensitic steel, and in the ferritic martensitic steel, the content of Cr is 9wt%, and the content of Mn is 1wt%.

Embodiment 3

[0036] The invention provides a treatment method for improving the corrosion resistance of iron and steel materials in lead or lead-bismuth, comprising the following steps:

[0037] Using 14MeV high-energy fast neutrons produced by fission, the steel material is irradiated at a temperature of 400°C, and the radiation dose is 100dpa, so that the Mn and Cr elements in the steel material diffuse to the surface of the steel material Forming a dense oxide film, irradiating for 30 hours until the thickness of the dense oxide film is 50nm, the improvement of the anti-corrosion performance of the steel material is completed;

[0038] Wherein, the steel material is ferritic-martensitic steel, and in the ferritic-martensitic steel, the content of Cr is 8wt%, and the content of Mn is 0.5wt%.

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Abstract

The invention belongs to the technical field of nuclear reactor materials, and discloses a treatment method for improving the corrosion resistance of a steel and iron material in lead or lead bismuth, the steel and iron material containing Mn element and Cr element is selected, high-energy fast neutrons generated by fission are adopted as an irradiation source, the steel and iron material is irradiated, and the corrosion resistance of the steel and iron material in lead or lead bismuth is improved. And the Mn element and the Cr element in the steel and iron material are diffused to the surface of the steel and iron material to form a compact oxidation film, and the corrosion resistance of the steel and iron material is improved. Formation of the oxidation layer with a compact structure is enhanced through irradiation, the oxidation layer has good protectiveness and has the self-repairing characteristic in the irradiation environment, and a new solution thought is provided for enhancing the corrosion resistance of the steel in the lead and lead bismuth coolant fast reactor.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor materials, in particular to a treatment method for improving the corrosion resistance of iron and steel materials in lead or lead-bismuth. Background technique [0002] Fast neutron reactors (referred to as fast reactors) can greatly improve the utilization of uranium resources and realize a closed fuel cycle. Lead and lead-bismuth eutectic alloys are one of the candidate coolants for fast reactors. [0003] At high temperatures, lead and lead-bismuth coolants severely corrode steel as container and structural materials. Selective dissolution of steel and intergranular corrosion of lead-bismuth will cause material failure, and flowing coolant will further accelerate corrosion. For the corrosion of iron and steel materials in lead and lead-bismuth and the degradation of their mechanical properties, there are currently two main ways to deal with them: first, surface oxidation of materials; s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/14G21C15/28
CPCC23C8/14G21C15/28Y02E30/30C22C38/04C21D1/74C21D10/00C22C38/18C23C8/02G21C3/07C21D2211/005C21D2211/008C23C10/54C23C10/60G21C1/02
Inventor 恽迪徐钰雯严伟李艳芬顾龙邱杰郭少强柳文波姚存峰
Owner XI AN JIAOTONG UNIV
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