CN-119956288-B - Production method of screw spike with composite amorphous structure protective layer

Abstract

The application discloses a production method of a spiral spike with a composite amorphous structure protective layer, which comprises the steps of (1) carrying out oil removal, cleaning and sand blasting treatment on a spike body to obtain a clean spike body, wherein the spike body is provided with external threads formed by rolling, (2) spraying, namely spraying zirconium-based amorphous powder on the surface of the spike body by adopting a plasma spraying method to form an amorphous coating, cooling to normal temperature, rolling, namely heating the spike body provided with the amorphous coating and rolling, repeating spraying and rolling for 3-5 times to obtain a coated spike, and (3) heating the coated spike to 430-450 ℃ in nitrogen atmosphere, and cooling to the room temperature after the temperature is kept for a set time. According to the application, the amorphous coating is heated, so that part of the structure is formed into nano crystals, the amorphous state and the nano crystal interface exist, the diffusion of passivation elements can be promoted, the formation of a passivation film is accelerated, the electrochemical activity is reduced, the plasticity of the coating is improved, and the corrosion resistance of the amorphous alloy is improved.

Inventors

• SHI HONGQI
• LI XINXING
• ZHAN JIANMING
• SUN HU
• HU ZHIQIANG
• XUAN YAN
• LIANG GUANGXIAN
• Jian Qinhui
• Su tenglong

Assignees

• 宿迁学院

Dates

Publication Date

20260508

Application Date

20250212

Claims (5)

1. 1. A method for producing a screw spike with a composite amorphous structure protective layer, which is characterized by comprising the following steps: (1) Carrying out oil removal, cleaning and sand blasting treatment on the spike body, wherein the spike body is made of carbon steel materials to obtain a clean spike body, and the spike body is provided with external threads formed by adopting a rolling mode; (2) Using zirconium-based amorphous powder as a spraying material, and adopting a plasma spraying method to spray on the surface of the spike body to form an amorphous coating, so as to prepare a coated spike; The amorphous coating consists of 3-5 sub-coatings, and each sub-coating is formed by the following steps: Spraying, namely spraying zirconium-based amorphous powder serving as a spraying material on the surface of the spike body by adopting a plasma spraying method to form a sub-coating, cooling to normal temperature, wherein the thickness of the sub-coating is 100-150 mu m; Rolling, namely heating the spike body carrying the split coating to 390-400 ℃ at the heating speed of 7-9 ℃ per min, and rolling the split coating, wherein when the split coating is rolled, a thread rolling die is the same as a thread rolling die for forming external threads on the spike body; Repeatedly spraying and rolling for 3-5 times to prepare a coating spike; (3) Heating the coating spike to 430-450 ℃ at a set heating speed under nitrogen atmosphere, cooling to room temperature after preserving heat for a set time, and preserving heat for 25-50min at a set heating speed of 7-9 ℃ per minute.
2. 2. The production method according to claim 1, wherein the zirconium-based amorphous powder comprises, by mass, 50 to 54% of Zr,24 to 28% of Cu,7 to 9% of Al,3 to 4% of Ti and 7 to 10% of Ni.
3. 3. The method according to claim 1, wherein in the step (2), the parameters of plasma spraying are that the flow rate of argon is 40-70L/min, the flow rate of hydrogen is 10-25L/min, the current is 300-450A, the voltage is 40-50V, the spraying distance is 40-110mm, the powder feeding rate is 15-30g/min, and the moving speed of the spray gun is 10-40mm/s.
4. 4. The production method according to claim 1, wherein the spike body is fixed on a rotary table, and the rotation speed of the rotary table is 100-200r/min.
5. 5. The method according to claim 1, wherein the amorphous coating has a thickness of 400-600 μm.

Description

Production method of screw spike with composite amorphous structure protective layer Technical Field The invention relates to a production method of a screw spike with a composite amorphous structure protective layer. Background The rail is fixed on the sleeper by adopting the screw spike, and the screw spike is continuously influenced by rainwater, the discharge of train waste water, and the influence of chemical industry, minerals and the like lost in the transportation process because the screw spike is in the atmospheric environment for a long time, so that the rail is severely corroded. Therefore, it is necessary to improve the corrosion resistance of the screw spike. Disclosure of Invention In order to improve the corrosion resistance of the screw spike, the application provides a production method of the screw spike with a composite amorphous structure protection layer, which is characterized by comprising the following steps of: (1) Carrying out oil removal, cleaning and sand blasting treatment on the spike body, wherein the spike body is made of carbon steel materials to obtain a clean spike body, and the spike body is provided with external threads formed by adopting a rolling mode; (2) Spraying, namely spraying zirconium-based amorphous powder serving as a spraying material on the surface of the spike body by adopting a plasma spraying method to form an amorphous coating, and cooling to normal temperature; Rolling, namely heating the spike body carrying the amorphous coating to 390-400 ℃, rolling the amorphous coating, wherein when rolling the amorphous coating, a thread rolling die is the same as a thread rolling die for forming external threads on the spike body; Repeatedly spraying and rolling for 3-5 times to prepare a coating spike; (3) The coated spikes were heated to 430-450 ℃ at a set heating rate under nitrogen atmosphere and cooled to room temperature after a set time of incubation. Specifically, the amorphous coating has a thickness of 400-600 μm. During degreasing and cleaning, acetone is adopted for soaking for 20-50min, then absolute ethyl alcohol is used for ultrasonic cleaning for 30-50min, and finally drying is carried out at 40-90 ℃, and during sand blasting, the sand blasting pressure is 0.5-0.7MPa. The amorphous alloy has a single uniform solid phase chemical structure, common structural defects in crystal structures such as grain boundaries, dislocation, stacking faults and twins do not exist, and component segregation and second phase precipitation do not exist, so that the amorphous alloy does not have intergranular corrosion, elements with strong passivation capability in the amorphous alloy, such as Fe, cr, ni, co, mo, ta, nb and elements with strong passivation capability, such as W, are used, a passivation film is easy to form on the surface of the amorphous alloy, and the amorphous alloy coating has strong corrosion resistance, so that the corrosion resistance of the screw spike is improved. The rail is pressed on the sleeper by means of the spring fastener, the spring fastener is pressed by the screw spike, the screw spike is anchored on the sleeper and is formed into a whole with the sleeper, and when the train passes at high speed, strong pressure, friction force and elastic vibration force are generated on the rail, so that the screw spike is subjected to static tensile stress and cyclic stress when the train passes. After the amorphous alloy coating is formed on the surface of the screw spike, cyclic stress can be generated on the amorphous alloy coating due to the meshing effect of the screw threads, and the amorphous alloy is easy to generate shearing deformation under the pressure of the screw threads to generate quasi-brittle fracture formation due to weak plasticity of the amorphous alloy, so that cracks are generated on the amorphous alloy coating, and corrosive substances can corrode the spike body through the cracks. In the application, the amorphous coating is heated at 430-450 ℃, the temperature is below the glass transition temperature of the zirconium-based amorphous alloy, and in the heat preservation process, part of the structure of the amorphous alloy is formed into Zr 2 Cu and Zr 2 Ni crystalline phases, and the amorphous phase and the nanocrystalline interface exist, so that the diffusion of passivation elements can be promoted, the formation of a passivation film can be accelerated, and the corrosion resistance of the amorphous alloy can be improved. Meanwhile, when the amorphous coating is heated and insulated, the free volume of the amorphous alloy is annihilated, the interatomic distance and chemical potential are reduced, the structure is relaxed, the metal atoms are in a low-energy-level state, the electrochemical activity is reduced, and the amorphous alloy is not easy to generate corrosion reaction, so that the corrosion resistance of the amorphous alloy is improved. In the heating and heat preserving process, part of amorphous structure