Preparation method of aluminized coating for improving lead and bismuth corrosion resistance of ferrite-martensite steel

A martensitic steel, corrosion performance technology, applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of matrix structure coarsening, austenitization, and reducing the mechanical properties of the matrix, and achieve Good binding force, convenient operation, and the effect of improving the corrosion resistance of lead and bismuth

Active Publication Date: 2021-07-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

In addition, for the ferritic-martensitic steel whose service temperature does not exceed 700°C, too high aluminizing temperature will cause the matrix structure to be coarsened or even austenitized, reducing the mechanical properties of the matrix

Method used

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  • Preparation method of aluminized coating for improving lead and bismuth corrosion resistance of ferrite-martensite steel
  • Preparation method of aluminized coating for improving lead and bismuth corrosion resistance of ferrite-martensite steel
  • Preparation method of aluminized coating for improving lead and bismuth corrosion resistance of ferrite-martensite steel

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Embodiment 1

[0031] This embodiment provides 9Cr2WVTa ferrite-martensitic steel plate, chemical composition (wt.%) is: C: 0.11%, Cr: 8.86%, W: 1.62%, V: 0.24%, Ta: 0.11%, Mn : 0.45%, Si: 0.05%, S: 0.005%, P: 0.005%, and the balance is Fe.

[0032] The components of the aluminizing agent used are: 2% NH by mass ratio 4 Cl powder (200 mesh), 98wt.% Fe50Al50 (molar ratio) powder (200 mesh). The specific implementation steps of aluminized coating preparation:

[0033] 1) Heat treatment: Quenching and tempering heat treatment for ferritic-martensitic steel. The quenching treatment is 1020°C for 60 minutes and then water cooling, and the tempering treatment is 750°C for 2 hours and then air cooling.

[0034] 2) Surface treatment: Mechanically polish the surface of the sample with a size of 10mm×10mm×5mm to completely remove the surface oxide skin and make the surface reveal a metallic luster.

[0035] 3) Activation treatment: use HCl solution with a volume fraction of 10% for surface activati...

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Abstract

The invention discloses a preparation method of an aluminized coating for improving lead and bismuth corrosion resistance of ferrite-martensite steel, and belongs to the technical field of corrosion protection of nuclear materials. Firstly, the ferrite-martensite steel is subjected to quenching and tempering thermal treatment including quenching and tempering, and then surface treatment and activating treatment are sequentially carried out; secondly, activated samples are embedded in uniformly-mixed aluminizing agent powder, the enough distances are kept among the samples, and the samples are placed into a double-layer quartz tube aluminizing device; and finally, the aluminizing device is placed into a muffle furnace for aluminizing treatment. The aluminized coating comprising the FeAl phase is prepared through the method, the aluminized coating is uniform and compact, the binding force between the aluminized coating and a matrix is large, and the aluminized coating has good lead and bismuth corrosion resistance; and meanwhile, the mechanical property of the matrix cannot be damaged by the aluminizing technology. The method is convenient to operate and lower in cost, is not limited by sizes and shapes of workpieces, and is convenient for industrial popularization.

Description

technical field [0001] The invention relates to the technical field of corrosion protection of nuclear materials, in particular to a method for preparing an aluminized coating for improving the lead-bismuth corrosion resistance of ferrite-martensitic steel. Background technique [0002] Lead-bismuth eutectic alloys are used as coolants for fourth-generation lead-bismuth cooled fast reactors, as well as coolants and spallation target candidates for accelerator-driven subcritical systems (ADS). However, the high temperature and flowing liquid lead and bismuth will have a strong corrosion effect on structural materials, which will endanger the safe operation of the reactor. How to improve the compatibility of structural materials with liquid lead-bismuth alloys has become an urgent problem to be solved. 9-12%Cr ferritic-martensitic steel has good thermophysical properties and excellent resistance to radiation swelling, and is considered as the preferred structural material for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/50C23C10/02C21D1/18
CPCC23C10/50C23C10/02C21D1/18C21D2211/005C21D2211/008
Inventor 陈胜虎戎利建姜海昌闫德胜赵明久胡小峰宋元元张洋鹏赵帅
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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