A Zirconium-Based Alloy Resistant to Alkaline Water Corrosion
A zirconium-based alloy and alkali-resistant technology, which is applied in the field of zirconium-based alloys, can solve problems such as poor corrosion resistance, and achieve the effects of maintaining stability, small particle size, and high corrosion resistance
Active Publication Date: 2020-04-21
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology
Through research, it is found that when corroded in deionized water, the corrosion resistance becomes worse in the order of E110>E635>ZIRLO>Zr-4; when corroded in LiOH aqueous solution, the corrosion laws of several zirconium alloys are different from those in deionized water , the corrosion resistance becomes worse in the order of Zr-Sn-Nb alloy>Zr-4>E110
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[0040] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings. As a limitation of the present invention.
[0041] The process of the present invention for preparing the zirconium-based alloy material resistant to alkaline water corrosion specifically includes the following steps:
[0042] (1) batching each component in the zirconium alloy according to the design composition;
[0043] (2) Smelting in a vacuum consumable electric arc furnace to make alloy ingots;
[0044] (3) Forging the alloy ingot in the β-phase region of 900°C to 1200°C to form a billet of the required shape;
[0045] (4) Heating and homogenizing the billet in the β-phase region of 1000°C to 1200°C, and performing quenching treatment;
[0046] (5) Hot-working the quenched billet in the α-phase region of 600°C to 700°C;
[0047] (6) cold-work...
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Abstract
A zirconium-based alloy resistant to alkaline water corrosion, composed of the following components by weight percentage: Sn: 0.3‑0.5, Nb: 0.2‑0.5, Fe: 0.1‑0.4, Cr: 0.1‑0.4, V, Ni, One or more elements in Si: 0.004‑0.02, O: 0.08‑0.16, the balance is Zr and other impurities. The present invention reduces the content of Sn and Nb in the zirconium alloy, adds Fe, Cr element, one or more elements in V, Ni, Si, and adjusts the content of alloy elements such as Fe, Cr, V, Ni, Si to Appropriate level improves the corrosion resistance of zirconium alloy in lithium hydroxide aqueous solution. Put the zirconium alloy in 70ppm lithium-containing water and corrode it for 250 days at a temperature of 360°C and a pressure of 18.6MPa. The corrosion weight gain of the zirconium alloy does not increase. More than 65mg / dm 2 , the corrosion rate is lower than 0.260mg / dm 2 / d.
Description
technical field [0001] The invention relates to the field of special alloy materials, in particular to a zirconium-based alloy resistant to alkaline water corrosion. Background technique [0002] Due to the small thermal neutron absorption cross-section, zirconium alloy has good corrosion resistance in high temperature and high pressure water and steam, and has quite good resistance to neutron radiation in the reactor, so it is widely used as a component of nuclear power water-cooled reactors. The cladding material is also the only cladding material currently used in nuclear power plant reactors. [0003] In the early days, cladding materials were usually made of Zr-2 and Zr-4 alloys. With the further development of nuclear power, on the basis of ensuring the safety of nuclear reactors, it is necessary to improve the economics of nuclear reactors and reduce the operating costs of nuclear power. Therefore, the goals of long life, high burnup, and zero damage are proposed for...
Claims
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IPC IPC(8): C22C16/00C22C1/02C22F1/18
CPCC22C1/02C22C16/00C22F1/002C22F1/186
Inventor 程竹青戴训赵文金彭倩彭小明杨忠波杨静
Owner NUCLEAR POWER INSTITUTE OF CHINA