Preparation method of hot-dip pure zinc-titanium plate

Abstract

The invention discloses a preparation method of a hot-dip plated pure zinc titanium plate, and belongs to the technical field of hot-dip plated zinc titanium plates. The method comprises the following steps: polishing a titanium plate, treating the titanium plate with an acid solution for 10-20 seconds, cleaning the titanium plate with ethanol, and blow-drying the titanium plate for later use; and the treated titanium plate is immersed in the molten zinc bath liquid for 10-15 s and then taken out of the zinc bath, the titanium plate is naturally cooled to the room temperature, and the galvanized coating is formed. According to the method, the advantages of no magnetism, corrosion resistance and biocompatibility of titanium and zinc are fully exerted, the thermal conductivity and the electrical conductivity of titanium are improved through zinc, pure zinc is hot-dipped on a pure titanium plate, and a novel zinc-plated material is formed and can be used as a shielding material, a corrosion-resistant material, a medical material and the like; the method is widely applied to the fields of petrochemical engineering, ocean engineering, medical materials and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of hot-dip galvanized titanium plates, and particularly relates to a preparation method of a hot-dip pure zinc titanium plate. Background Art

[0002] Metal composite plates are composite materials formed by metallurgically bonding metals with different properties at the interface using various composite technologies. Through appropriate material selection and reasonable structural design, metal composite plates can greatly improve the thermal expansion, strength, toughness, wear resistance, corrosion resistance, electrical properties, magnetic properties and many other properties of single metal materials, and are therefore widely used in all walks of life. In addition to its structural and functional characteristics, metal composite plates can also save the use of precious metals and significantly reduce the cost of various equipment materials. Among them, the hot-dip galvanizing process is already very mature. It is based on the fact that the melting point of steel is much higher than that of zinc. After the initial surface treatment, the raw material metal steel is placed in a high-temperature metal zinc solution. A series of physical and chemical reactions will occur between the two, and after later treatment, a layer of zinc coating will appear on the surface of the steel.

[0003] Zinc is a light grey transition metal with a melting point of 420℃. It has excellent thermal conductivity and electrical conductivity. Its thermal conductivity is close to that of other metal materials, such as aluminum, copper, and iron. This means that zinc can quickly transfer heat to its surface, allowing it to dissipate heat quickly. Therefore, zinc is widely used as a heat dissipation material in many electronic and electrical equipment. The conductivity of zinc is 29% of that of standard electrical copper. Since zinc is non-magnetic, it has good resistance to electromagnetic fields. Zinc sheet is a very effective shielding material, suitable for making instrument parts, instrument housings, and coins. At the same time, zinc itself will not produce sparks when it collides with other metals, making it suitable for underground explosion-proof equipment. Galvanizing has excellent resistance to atmospheric corrosion, and a protective film is easily formed on the surface at room temperature. Therefore, the largest use of zinc is in the galvanizing industry. It is mainly used for surface coating of steel and steel structures (such as galvanized sheet), and is widely used in automobiles, construction, ships, light industry, and other industries.

[0004] Titanium is a silvery-white transition metal with a melting point of 1668°C. Pure titanium is a very important metal material with excellent properties such as lightness, high strength, corrosion resistance, and non-magnetic properties. It is widely used in aerospace, shipbuilding, chemical and petrochemical, transportation, weapons, ocean, electricity, construction, metallurgy, and light industry. However, titanium has poor thermal conductivity and electrical conductivity. Its thermal conductivity is about 15.2W / (m·K), which is 1 / 4 of nickel, 1 / 5 of iron, and 1 / 14 of aluminum. In addition, the thermal conductivity of various titanium alloys is about 50% lower than that of titanium. The electrical conductivity of titanium is relatively low, at 1.37×10 -6S / m, this is because titanium is a transition metal with a high resistivity; titanium can still conduct electricity, so it is used as a conductive material in many applications such as aerospace and medical fields.

[0005] Through the Ti-Zn binary phase diagram, it is known that there are at least Ti2Zn, TiZn, TiZn2, TiZn3, TiZn5, TiZn 10 、TiZn 15 There are 7 intermediate compounds, Zn is a β-Ti stabilizing element, and the eutectoid transformation temperature is as high as 620℃. D. Brice's research shows that the eutectoid reaction occurs in the Ti-Zn system, producing pearlite structure, the β-Ti parent phase is decomposed into α-Ti and the second phase, and Zn is precipitated to the grain boundary, resulting in Zn enrichment and forming Ti2Zn phase.

[0006] In summary, both titanium and zinc have the advantages of non-magneticity, corrosion resistance and biocompatibility. They differ greatly in thermal conductivity and electrical conductivity. Preparing them into composite materials can not only improve their single performance, but also save precious titanium resources. However, there is little research on titanium hot-dip galvanizing process. Summary of the invention

[0007] The purpose of the present invention is to give full play to the advantages of titanium and zinc, which are non-magnetic, corrosion-resistant and biocompatible. The thermal conductivity and electrical conductivity of titanium are improved by zinc, and pure zinc is hot-dipped on a pure titanium plate to form a new galvanized material. The galvanized material can be used as a shielding material, corrosion-resistant material, medical material, etc., and is widely used in the fields of petrochemical industry, marine engineering, medical materials, etc.

[0008] In order to achieve the above-mentioned object of the invention, the present invention provides a method for preparing a hot-dip pure zinc-titanium plate, the preparation method comprising the following steps:

[0009] ① Titanium plate treatment: After polishing the titanium plate, treat it with acid solution for 10s to 20s; this can remove oil stains or other surface contaminants on the titanium strip.

[0010] The titanium plate is polished to a surface roughness Ra of 3.2 μm. The acid solution is composed of hydrofluoric acid with a concentration of 40.0%, nitric acid with a concentration of 65.0% to 68.0%, and water, with a volume ratio of hydrofluoric acid: nitric acid: water = 2:5:93.

[0011] ② After washing with ethanol, blow dry and set aside;

[0012] ③Preparing zinc bath: placing zinc ingot (Zn content greater than 99%) into a graphite crucible, heating to 460°C to 500°C to melt and form a zinc bath.

[0013] ④ Zinc bath immersion: immerse the titanium plate treated in step ② into a molten zinc bath, take it out from the zinc bath after immersion for 10s to 15s, and naturally cool it to room temperature to form a galvanized coating. The thickness of the zinc layer in the galvanized coating is 70μm to 80μm. After immersing the titanium strip material in the molten zinc bath for a certain period of time, take it out, and the excess liquid zinc metal flows into the zinc bath, while the liquid zinc metal attached to the surface solidifies to form a galvanized coating.

[0014] Compared with the prior art, the present invention has the following beneficial effects: Currently, there are very few reports on the technology related to pure titanium and pure zinc interface composite materials. However, the hot-dip galvanizing production process is very mature. After replacing the steel plate in the hot-dip galvanizing production process with a titanium plate, the technical solution of the present invention can quickly realize large-scale and batch production.

[0015] The present invention can give full play to the advantages of titanium and zinc, which are non-magnetic, corrosion-resistant and biocompatible. The thermal conductivity and electrical conductivity of titanium are improved by zinc, and pure zinc is hot-dipped on a pure titanium plate to form a new galvanized material. The material can be used as a shielding material, corrosion-resistant material, medical material, etc., and can be widely used in the fields of petrochemical industry, marine engineering, medical materials, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The metallographic structure diagram of the hot-dip pure zinc-titanium plate prepared in the embodiment;

[0017] Figure 2 This is a surface scanning analysis diagram of the hot-dip pure zinc-titanium plate prepared in the embodiment. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with specific examples, but the present invention is not limited in any way. To avoid redundant description, the raw materials in the following examples are all commercially available products unless otherwise specified, and the methods used are all conventional methods unless otherwise specified.

[0019] ① Titanium plate treatment: After polishing the titanium plate, treat it with acid solution for 10s to 20s;

[0020] ② After cleaning with ethanol, blow dry and set aside;

[0021] ③Preparing zinc bath: placing zinc ingot into a graphite crucible and heating to 460°C to 500°C to melt and form a zinc bath;

[0022] ④ Zinc bath immersion: immerse the titanium plate treated in step ② into a molten zinc bath, take it out from the zinc bath after immersion for 10s to 15s, and naturally cool it to room temperature to form a galvanized coating.

[0023] The matters not described in the following embodiments are the same as the description of the above specific implementation methods.

[0024] Example

[0025] A method for preparing a hot-dip pure zinc-titanium plate, the specific process flow is as follows:

[0026] ① Titanium plate processing: A titanium plate TA2 with a size of 600×80×0.6 mm was processed, and the titanium plate was polished to a surface roughness Ra of 3.2 μm. After polishing, it was treated with an acid solution for 15 seconds.

[0027] The acid solution is composed of hydrofluoric acid with a concentration of 40.0%, nitric acid with a concentration of 68.0% and water. 2 ml of hydrofluoric acid HF, 5 ml of nitric acid HNO3 and 93 ml of water H2O are taken in a volume ratio of 2:5:93 to prepare the acid solution.

[0028] ② Clean with ethanol, blow dry and set aside;

[0029] ③ Place the zinc ingot (Zn content greater than 99%) into a graphite crucible and heat it in a crucible electric furnace to form a 500°C molten zinc bath.

[0030] ④ Use crucible tongs to quickly remove the oxide layer on the surface of the zinc liquid, quickly insert the prepared titanium plate into the zinc bath, keep it warm for 10 seconds and take it out. A layer of zinc has been plated on the surface of the titanium plate. Cool it to room temperature to obtain a hot-dip pure zinc titanium plate.

[0031] The hot-dip galvanized titanium plate obtained in the embodiment was sampled and then the metallographic structure was observed. Figure 1 This is a metallographic organization diagram. The thickness of the upper zinc layer is about 70μm to 80μm, and the lower layer is a titanium layer. The bonding surface between titanium and zinc is good, without defects such as pores, inclusions, microcracks and unwelded parts. Figure 2 In combination with the surface scanning analysis, there is an obvious transition layer between the titanium layer and the zinc layer, and the diffusion concentration of titanium to zinc decreases gradually, producing different intermediate compounds.

[0032] For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for preparing a hot-dip pure zinc-titanium plate, characterized in that: The preparation method comprises the following steps: ① Titanium plate treatment: After polishing the titanium plate, treat it with acid solution for 10s to 20s; ② After washing with ethanol, blow dry and set aside; ③Preparing zinc bath: placing zinc ingot into a graphite crucible and heating to 460°C to 500°C to melt and form a zinc bath; ④ Zinc bath immersion: immerse the titanium plate treated in step ② into a molten zinc bath, take it out from the zinc bath after immersion for 10s to 15s, and naturally cool it to room temperature to form a galvanized coating.

2. The preparation method according to claim 1, characterized in that: Step ① The titanium plate is polished to a surface roughness Ra of 3.2 μm.

3. The preparation method according to claim 1, characterized in that: Step ① The acid solution is composed of hydrofluoric acid with a concentration of 40.0%, nitric acid with a concentration of 65.0% to 68.0%, and water, with a volume ratio of hydrofluoric acid: nitric acid: water = 2:5:

93.

4. The preparation method according to claim 1, characterized in that: Step ③: The Zn mass content in the zinc ingot is greater than 99%.

5. The preparation method according to claim 1, characterized in that: The thickness of the zinc layer in the galvanized coating in step ④ is 70 μm to 80 μm.

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