Surface treatment method of high-specific-gravity tungsten alloy

Abstract

The invention discloses a surface treatment method of a high-specific-gravity tungsten alloy, which comprises the following steps: firstly, carrying out plasma treatment on the high-specific-gravity tungsten alloy for 10-15 minutes at the treatment power of 350-400 W, and after the treatment is finished, preheating for 1 hour at the temperature of 60-65 DEG C to obtain the preheated high-specific-gravity tungsten alloy; preparing a modified liquid: adding 1-3 parts of a silane coupling agent KH550, 2-4 parts of a sodium stearate agent and 3-5 parts of a modified additive into 5-8 parts of a chitosan solution, and fully stirring to obtain the modified liquid. According to surface treatment of the high-specific-gravity tungsten alloy, the high-specific-gravity tungsten alloy is subjected to plasma treatment and then subjected to ultrasonic modification treatment through a modification solution, a sodium stearate agent in the modification solution is matched with a modification additive and a silane coupling agent KH550, and the acid corrosion resistance stability of a high-specific-gravity tungsten alloy product is optimized through blending and synergistic effects of the raw materials; the acid corrosion stability under different concentration conditions is optimized.

Description

Technical Field

[0001] This invention relates to the field of high-density tungsten alloy processing technology, and more specifically to a surface treatment method for high-density tungsten alloys. Background Technology

[0002] High-density tungsten alloys are alloys composed of tungsten as the base and other elements. Among metals, tungsten has the highest melting point, high-temperature strength, creep resistance, thermal conductivity, electrical conductivity, and electron emission properties. It has a high specific gravity. In addition to being widely used in the manufacture of cemented carbides and as an alloy additive, tungsten and its alloys are widely used in the electronics and electric light source industries. They are also used in aerospace, casting, and weaponry sectors to make rocket nozzles, die-casting molds, armor-piercing projectile cores, contacts, heating elements, and heat shields.

[0003] Existing surface treatment processes for high-density tungsten alloys are simple, making it difficult to optimize the acid corrosion resistance of high-density tungsten alloy products. Furthermore, the poor acid corrosion resistance under different concentration conditions limits the product's efficiency. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the purpose of this invention is to provide a surface treatment method for high-density tungsten alloys to solve the problems mentioned in the background art.

[0005] The present invention solves the technical problem by adopting the following technical solution: This invention provides a surface treatment method for high-density tungsten alloys, comprising the following steps: Step 1: First, plasma treat the high-density tungsten alloy for 10-15 minutes with a treatment power of 350-400W. After treatment, preheat it at 60-65℃ for 1 hour to obtain the preheated high-density tungsten alloy. Step 2: Preparation of modified solution: Add 1-3 parts of silane coupling agent KH550, 2-4 parts of sodium stearate agent and 3-5 parts of modifying additive to 5-8 parts of chitosan solution and stir thoroughly to obtain modified solution; Step 3: Perform ultrasonic modification on the preheated high-density tungsten alloy and the modified liquid at a weight ratio of 2:5. After ultrasonic treatment, filter and dry the mixture.

[0006] Preferably, the ultrasonic power for ultrasonic modification is 350-400W, and the ultrasonic treatment lasts for 1 hour.

[0007] Preferably, the modified additive is prepared by: S01: Add 2-4 parts of kaolin and 1-3 parts of sodium citrate solution with a mass fraction of 5% to 5-8 parts of lanthanum chloride solution and stir thoroughly to obtain kaolin solution; S02: Mix 4-7 parts of carbon nanotubes, 2-3 parts of silicon carbide, 1-3 parts of nano-silica sol and 5-8 parts of sodium dodecylbenzenesulfonate solution, and then perform primary ball milling, followed by filtration and drying to obtain carbon nanotube agent; S03: Carbon nanotube agent and kaolin liquid are mixed at a weight ratio of 2:5 and subjected to two-stage ball milling. After ball milling, the mixture is filtered and dried to obtain the modified additive.

[0008] Preferably, the lanthanum chloride solution has a mass fraction of 2-5%; and the sodium dodecylbenzenesulfonate solution has a mass fraction of 3-4%.

[0009] Preferably, the ball milling speed for the first-stage ball milling process is 100 r / min, and the milling time is 1 h; the ball milling speed for the second-stage ball milling process is 50 r / min, and the milling time is 2 h.

[0010] Preferably, the preparation method of sodium stearate is as follows: S11: Sodium stearate, sodium silicate solution and yttrium oxide are mixed and stirred evenly in a weight ratio of 3:2:1 to obtain modified sodium stearate; S12: Mix 3-5 parts of nano titanium dioxide, 2-3 parts of urea solution and 1-2 parts of silane coupling agent KH560 thoroughly to obtain nano titanium dioxide agent; S13: Nano titanium dioxide agent and modified sodium stearate are stirred in a weight ratio of 2:5, then filtered and dried to obtain sodium stearate agent.

[0011] Preferably, the sodium silicate solution has a mass fraction of 2-5%; the urea solution has a mass fraction of 3-4%.

[0012] Preferably, the stirring temperature is 55-60℃, the stirring speed is 450-500 r / min, and the stirring time is 1 hour.

[0013] Preferably, the chitosan solution has a mass fraction of 2-5%.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The surface treatment of high-density tungsten alloys in this invention involves plasma treatment followed by ultrasonic modification with a modifying solution. The modifying solution contains sodium stearate, modifiers, and silane coupling agent KH550. Through the synergistic effect of the raw materials, the sodium stearate is blended with sodium stearate, sodium silicate solution, and yttrium oxide to optimize the interfacial activity between the raw materials. Simultaneously, nano-titanium dioxide is added for further synergistic effect. Using kaolin as the matrix, a kaolin solution is prepared through the combination of raw materials, along with carbon nanotubes and silicon carbide for further synergistic effect. This optimizes the acid corrosion resistance of the high-density tungsten alloy product and improves its acid corrosion resistance under different concentration conditions. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] This embodiment of a surface treatment method for high-density tungsten alloy includes the following steps: Step 1: First, plasma treat the high-density tungsten alloy for 10-15 minutes with a treatment power of 350-400W. After treatment, preheat it at 60-65℃ for 1 hour to obtain the preheated high-density tungsten alloy. Step 2: Preparation of modified solution: Add 1-3 parts of silane coupling agent KH550, 2-4 parts of sodium stearate agent and 3-5 parts of modifying additive to 5-8 parts of chitosan solution and stir thoroughly to obtain modified solution; Step 3: Perform ultrasonic modification on the preheated high-density tungsten alloy and the modified liquid at a weight ratio of 2:5. After ultrasonic treatment, filter and dry the mixture.

[0017] In this embodiment, the ultrasonic power for ultrasonic modification treatment is 350-400W, and the ultrasonic treatment lasts for 1 hour.

[0018] The preparation method of the modified additive in this embodiment is as follows: S01: Add 2-4 parts of kaolin and 1-3 parts of sodium citrate solution with a mass fraction of 5% to 5-8 parts of lanthanum chloride solution and stir thoroughly to obtain kaolin solution; S02: Mix 4-7 parts of carbon nanotubes, 2-3 parts of silicon carbide, 1-3 parts of nano-silica sol and 5-8 parts of sodium dodecylbenzenesulfonate solution, and then perform primary ball milling, followed by filtration and drying to obtain carbon nanotube agent; S03: Carbon nanotube agent and kaolin liquid are mixed at a weight ratio of 2:5 and subjected to two-stage ball milling. After ball milling, the mixture is filtered and dried to obtain the modified additive.

[0019] In this embodiment, the lanthanum chloride solution has a mass fraction of 2-5%; the sodium dodecylbenzenesulfonate solution has a mass fraction of 3-4%.

[0020] In this embodiment, the ball milling speed for the first-stage ball milling process is 100 r / min, and the ball milling time is 1 hour; the ball milling speed for the second-stage ball milling process is 50 r / min, and the ball milling time is 2 hours.

[0021] The preparation method of sodium stearate in this embodiment is as follows: S11: Sodium stearate, sodium silicate solution and yttrium oxide are mixed and stirred evenly in a weight ratio of 3:2:1 to obtain modified sodium stearate; S12: Mix 3-5 parts of nano titanium dioxide, 2-3 parts of urea solution and 1-2 parts of silane coupling agent KH560 thoroughly to obtain nano titanium dioxide agent; S13: Nano titanium dioxide agent and modified sodium stearate are stirred in a weight ratio of 2:5, then filtered and dried to obtain sodium stearate agent.

[0022] In this embodiment, the sodium silicate solution has a mass fraction of 2-5%; the urea solution has a mass fraction of 3-4%.

[0023] In this embodiment, the stirring temperature is 55-60℃, the stirring speed is 450-500 r / min, and the stirring time is 1 hour.

[0024] The chitosan solution in this embodiment has a mass fraction of 2-5%.

[0025] Example 1. This embodiment of a surface treatment method for high-density tungsten alloy includes the following steps: Step 1: First, plasma treat the high-density tungsten alloy for 10 minutes at a power of 350W. After treatment, preheat it at 60℃ for 1 hour to obtain the preheated high-density tungsten alloy. Step 2: Preparation of modified solution: Add 1 part of silane coupling agent KH550, 2 parts of sodium stearate agent and 3 parts of modifying additive to 5 parts of chitosan solution and stir thoroughly to obtain modified solution. Step 3: Perform ultrasonic modification on the preheated high-density tungsten alloy and the modified liquid at a weight ratio of 2:5. After ultrasonic treatment, filter and dry the mixture.

[0026] In this embodiment, the ultrasonic power for ultrasonic modification treatment is 350W, and the ultrasonic treatment lasts for 1 hour.

[0027] The preparation method of the modified additive in this embodiment is as follows: S01: Add 2 parts of kaolin and 1 part of sodium citrate solution with a mass fraction of 5% to 5 parts of lanthanum chloride solution and stir thoroughly to obtain kaolin solution; S02: 4 parts carbon nanotubes, 2 parts silicon carbide, 1 part nano silica sol and 5 parts sodium dodecylbenzenesulfonate solution are mixed and ball-milled, then filtered and dried to obtain carbon nanotube agent; S03: Carbon nanotube agent and kaolin liquid are mixed at a weight ratio of 2:5 and subjected to two-stage ball milling. After ball milling, the mixture is filtered and dried to obtain the modified additive.

[0028] In this embodiment, the lanthanum chloride solution has a mass fraction of 2%; the sodium dodecylbenzenesulfonate solution has a mass fraction of 3%.

[0029] In this embodiment, the ball milling speed for the first-stage ball milling process is 100 r / min, and the ball milling time is 1 hour; the ball milling speed for the second-stage ball milling process is 50 r / min, and the ball milling time is 2 hours.

[0030] The preparation method of sodium stearate in this embodiment is as follows: S11: Sodium stearate, sodium silicate solution and yttrium oxide are mixed and stirred evenly in a weight ratio of 3:2:1 to obtain modified sodium stearate; S12: Mix 3 parts of nano titanium dioxide, 2 parts of urea solution and 1 part of silane coupling agent KH560 thoroughly to obtain nano titanium dioxide agent; S13: Nano titanium dioxide agent and modified sodium stearate are stirred in a weight ratio of 2:5, then filtered and dried to obtain sodium stearate agent.

[0031] In this embodiment, the sodium silicate solution has a mass fraction of 2%; the urea solution has a mass fraction of 3%.

[0032] In this embodiment, the stirring temperature is 55℃, the stirring speed is 450r / min, and the stirring time is 1h.

[0033] The chitosan solution in this embodiment has a mass fraction of 2%.

[0034] Example 2. This embodiment of a surface treatment method for high-density tungsten alloy includes the following steps: Step 1: First, plasma treat the high-density tungsten alloy for 15 minutes at a power of 400W. After treatment, preheat it at 65℃ for 1 hour to obtain the preheated high-density tungsten alloy. Step 2: Preparation of modified solution: Add 3 parts of silane coupling agent KH550, 4 parts of sodium stearate agent and 5 parts of modifying additive to 8 parts of chitosan solution and stir thoroughly to obtain modified solution. Step 3: Perform ultrasonic modification on the preheated high-density tungsten alloy and the modified liquid at a weight ratio of 2:5. After ultrasonic treatment, filter and dry the mixture.

[0035] In this embodiment, the ultrasonic power for ultrasonic modification treatment is 400W, and the ultrasonic treatment lasts for 1 hour.

[0036] The preparation method of the modified additive in this embodiment is as follows: S01: Add 4 parts of kaolin and 3 parts of 5% sodium citrate solution to 8 parts of lanthanum chloride solution and stir thoroughly to obtain kaolin solution; S02: 7 parts carbon nanotubes, 3 parts silicon carbide, 3 parts nano-silica sol and 8 parts sodium dodecylbenzenesulfonate solution are mixed and ball-milled, then filtered and dried to obtain carbon nanotube agent; S03: Carbon nanotube agent and kaolin liquid are mixed at a weight ratio of 2:5 and subjected to two-stage ball milling. After ball milling, the mixture is filtered and dried to obtain the modified additive.

[0037] In this embodiment, the lanthanum chloride solution has a mass fraction of 5%; the sodium dodecylbenzenesulfonate solution has a mass fraction of 4%.

[0038] In this embodiment, the ball milling speed for the first-stage ball milling process is 100 r / min, and the ball milling time is 1 hour; the ball milling speed for the second-stage ball milling process is 50 r / min, and the ball milling time is 2 hours.

[0039] The preparation method of sodium stearate in this embodiment is as follows: S11: Sodium stearate, sodium silicate solution and yttrium oxide are mixed and stirred evenly in a weight ratio of 3:2:1 to obtain modified sodium stearate; S12: 5 parts of nano titanium dioxide, 3 parts of urea solution and 2 parts of silane coupling agent KH560 are thoroughly mixed to obtain nano titanium dioxide agent; S13: Nano titanium dioxide agent and modified sodium stearate are stirred in a weight ratio of 2:5, then filtered and dried to obtain sodium stearate agent.

[0040] In this embodiment, the sodium silicate solution has a mass fraction of 5%; the urea solution has a mass fraction of 4%.

[0041] In this embodiment, the stirring temperature is 60℃, the stirring speed is 500r / min, and the stirring time is 1h.

[0042] The chitosan solution in this embodiment has a mass fraction of 5%.

[0043] Example 3. This embodiment of a surface treatment method for high-density tungsten alloy includes the following steps: Step 1: The high-density tungsten alloy is first plasma-treated for 12.5 min at a power of 375 W. After treatment, it is preheated at 62.5℃ for 1 h to obtain the preheated high-density tungsten alloy. Step 2: Preparation of modified solution: Add 2 parts of silane coupling agent KH550, 3 parts of sodium stearate agent and 4 parts of modifying additive to 6.5 parts of chitosan solution and stir thoroughly to obtain modified solution; Step 3: Perform ultrasonic modification on the preheated high-density tungsten alloy and the modified liquid at a weight ratio of 2:5. After ultrasonic treatment, filter and dry the mixture.

[0044] In this embodiment, the ultrasonic power for ultrasonic modification treatment is 375W, and the ultrasonic treatment lasts for 1 hour.

[0045] The preparation method of the modified additive in this embodiment is as follows: S01: Add 3 parts of kaolin and 2 parts of 5% sodium citrate solution to 6.5 parts of lanthanum chloride solution and stir thoroughly to obtain kaolin solution; S02: 5.5 parts carbon nanotubes, 2.5 parts silicon carbide, 2 parts nano-silica sol and 6.5 parts sodium dodecylbenzenesulfonate solution were mixed and ball-milled, then filtered and dried to obtain carbon nanotube agent; S03: Carbon nanotube agent and kaolin liquid are mixed at a weight ratio of 2:5 and subjected to two-stage ball milling. After ball milling, the mixture is filtered and dried to obtain the modified additive.

[0046] In this embodiment, the lanthanum chloride solution has a mass fraction of 3.5%; the sodium dodecylbenzenesulfonate solution has a mass fraction of 3.5%.

[0047] In this embodiment, the ball milling speed for the first-stage ball milling process is 100 r / min, and the ball milling time is 1 hour; the ball milling speed for the second-stage ball milling process is 50 r / min, and the ball milling time is 2 hours.

[0048] The preparation method of sodium stearate in this embodiment is as follows: S11: Sodium stearate, sodium silicate solution and yttrium oxide are mixed and stirred evenly in a weight ratio of 3:2:1 to obtain modified sodium stearate; S12: 4 parts of nano titanium dioxide, 2.5 parts of urea solution and 1.5 parts of silane coupling agent KH560 are mixed thoroughly to obtain nano titanium dioxide agent; S13: Nano titanium dioxide agent and modified sodium stearate are stirred in a weight ratio of 2:5, then filtered and dried to obtain sodium stearate agent.

[0049] In this embodiment, the sodium silicate solution has a mass fraction of 3.5%; the urea solution has a mass fraction of 3.5%.

[0050] In this embodiment, the stirring temperature is 55℃, the stirring speed is 470r / min, and the stirring time is 1h.

[0051] The chitosan solution in this embodiment has a mass fraction of 3.5%.

[0052] Comparative Example 1. Unlike Example 3, no modified liquid treatment was used.

[0053] Comparative Example 2. Unlike Example 3, no modifying additives were added to the modified liquid.

[0054] Comparative Example 3. Unlike Example 3, no carbon nanotube agent was added to the modified additive.

[0055] Comparative Example 4. Unlike Example 3, no kaolin liquid was added to the modified additive.

[0056] Comparative Example 5. Unlike Example 3, sodium stearate was not added.

[0057] Comparative Example 6. Unlike Example 3, sodium stearate is used instead of sodium stearate.

[0058] The product performance tests for Examples 1-3 and Comparative Examples 1-6 are as follows:

[0059] As can be seen from Comparative Examples 1-6 and Example 3, the product of Example 3 has excellent color properties, and the product's performance stability is significantly improved under conditions of 2% hydrochloric acid mist and 8% hydrochloric acid mist. The performance of the product deteriorates significantly when no modified liquid treatment is used in the modified liquid, or when no carbon nanotube agent, kaolin liquid, or sodium stearate agent is added to the modified liquid, or when sodium stearate is used instead of sodium stearate. The modified liquid obtained by the specific method of this invention has the most significant performance effect, and the effect of other methods is not as obvious as that of this invention.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A surface treatment method for high-density tungsten alloys, characterized in that, Includes the following steps: Step 1: First, plasma treat the high-density tungsten alloy for 10-15 minutes with a treatment power of 350-400W. After treatment, preheat it at 60-65℃ for 1 hour to obtain the preheated high-density tungsten alloy. Step 2: Preparation of modified solution: Add 1-3 parts of silane coupling agent KH550, 2-4 parts of sodium stearate agent and 3-5 parts of modifying additive to 5-8 parts of chitosan solution and stir thoroughly to obtain modified solution; Step 3: Perform ultrasonic modification on the preheated high-density tungsten alloy and the modified liquid at a weight ratio of 2:

5. After ultrasonic treatment, filter and dry the mixture.

2. The surface treatment method for a high-density tungsten alloy according to claim 1, characterized in that, The ultrasonic power for ultrasonic modification treatment is 350-400W, and the ultrasonic treatment lasts for 1 hour.

3. The surface treatment method for a high-density tungsten alloy according to claim 1, characterized in that, The preparation method of the modified additive is as follows: S01: Add 2-4 parts of kaolin and 1-3 parts of sodium citrate solution with a mass fraction of 5% to 5-8 parts of lanthanum chloride solution and stir thoroughly to obtain kaolin solution; S02: Mix 4-7 parts of carbon nanotubes, 2-3 parts of silicon carbide, 1-3 parts of nano-silica sol and 5-8 parts of sodium dodecylbenzenesulfonate solution, and then perform primary ball milling, followed by filtration and drying to obtain carbon nanotube agent; S03: Carbon nanotube agent and kaolin liquid are mixed at a weight ratio of 2:5 and subjected to two-stage ball milling. After ball milling, the mixture is filtered and dried to obtain the modified additive.

4. The surface treatment method for a high-density tungsten alloy according to claim 3, characterized in that, The lanthanum chloride solution has a mass fraction of 2-5%; the sodium dodecylbenzenesulfonate solution has a mass fraction of 3-4%.

5. The surface treatment method for a high-density tungsten alloy according to claim 3, characterized in that, The ball milling process for the first stage was carried out at a speed of 100 r / min for 1 hour; the ball milling process for the second stage was carried out at a speed of 50 r / min for 2 hours.

6. The surface treatment method for a high-density tungsten alloy according to claim 1, characterized in that, The preparation method of sodium stearate is as follows: S11: Sodium stearate, sodium silicate solution and yttrium oxide are mixed and stirred evenly in a weight ratio of 3:2:1 to obtain modified sodium stearate; S12: Mix 3-5 parts of nano titanium dioxide, 2-3 parts of urea solution and 1-2 parts of silane coupling agent KH560 thoroughly to obtain nano titanium dioxide agent; S13: Nano titanium dioxide agent and modified sodium stearate are stirred in a weight ratio of 2:5, then filtered and dried to obtain sodium stearate agent.

7. The surface treatment method for a high-density tungsten alloy according to claim 6, characterized in that, The sodium silicate solution has a mass fraction of 2-5%; the urea solution has a mass fraction of 3-4%.

8. The surface treatment method for a high-density tungsten alloy according to claim 6, characterized in that, The stirring temperature for the stirring treatment is 55-60℃, the stirring speed is 450-500r / min, and the stirring time is 1h.

9. The surface treatment method for a high-density tungsten alloy according to claim 1, characterized in that, The chitosan solution has a mass fraction of 2-5%.

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