Surface treatment method for water-corrosion-resistant refractory metal molybdenum

A technology for surface treatment and refractory metal, applied in the field of molybdenum surface treatment of refractory metal that is resistant to water corrosion, to achieve the effects of good uniformity, increased density, and avoidance of interface effects

Active Publication Date: 2020-07-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology does not introduce other elements into the molybdenum matrix to affect the inherent good mechanical properties of the matrix, and avoids the problems of interface effects or poor bonding strength caused by traditional coatings. By changing the crystal structure of the surface nano-layer behavior, changing its electrochemical corrosion behavior

Method used

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  • Surface treatment method for water-corrosion-resistant refractory metal molybdenum
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  • Surface treatment method for water-corrosion-resistant refractory metal molybdenum

Examples

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Effect test

Embodiment 1

[0058] Roasted molybdenite (MoS 2 ) to obtain molybdenum trioxide mixed with impurities, and the mixture of ammonia solution and molybdenum trioxide is dissolved, separated and purified to obtain ammonium molybdate solution. Decompose the ammonium molybdate solution at 500°C to obtain molybdenum trioxide, and then reduce it twice in an ammonia atmosphere to obtain pure molybdenum powder. The pure molybdenum powder is uniaxially cold-pressed to obtain a pressed sheet. The pressed blank was pressureless sintered in a hydrogen atmosphere at a sintering temperature of 1960°C and kept for 6 hours. The molybdenum plate was rolled at 1350°C, held in a hydrogen atmosphere for 10 minutes, and double-rolled in the air. After rolling, the final thickness of the plate was 3mm. The specific impurity concentration in the prepared molybdenum plate was shown in Table 1. Show. Heat treatment at an annealing temperature of 1100°C for 40 minutes. Cut the molybdenum plate into a 10x10x3mm squ...

Embodiment 2

[0060] Roasted molybdenite (MoS 2 ) to obtain molybdenum trioxide mixed with impurities, and the mixture of ammonia solution and molybdenum trioxide is dissolved, separated and purified to obtain ammonium molybdate solution. Decompose the ammonium molybdate solution at 450°C to obtain molybdenum trioxide, and then reduce it twice in an ammonia atmosphere to obtain pure molybdenum powder. The pure molybdenum powder is uniaxially cold-pressed to obtain a pressed sheet. The pressed blank was pressureless sintered in a hydrogen atmosphere at a sintering temperature of 1960°C and kept for 6 hours. The molybdenum plate was rolled at 1350°C, held in a hydrogen atmosphere for 10 minutes, and double-rolled in the air. After rolling, the final thickness of the plate was 3mm. The specific impurity concentration in the prepared molybdenum plate was shown in Table 1. Show. Heat treatment at an annealing temperature of 1000°C for 50 min. Cut the molybdenum plate into a 10x10x3mm square ...

Embodiment 3

[0062] Roasted molybdenite (MoS 2 ) to obtain molybdenum trioxide mixed with impurities, and the mixture of ammonia solution and molybdenum trioxide is dissolved, separated and purified to obtain ammonium molybdate solution. Decompose the ammonium molybdate solution at 460°C to obtain molybdenum trioxide, and then reduce it twice in an ammonia atmosphere to obtain pure molybdenum powder. The pure molybdenum powder is uniaxially cold-pressed to obtain a pressed sheet. The pressed blank was pressureless sintered in a hydrogen atmosphere at a sintering temperature of 1960°C and kept for 6 hours. The molybdenum plate was rolled at 1350°C, held in a hydrogen atmosphere for 10 minutes, and double-rolled in the air. After rolling, the final thickness of the plate was 3mm. The specific impurity concentration in the prepared molybdenum plate was shown in Table 1. Show. Heat treatment at an annealing temperature of 850°C for 60 min. Cut the molybdenum plate into a 10x10x3mm square s...

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Abstract

The invention discloses a surface treatment method for water-corrosion-resistant refractory metal molybdenum. The method includes the steps that molybdenum powder is prepared, press forming is carriedout, sintering is carried out, heat machining and heat treatment are carried out, an experimental sample is prepared, and ion irradiation is carried out. The vacuum degree in a sample irradiation cavity is kept, Ar ions are adopted for irradiating the surface of the sample at a set temperature, the dosage is selected at 3-4*1016 ion / cm<2>, the acceleration voltage is selected at 350-400 KeV, theaverage atom displacement energy is selected at 25-35 eV, and a molybdenum block obtained after surface treatment is obtained. The corrosion resistance of the sample obtained before and after irradiation is evaluated through electrochemical open circuit potential, a polarization curve, impedance and other tests. The refractory metal molybdenum treated with the method has good corrosion resistance,and the burn-out life of the molybdenum in a water medium is greatly prolonged. By researching and analyzing the influences of the neutron irradiation effect on corrosion, scientific data are provided for application of the molybdenum and alloys thereof in the nuclear power field.

Description

technical field [0001] The invention relates to a water corrosion-resistant alloy surface treatment method, in particular to a water corrosion-resistant refractory metal molybdenum surface treatment method. Background technique [0002] Molybdenum, as one of the rare metals with important strategic significance in the new generation, has a melting point as high as 2625°C, and has the advantages of excellent high-temperature strength, electrical and thermal conductivity, high-temperature creep resistance and low thermal expansion coefficient. Bismuth has good corrosion resistance, so it is widely used in many fields such as metallurgy, petroleum, chemical industry, machinery, aerospace, iron and steel industry, nuclear energy technology and so on. With the continuous promotion of the application field of molybdenum and molybdenum alloys, molybdenum and molybdenum alloys are widely used in special environments such as high temperature, high pressure, and strong corrosion. Thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26B22F3/16B22F3/24C22F1/18C22F3/00
CPCB22F3/16B22F3/24B22F9/26B22F2998/10B22F2999/00C22F1/02C22F1/18C22F3/00B22F3/02B22F3/1007B22F2003/185B22F2003/248B22F2003/247B22F2201/013
Inventor 丁向东万徳才让薛德祯马胜强孙院军杨贺杰曾毅
Owner XI AN JIAOTONG UNIV
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