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A surface alloying method to improve the water corrosion resistance of refractory metal molybdenum

A technology of surface alloying and refractory metal, which is applied in the field of surface treatment of refractory metal molybdenum which is resistant to water corrosion, and achieves the effect of avoiding interface effect, good uniformity and improving passivation performance.

Active Publication Date: 2022-01-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Without affecting the mechanical properties of the molybdenum matrix, the invention avoids the problems of interface effects or poor bonding strength caused by traditional coatings, and changes its electrochemical corrosion by changing the crystal structure and other organizational behaviors of the surface nano-layers. Behavior

Method used

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  • A surface alloying method to improve the water corrosion resistance of refractory metal molybdenum
  • A surface alloying method to improve the water corrosion resistance of refractory metal molybdenum
  • A surface alloying method to improve the water corrosion resistance of refractory metal molybdenum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Through the traditional powder metallurgy method, the 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 forging, the final plate thickness was 5mm. The specific impurity concentration in the prepared molybdenum plate was shown in Table 1. .

[0057] Cut the molybdenum plate into 15x15x3mm square samples by wire ...

Embodiment 2

[0059] Through the traditional powder metallurgy method, the 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 forging, the final plate thickness was 4mm. The specific impurity concentration in the prepared molybdenum plate is shown in Table 1. .

[0060] Cut the molybdenum plate into a 10x10x3mm square sample by a wir...

Embodiment 3

[0062] Through the traditional powder metallurgy method, the 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 forging, the final plate thickness was 4mm. The specific impurity concentration in the prepared molybdenum plate is shown in Table 1. .

[0063] Cut the molybdenum plate into 10x10x2mm square samples by wire c...

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Abstract

The invention discloses a surface alloying method for improving the water corrosion resistance of refractory metal molybdenum, which is divided into two parts: preparation of experimental samples and ion irradiation. The irradiation experimental samples are prepared by powder metallurgy method, and the samples are placed in a high vacuum In the irradiation chamber, the surface of the sample is irradiated with Nb ions at 30‑100 °C, and the selected dose is 2‑4*10 16 ion / cm 2 , the acceleration voltage is 300-400KeV, and the average atomic dislocation energy is 25-35eV, and the molybdenum sample with surface alloying is obtained. The surface alloyed samples were tested by XRD, microhardness, electrochemical dynamic polarization, and impedance tests to detect and evaluate the phase, mechanical properties, and corrosion resistance before and after irradiation. The refractory metal molybdenum treated by this method has good corrosion resistance, greatly improves the failure life of molybdenum in high-temperature water medium, and provides scientific guidance for the application of molybdenum and its alloys in the field of nuclear power .

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 Patents(China)
IPC IPC(8): C22F3/00C23F1/38C22C27/04
CPCC22F3/00C23F1/38C22C27/04
Inventor 薛德祯万徳才让丁向东张建孙院军李天宇陈灿
Owner XI AN JIAOTONG UNIV
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