Method for improving lead bismuth alloy corrosion resistance of nuclear power structural material

Abstract

The invention discloses a method for improving the lead bismuth alloy corrosion resistance of a nuclear power structural material. According to the method for improving the lead bismuth alloy corrosion resistance of the nuclear power structural material, surface treatment is conducted on the nuclear power structural material through the surface nanocrystallization technology, the surface of the nuclear power structural material is made to form a gradient nano-structure and a structure refined structural layer, the nuclear power structural material obtained after surface nanocrystallization generates a compact passivation coating with the thickness smaller than 5 [mu]m in liquid-state lead bismuth alloy, the passivation coating relieves the corrosion of the nuclear power structural material in the liquid-state lead bismuth alloy, and therefore the lead bismuth alloy corrosion resistance of the nuclear power structural material is improved. After surface treatment, the thickness of the surface gradient nanometer crystals and the structure refined structural layer of the nuclear power structural material reaches over 150[mu]m, the surface crystallite dimension is refined to be below 50 nm, and the surface roughness Ra is controlled to be below 0.3 [mu]m. After the nuclear power structural material is treated by the adoption of the method, compared with the nuclear power structural material which is not treated, the lead bismuth alloy corrosion resistance of the nuclear power structural material can be significantly improved.

Description

technical field [0001] The invention relates to the technical field of nuclear power structural materials, in particular to a method for improving the anti-corrosion performance of lead-bismuth alloy of nuclear power structural materials. Background technique [0002] As a clean energy, nuclear energy is getting more and more attention and development, and the ensuing nuclear waste disposal has become an urgent problem to be solved, and it has become one of the restrictive factors for the sustainable development of nuclear energy. The accelerator-driven subcritical system (ADS system) based on separation and transmutation technology is a new type of nuclear energy system for nuclear waste transmutation and energy generation, and has become one of the important technical directions for the development of new generation nuclear energy. The structural materials of the ADS system are used in harsh environments, and they need to have high temperature resistance, radiation resista...

AI Technical Summary

Problems solved by technology

However, the above two methods have certain disadvantages: the control of oxygen partial pressure and oxygen content is relatively difficult, and the corrosion resistance of lead-bismuth alloys of nuclear power structural materials cannot be fundamentally solved; the adjustment of low-activation ferrite / martensite The chemical composition of steel may lead to the weakening of other properties of the material, such as neutron radiation resistance, etc.; and the development cost of new materials is high and the cycle is long

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