A kind of anti-water corrosion refractory metal molybdenum surface treatment method

Abstract

The invention discloses a water corrosion-resistant refractory metal molybdenum surface treatment method, which includes preparing molybdenum powder, pressing and forming, sintering, thermal processing and heat treatment, preparing experimental samples and ion irradiation, and adopting the method of maintaining the vacuum degree in the sample irradiation cavity , the surface of the sample is irradiated with Ar ions at a set temperature, and the selected dose is 3‑4*10 16 ion / cm 2 , the acceleration voltage is 350-400KeV, the average atomic dislocation energy is 25-35eV, and the surface-treated molybdenum block is obtained. The corrosion resistance of the samples before and after irradiation was evaluated by electrochemical open circuit potential, polarization curve and impedance tests. The refractory metal molybdenum treated by the method has good corrosion resistance and greatly improves the failure life of the molybdenum in the water medium. By studying and analyzing the effect of neutron irradiation on corrosion, scientific data are provided 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...

Examples

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...

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...

Examples

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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