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Method for improving tellurium corrosion resistance of alloy material for molten salt stack, and alloy piece

A technology of alloy material and corrosion performance, applied in metal material coating process, reactor, nuclear power generation, etc., can solve problems such as enhanced tellurium corrosion resistance

Active Publication Date: 2020-04-24
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These alloy materials show significant advantages in resistance to tellurium corrosion, but considering the usual long service life of reactors, it is still necessary to continue to enhance their resistance to tellurium corrosion

Method used

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  • Method for improving tellurium corrosion resistance of alloy material for molten salt stack, and alloy piece
  • Method for improving tellurium corrosion resistance of alloy material for molten salt stack, and alloy piece
  • Method for improving tellurium corrosion resistance of alloy material for molten salt stack, and alloy piece

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preparation example Construction

[0021] The preparation of the oxide film can be realized by various existing or future technologies. At present, the techniques for obtaining surface oxide films by oxidizing easily oxidizable elements in the alloy to be treated include anodic oxidation and micro-arc oxidation. For example, aluminum alloys, magnesium alloys, titanium alloys, etc.) are effective, but are useless for other types of alloys (such as the molten salt reactor alloys involved in the present invention). For this reason, the present invention further proposes an oxide film preparation process with lower cost and simpler operation to prepare the oxide film, specifically as follows: the molten salt reactor alloy material is placed in a vacuum sealed quartz heating in the container, so that at least one active element contained in the alloy material for molten salt reactor undergoes an oxidation reaction with the hydroxyl group in the quartz to form a corresponding oxide film on the surface of the alloy ma...

Embodiment 1

[0032] Example 1: Formation of an oxide film on the surface of Nb-added Hastelloy N alloy and verification of its corrosion resistance to tellurium

[0033] Nb-added Hastelloy N alloy is a new nickel-based superalloy developed on the basis of Hastelloy N alloy to improve the corrosion resistance of tellurium. According to public reports, the composition of the alloy is (mass percentage): 6%-8% Cr, 10%-14% Mo, ≤0.2% Mn, ≤0.08%C, and the rest are Ni and unavoidable impurity elements.

[0034] In order to form an oxide film on the surface of Nb-added Hastelloy N alloy and verify its anti-tellurium corrosion performance, the alloy and the pure tellurium block as the source of tellurium corrosion were placed in a quartz tube for heat treatment at the same time. The specific process is as follows: (1) A quartz tube (one end closed) with a length of 35 cm, an inner diameter of 2 cm, and a thickness of 2 mm is selected as the packaging material; (2) the hydroxyl content is 92 ppm meas...

Embodiment 2

[0037] Example 2: Formation of oxide film on the surface of Ni-4Nb binary alloy and verification of its corrosion resistance to tellurium

[0038] The Ni-Nb binary alloy can be used as a functional layer to cover the surface of the existing alloy to resist tellurium corrosion. The preferred composition (mass percentage) of the alloy to exert the anti-corrosion performance of tellurium is 1-4% Nb, and the rest is Ni and unavoidable impurity elements. This implementation takes the Ni-Nb binary alloy containing 4%Nb as the implementation object.

[0039] In order to form an oxide film on the surface of the Ni-4Nb binary alloy and verify its anti-tellurium corrosion performance, the alloy and the pure tellurium block as tellurium corrosion were placed in a quartz tube for heat treatment at the same time. The specific process is as follows: (1) A quartz tube (one end closed) with a length of 35 cm, an inner diameter of 2 cm, and a thickness of 2 mm is selected as the packaging mat...

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Abstract

The invention discloses a method for improving tellurium corrosion resistance of an alloy material for a molten salt stack. At least one active element contained in the alloy material for the molten salt stack is subjected to oxidation reaction so as to form a corresponding oxide film on the surface of the alloy material. The invention also discloses an alloy piece. Based on the inhibition effectof the oxide film on the surface of the alloy discovered by the inventor for the first time on tellurium diffusion, tellurium diffusion is inhibited by utilizing the oxide film formed by active elements contained in the alloy material for the molten salt stack on the surface of the alloy material, so that the tellurium corrosion resistance of the alloy material for the molten salt stack is greatlyimproved at low cost.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a method for improving the anti-tellurium corrosion performance of alloy materials for molten salt reactors. Background technique [0002] Molten salt reactor is a new type of fission reactor that uses molten salt as a fuel carrier and heat energy transfer carrier. It has many advantages such as high thermal efficiency, inherent safety and availability of thorium fuel. The operating temperature of the reactor is 600°C~700°C, and highly corrosive molten salt is used as the coolant. Therefore, the reactor structural material must have excellent corrosion resistance to high temperature molten salt. In order to meet the harsh working conditions of molten salt reactors, researchers have developed Hastelloy N alloys and a series of new alloys with molten salt reactors as the application background, including GH3535 alloys, Nb-added alloys, Al-added alloys, Ni- W-Cr series allo...

Claims

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Application Information

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IPC IPC(8): C23C8/62G21C15/28
CPCC23C8/62G21C15/28Y02E30/30
Inventor 蒋力李志军王伟雷特吴博恒
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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