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A method for improving the liquid metal corrosion resistance of martensitic heat-resistant steel

A technology of liquid metal and heat-resistant steel, which is applied in the field of metal surface treatment, can solve problems such as poor wettability and restrict the sustainable development of nuclear power, and achieve the effect of prolonging the service life and improving the corrosion resistance of liquid metal

Active Publication Date: 2018-06-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nuclear power is an ideal choice to meet these challenges, but the problem of nuclear waste disposal has always restricted the sustainable development of nuclear power
Studies have shown that the unique chemical inertness of enamel coatings results in poor wettability with liquid lead-bismuth and chemical bonding with the alloy matrix to form an interface. The price is relatively low and the ability to resist interface peeling is usually better than that of traditional ceramic coatings. It is popular for its excellent high temperature oxidation resistance, but there are few domestic and foreign reports on the corrosion resistance of enamel coatings to liquid lead and bismuth under low oxygen concentration.

Method used

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  • A method for improving the liquid metal corrosion resistance of martensitic heat-resistant steel
  • A method for improving the liquid metal corrosion resistance of martensitic heat-resistant steel
  • A method for improving the liquid metal corrosion resistance of martensitic heat-resistant steel

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Experimental program
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Effect test

Embodiment 1

[0020] (1) Pretreatment of the metal surface: the metal sample with a size of 15mm × 10mm × 2mm was polished step by step to No. 600 with metallographic sandpaper, and all the edges and corners were rounded, and then the metal surface was sandblasted. Ultrasonic cleaning in deionized water after metal detergent cleaning, drying;

[0021] (2) Melt the optimally designed enamel ingredients at a high temperature of 1400°C, water-cool after fully reacting, and make enamel powder through ball milling. The main component of enamel is SiO 2 : 58.26%, Al 2 o 3 : 19.2%, CaO: 3.66%, ZrO 2 : 5.29%, B 2 o 3 : 4.66%, Na 2 O: 3.40%, KNO 3 : 5.53%;

[0022] (3) Mix the enamel powder with absolute ethanol, spray it on the metal surface, and sinter it on the metal surface at 730°C±10°C to form an enamel coating of about 40 μm through curing reaction after drying.

[0023] The above metal material is martensitic heat-resistant steel, the specific chemical composition is: C: 0.25wt.%, Si...

Embodiment 2

[0026] The chemical composition of 9-12% Cr martensitic heat-resistant steel is: C: 0.19wt.%, Si: 1.05wt.%, Cr: 10.05wt.%, Mn: 1.06wt.%, W: 1.19wt.%. , Ta: 0.1wt.%, V: 0.2wt.%, Nb: 0.01wt.%, and the balance is iron. Other surface treatment processes of the metal are the same as in Example 1.

Embodiment 3

[0028] The chemical composition of 9-12% Cr martensitic heat-resistant steel is: C: 0.15wt.%, Si: 1.23wt.%, Cr: 10.46wt.%, Mn: 0.41wt.%, W: 1.5wt.%. , Ta: 0.15wt.%, V: 0.19wt.%, Nb: 0.014wt.%, and the balance is iron. The metal surface treatment process is the same as in Example 1.

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Abstract

The invention aims at providing a method for improving resistance of martensite heat-resistant steel to liquid metal corrosion. The method is characterized in that an enamel powder layer is sprayed to the surface of the martensite heat-resistant steel, and an enamel coating is prepared after a curing reaction is made. The surface of the martensite heat-resistant steel is treated through the method, the liquid metal corrosion resistance of metal can be effectively improved, and the service life of a metal material is prolonged.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and particularly provides a method for preparing an enamel coating on the surface of martensitic heat-resistant steel to improve its resistance to liquid metal corrosion. Background technique [0002] With the intensification of the energy crisis, it is imminent to develop safe, high energy density, and environment-friendly new energy sources. Nuclear power is an ideal choice to meet these challenges, but the problem of nuclear waste disposal has always restricted the sustainable development of nuclear power. ADS transmutation system (Accelerator Driven sub-critical System) is currently the most promising nuclear waste transmutation system because of its efficient use of nuclear waste and high system security. Liquid lead and liquid lead-bismuth eutectic alloy have become the materials of choice for spallation targets and coolants in ADS transmutation systems due to their superio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23D5/02C23D1/02
Inventor 严伟石全强单以银杨振国王威杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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