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Method for improving liquid metal corrosion resistance of heat-resistant steel

A liquid metal and heat-resistant steel technology, applied in metal material coating process, solid diffusion coating, coating and other directions, can solve the problems of difficult oxide film coating, large difference in thermal expansion coefficient, etc., to improve the resistance to liquid metal Corrosion performance, improved bonding force, and the effect of prolonging service life

Inactive Publication Date: 2019-10-22
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

However, due to the large difference in thermal expansion coefficient between the oxide and the metal substrate, it is extremely difficult to prepare a continuous and dense oxide film coating on the metal substrate.

Method used

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  • Method for improving liquid metal corrosion resistance of heat-resistant steel
  • Method for improving liquid metal corrosion resistance of heat-resistant steel
  • Method for improving liquid metal corrosion resistance of heat-resistant steel

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In this embodiment, the method for improving the corrosion resistance of heat-resistant steel to liquid metal is as follows:

[0030] (1) Pretreatment of the metal surface: Polish the metal sample with a size of 15mm×10mm×2mm to 2000# step by step with metallographic sandpaper, and round all the edges and corners, and then use a particle size of W2.5 Polished with water-soluble diamond paste, cleaned by acetone and alcohol, ultrasonically cleaned in deionized water, and dried.

[0031] (2) Formation of a continuous and dense oxide film: put the dried metal sample into a crucible, carry out high-temperature oxidation in an air furnace at 700°C for 50 hours, and then take it out.

[0032] The above-mentioned metal material is 9-12% Cr heat-resistant steel, and its specific chemical composition is: C: 0.18wt.%, Si: 1.21wt.%, Cr: 10.57wt.%, Mn: 0.42wt.%, W: 1.29wt. .%, Ta: 0.14wt.%, V: 0.20wt.%, Nb: 0.001wt.%, and the balance is iron.

[0033] Such as figure 1 with fig...

Embodiment 2

[0035] In this embodiment, the chemical composition of 9-12% Cr martensitic heat-resistant steel is: C: 0.25wt.%, Si: 1.43wt.%, Cr: 10.85wt.%, Mn: 0.54wt.%, W : 1.21wt.%, Ta: 0.11wt.%, V: 0.19wt.%, and the balance is iron. The other surface treatment process of the metal is the same as that of Example 1, but the high temperature oxidation temperature is 800° C., and the oxidation time is 300 h. There is a 70 μm thick decarburization layer between the oxide film and the substrate, see image 3 .

Embodiment 3

[0037]In this embodiment, the chemical composition of 9-12% Cr martensitic heat-resistant steel is: C: 0.085wt.%, Si: 0.26wt.%, Cr: 8.60wt.%, Mn: 0.46wt.%, W : 0.04wt.%, Ta: 0.01wt.%, V: 0.20wt.%, Nb: 0.04wt.%, and the balance is iron. The surface treatment process of this metal is the same as that of Example 1, but the high temperature oxidation temperature is 550° C., and the oxidation time is 100 h.

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Abstract

The invention belongs to the technical field of metal surface treatment, and particularly provides a method for improving liquid metal corrosion resistance of heat-resistant steel by pre-oxidizing a metal surface to form an oxide film improving material. According to the method, after a period of time of oxidation at the high temperature of 550-800 DEG C, a continuous compact oxide film is formedon the surface of the heat-resistant steel, so that the liquid metal corrosion resistance of the metal can be effectively improved, and the service life of the metal material is prolonged. A high-temperature oxidation method is adopted to pre-oxidize the surface of the heat-resistant steel to generate a continuous compact oxide film, a relatively soft decarburization layer exists between the oxidefilm and a substrate to be kept adhered to the oxide film, so that the adhesion effect of a decarburization layer on the surface layer of the metal and the oxide film is played, the traditional method of directly preparing an oxide coating on the surface of the metal is avoided, the adhesion force between the coating and the metal substrate is effectively improved, the possibility of peeling offthe coating and the metal substrate is reduced, and the technical problem of restricting the development of the coating is solved.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular provides a method for improving the corrosion resistance of heat-resistant steel to liquid metal by pre-oxidizing the metal surface to form an oxide film to improve materials. Background technique [0002] The development of the economy and the improvement of living standards are inseparable from the increase in energy demand. With the gradual depletion of traditional oil and coal and the deterioration of the living environment, it is imminent to develop new energy sources that are safe, high in energy density, and environmentally friendly. As a green, safe, clean, reliable, low-carbon and high-efficiency energy, nuclear power has been accepted internationally. The disposal of nuclear waste has always been a worldwide problem for countries with nuclear energy development, and it also restricts the sustainable development of nuclear power. The ADS transmutation sy...

Claims

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Application Information

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IPC IPC(8): C23C8/14C22C38/02C22C38/34C22C38/22C22C38/04C22C38/38C22C38/24C22C38/26
CPCC22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/34C22C38/38C23C8/14
Inventor 石全强李艳芬严伟史显波单以银
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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