Preparation process of a steel-aluminum composite plate with a low vacuum surface outgassing rate

Abstract

The present invention relates to a preparation process of a steel-aluminum composite plate with a low vacuum surface outgassing rate, belonging to the technical field of composite plates. In the present invention, a steel-aluminum composite plate with a compact structure is prepared through processes of welding, annealing, and warm rolling. And a surface strengthening layer coating is applied on the surface of the steel-aluminum composite plate. The coating uses polytetrafluoroethylene emulsion as the base material, adds modified titanium nitride and aluminum nitride, and combines with other additives to form a dense coating on the surface of the steel-aluminum composite plate, thereby reducing the surface outgassing rate of the steel-aluminum plate in a vacuum environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite plates and relates to a preparation process of a steel-aluminum composite plate with a low vacuum surface outgassing rate. Background Art

[0002] A steel-aluminum composite plate is a new type of material prepared by using a composite technology to achieve a firm metallurgical bond between two different metals, namely a steel plate and an aluminum plate, at the interface.

[0003] Any solid material can dissolve and adsorb some gases in the atmospheric environment. When the material is placed in a vacuum, it will outgas due to desolvation and desorption. The research on the outgassing rate of vacuum materials has extensive application value in the research of satellite, spacecraft and space station pollution protection, the development of atomic clocks, the acquisition and measurement of extremely high vacuum, the manufacturing of light sources and heat sources, etc.

[0004] Compared with the commonly used stainless steel material in the vacuum industry as the manufacturing raw material, the steel-aluminum composite plate not only has the advantages of relatively low price and easy cutting and processing of carbon steel, but also has various excellent properties of aluminum. As a vacuum system material, it can have an extremely low vacuum surface outgassing rate under the same vacuum degree and has the same corrosion resistance as stainless steel. Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation process of a steel-aluminum composite plate with a low vacuum surface outgassing rate. In the present invention, a steel-aluminum composite plate with a compact structure is prepared through the processes of welding, annealing and warm rolling, and a surface strengthening layer coating is applied on the surface of the steel-aluminum composite plate, thereby reducing the surface outgassing rate of the steel-aluminum plate in a vacuum environment.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A preparation process of a steel-aluminum composite plate with a low vacuum surface outgassing rate includes the following steps:

[0008] S1. The steel plate and the aluminum plate are leveled and polished by a grinding machine, and then the surfaces of the steel plate and the aluminum plate are washed with an acid solution. After the washing is completed, nitrogen is introduced at 70 °C to blow the steel plate and the aluminum plate for 4 - 6 h to obtain dry steel plate and aluminum plate;

[0009] S2. The steel plate obtained in step S1 is used as the clad plate on the upper side, and the aluminum plate is used as the base plate on the lower side, and a steel-aluminum composite plate is prepared by welding;

[0010] S3. The welded steel-aluminum composite plate is annealed at 450 - 550 °C for 15 - 25 h, and then warm rolled with a pass reduction rate of 15 - 20%. Then it is cooled to 200 - 250 °C and kept warm for 8 - 11 h, and then naturally cooled to room temperature;

[0011] S4. First, sandblast the surface of the steel-aluminum composite plate after step S3, evenly coat the prepared surface strengthening layer coating raw material on the surface of the steel-aluminum composite plate by ultrasonic spraying, and then obtain the steel-aluminum composite plate with low vacuum surface outgassing rate through laser drying and curing. Among them, the power of the laser drying is 15 - 20 MW, the drying time is 25 - 30 s, and the surface strengthening layer is obtained by curing the following components in parts by mass: 30 - 45 parts of polytetrafluoroethylene emulsion, 3 - 5 parts of dispersant, 3 - 5 parts of surfactant, 5 - 8 parts of deionized water, 5 - 8 parts of modified titanium nitride, 3 - 5 parts of aluminum nitride. Among them, the modified titanium nitride is prepared by nitriding treatment with zirconium tetrachloride, solvent and titanium source as raw materials under nitrogen.

[0012] As a preferred technical solution of the present invention, in step S1, the inlet flow rate of the nitrogen is 15 m / s.

[0013] As a preferred technical solution of the present invention, in step S1, the acid solution is a hydrochloric acid aqueous solution with a mass fraction of 15%.

[0014] As a preferred technical solution of the present invention, in step S2, the specific process of the welding is as follows: Place the aluminum plate and the steel plate in a vacuum-sealed environment with a welding vacuum degree ≤ 1.0 Pa. Use the steel plate as the cladding plate on the upper side and the aluminum plate as the substrate on the lower side for welding treatment. The welding conditions are: under argon protection, the welding current is 80 - 100 A, and the welding depth is 50 - 80 mm.

[0015] As a preferred technical solution of the present invention, in step S4, the preparation method of the surface strengthening layer coating raw material is as follows: First, crush the modified titanium nitride and aluminum nitride through a crusher and then pass through a 100-mesh sieve. Then, according to the parts by mass, fully stir the polytetrafluoroethylene emulsion and deionized water evenly, and then add the surfactant and dispersant, and fully stir evenly to obtain the prepared surface strengthening layer coating raw material.

[0016] As a preferred technical solution of the present invention, in step S4, the power of the ultrasonic spraying is 60 - 80 W, the ultrasonic frequency is 160 - 200 kHz, the continuous spraying amount is 700 - 1000 mL / h, and the spraying distance is 30 - 50 mm.

[0017] As a preferred technical solution of the present invention, in step S4, the preparation process of the modified titanium nitride is as follows:

[0018] Mix zirconium tetrachloride, a solvent, and a titanium source, stir at 100 - 200 °C for 6 - 9 h, naturally cool to room temperature after stirring, then filter, wash with deionized water, dry at 95 - 105 °C for 3 - 5 h, and calcine the dried solid in air at 300 - 450 °C for 4 - 6 h to obtain solid A. The titanium source is one of titanium oxysulfate, tetraethyl titanate, tetrabutyl titanate, or tetrapentyl titanate, and the solvent is one or more of methanol, ethanol, isopropanol, propylene glycol, glycerol, or ether;

[0019] Pass nitrogen into a tubular furnace at 700 - 900 °C for the solid A, perform nitridation treatment for 4 - 7 h, naturally cool to room temperature after completion, and ball mill at a rotation speed of 500 r / min for 3 h to prepare the modified titanium nitride.

[0020] As a preferred technical solution of the present invention, in step S4, the dispersant is one of polyether-modified polysiloxane and hydroxyethyl cellulose.

[0021] As a preferred technical solution of the present invention, in step S4, the surfactant is an alkynediol surfactant.

[0022] Titanium nitride has a low secondary electron emission rate. Adding titanium nitride to the coating helps reduce gas release in the vacuum system. In the present invention, when preparing titanium nitride, a zirconium salt is added and calcined to obtain zirconium-containing titanium nitride. Zirconium and titanium have similar atomic sizes and properties, and can form a solid solution in titanium nitride, thereby improving the vacuum performance.

[0023] Polytetrafluoroethylene, as a fluorocarbon resin, the fluorocarbon resin coating has excellent weather resistance, chemical resistance, and sealing performance, and can effectively prevent the penetration and release of gas molecules. After adding a coating on the surface of the steel-aluminum composite plate, due to the excellent denseness of the polytetrafluoroethylene coating itself, it can effectively reduce the pores and defects inside the coating, thereby reducing the possibility of gas release; and the coating has stable chemical properties and is not easy to react with other substances in the vacuum environment, reducing gas release caused by chemical reactions. And the coating has excellent weather resistance and corrosion resistance, and can resist the erosion of the harsh environment on the coating surface, thereby maintaining the integrity and stability of the coating and reducing gas release.

[0024] The present invention adds aluminum nitride to the surface strengthening layer coating. Aluminum nitride has high thermal conductivity and can more effectively conduct the heat inside the coating, reducing gas release inside the material caused by temperature rise. Aluminum nitride has stable chemical properties and is not easy to react with other substances, which helps reduce gas release caused by chemical reactions in the vacuum environment; aluminum nitride has good thermal shock resistance and high-temperature mechanical properties, and can enhance the overall strength and stability of the coating, thereby reducing gas release caused by coating damage.

[0025] When preparing the steel-aluminum composite plate in the present invention, first, the surface of the metal composite plate is cleaned with acid solution to remove adsorbed impurities and gases, reducing the gas source, and then dried with nitrogen; then laser welding is carried out. Laser welding has the characteristics that the heat source and the light path are easy to control and the control is simple, which can accurately control the welding process, ensure the weld quality, and is beneficial to maintaining the shape and size stability of the composite plate.

[0026] During the laser welding process, the stirring effect of the laser beam on the molten pool can inhibit the generation of pores. When welding with a high laser power density, the volume of the molten pool is small, the cooling is fast, the precipitation time of hydrogen bubbles is short, and the bubble escape speed is greater than the bubble precipitation and growth speed, thus obtaining a weld with a low porosity.

[0027] At the same time, during the laser welding process, the heat source is concentrated and has high energy, and the welding speed is fast, reducing the reaction time between the surface of the composite plate and oxygen, nitrogen, etc. in the air, thereby reducing the gas release caused by chemical reactions.

[0028] After welding, the welding residual stress is removed by annealing to avoid cracking and deformation caused by stress concentration. Then, through plastic deformation during warm rolling, the internal structure of the composite plate becomes more compact, improving the density.

[0029] Beneficial effects of the present invention:

[0030] In the present invention, a steel-aluminum composite plate with a compact structure is prepared by the processes of laser welding, annealing, and warm rolling, and a surface strengthening layer coating is applied on the surface of the steel-aluminum composite plate. This coating uses polytetrafluoroethylene emulsion as the base material, adds modified titanium nitride and aluminum nitride, and combines with other additives to form a dense coating on the surface of the steel-aluminum composite plate, thereby reducing the surface outgassing rate of the steel-aluminum composite plate in a vacuum environment. Specific embodiments

[0031] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following examples are used to describe in detail the specific embodiments, structures, features, and their effects according to the present invention.

[0032] In the following examples and comparative examples:

[0033] The aluminum plate used is 1060 aluminum plate, and the steel plate is 10# high-quality low-carbon steel plate;

[0034] Polyether-modified polysiloxane: purchased from Shanghai Kelaman Reagent Co., Ltd.;

[0035] Polytetrafluoroethylene emulsion: purchased from Hubei Shiteng Chemical Technology Co., Ltd., product number: 0213;

[0036] Tetraethyl titanate: purchased from Hubei Dongcao Chemical Technology Co., Ltd.;

[0037] Zirconium tetrachloride: purchased from Shanghai Merck Chemical Technology Co., Ltd.;

[0038] Alkynediol surfactant: purchased from Jiangsu Xinsu New Materials Co., Ltd.;

[0039] Aluminum nitride: purchased from Yumu (Ningbo) New Materials Co., Ltd.

[0040] Example 1

[0041] S1. The steel plate and aluminum plate are leveled and polished by a grinding machine, and then the surfaces of the steel plate and aluminum plate are washed with a hydrochloric acid aqueous solution with a mass fraction of 15%. After the washing is completed, nitrogen is introduced at 70 °C to purge the steel plate and aluminum plate for 4 h to obtain a dry steel plate and aluminum plate, and the introduction flow rate of nitrogen is 15 m / s;

[0042] S2. The steel plate after step S1 is used as the cladding plate on the upper part, and the aluminum plate is used as the base plate on the lower part, and they are placed in a vacuum-sealed environment for welding treatment. The welding vacuum degree ≤ 1.0 Pa, and the welding conditions are: under argon protection, the welding current is 80 A, and the welding depth is 50 mm. The steel-aluminum composite plate is prepared by welding;

[0043] S3. The welded steel-aluminum composite plate is annealed at 450 °C for 15 h, then warm-rolled, the pass reduction rate is 15%, then cooled to 200 °C, and kept warm for 8 h, and then naturally cooled to room temperature;

[0044] S4. The preparation process of modified titanium nitride is as follows:

[0045] Zirconium tetrachloride, ethanol and tetraethyl titanate are mixed and stirred at 100 °C for 6 h. After stirring, it is naturally cooled to room temperature, then filtered, washed with deionized water, dried at 95 °C for 3 h, and the dried solid is calcined in air at 300 °C for 4 h to obtain solid A;

[0046] Solid A is introduced with nitrogen in a tube furnace at 700 °C for nitriding treatment for 4 h, and after cooling to room temperature naturally, it is ball-milled at a speed of 500 r / min for 3 h by a ball mill to prepare the modified titanium nitride.

[0047] By weight, first 5 parts of modified titanium nitride and 3 parts of aluminum nitride are pulverized by a pulverizer and passed through a 100-mesh sieve, then 30 parts of polytetrafluoroethylene emulsion and 5 parts of deionized water are fully stirred evenly, and then 3 parts of polyether-modified polysiloxane and 3 parts of alkynediol surfactant are added, and after fully stirring evenly, the prepared surface strengthening layer coating raw material is obtained.

[0048] First, sandblast the surface of the steel-aluminum composite plate that has undergone step S3. Uniformly coat the prepared surface strengthening layer coating raw material on the surface of the steel-aluminum composite plate by ultrasonic spraying, and then obtain the steel-aluminum composite plate with a low vacuum surface outgassing rate through laser drying and curing. Among them, the power of laser drying is 15 MW, the drying time is 25 s, the power of ultrasonic spraying is 60 W, the ultrasonic frequency is 160 kHz, the continuous spraying volume is 700 mL / h, and the spraying distance is 30 mm.

[0049] Example 2

[0050] S1. Level and polish the steel plate and aluminum plate with a grinding machine, and then wash the surfaces of the steel plate and aluminum plate with a hydrochloric acid aqueous solution with a mass fraction of 15%. After the washing is completed, purge the steel plate and aluminum plate with nitrogen at 70 °C for 5 h to obtain dry steel plate and aluminum plate, and the nitrogen inlet flow rate is 15 m / s;

[0051] S2. Use the steel plate that has undergone step S1 as the clad plate on top and the aluminum plate as the substrate on the bottom, place them in a vacuum-sealed environment, and perform welding treatment. The welding vacuum degree ≤ 1.0 Pa, and the welding conditions are: under argon protection, the welding current is 90 A, and the welding depth is 70 mm. Obtain the steel-aluminum composite plate through welding;

[0052] S3. Anneal the welded steel-aluminum composite plate at 500 °C for 20 h, then perform warm rolling with a pass reduction rate of 18%, then cool down to 220 °C, continue to keep warm for 9 h, and then naturally cool to room temperature;

[0053] S4. The preparation process of modified titanium nitride is as follows:

[0054] Mix zirconium tetrachloride, ethanol and tetraethyl titanate, stir at 150 °C for 7 h, naturally cool to room temperature after stirring, then filter, wash with deionized water, dry at 100 °C for 4 h, and calcine the dried solid in air at 380 °C for 5 h to obtain solid A;

[0055] Pass nitrogen into the tubular furnace at 800 °C for the solid A, perform nitriding treatment for 6 h, naturally cool to room temperature after completion, and ball mill at a speed of 500 r / min for 3 h to prepare the modified titanium nitride.

[0056] By weight, first crush 7 parts of modified titanium nitride and 4 parts of aluminum nitride through a pulverizer and pass through a 100-mesh sieve, then fully stir and mix evenly with 38 parts of polytetrafluoroethylene emulsion and 6 parts of deionized water, and then add 4 parts of polyether-modified polysiloxane and 4 parts of alkynediol surfactant, and fully stir and mix evenly to obtain the prepared surface strengthening layer coating raw material.

[0057] First, sandblast the surface of the steel-aluminum composite plate after step S3. Uniformly coat the prepared surface strengthening layer coating raw material on the surface of the steel-aluminum composite plate by ultrasonic spraying, and then obtain the low-vacuum surface outgassing rate steel-aluminum composite plate through laser drying and curing. The power of laser drying is 18 MW, the drying time is 28 s, the power of ultrasonic spraying is 70 W, the ultrasonic frequency is 180 kHz, the continuous spraying amount is 800 mL / h, and the spraying distance is 40 mm.

[0058] Example 3

[0059] S1. Level and polish the steel plate and aluminum plate with a grinding machine, and then wash the surfaces of the steel plate and aluminum plate with a hydrochloric acid aqueous solution with a mass fraction of 15%. After washing, purge the steel plate and aluminum plate with nitrogen at 70 °C for 6 h to obtain dry steel plate and aluminum plate. The inlet flow rate of nitrogen is 15 m / s.

[0060] S2. Place the steel plate after step S1 as the clad plate on top and the aluminum plate as the substrate below in a vacuum-sealed environment for welding. The welding vacuum degree ≤ 1.0 Pa, and the welding conditions are: under argon protection, the welding current is 100 A, and the welding depth is 80 mm. Obtain the steel-aluminum composite plate through welding.

[0061] S3. Anneal the welded steel-aluminum composite plate at 550 °C for 25 h, then perform warm rolling with a pass reduction rate of 20%, then cool down to 250 °C, continue to keep warm for 11 h, and then naturally cool to room temperature.

[0062] S4. The preparation process of modified titanium nitride is as follows:

[0063] Mix zirconium tetrachloride, ethanol and tetraethyl titanate, stir at 200 °C for 9 h, naturally cool to room temperature after stirring, then filter, wash with deionized water, dry at 105 °C for 5 h, and calcine the dried solid in air at 450 °C for 6 h to obtain solid A.

[0064] Pass nitrogen into the tubular furnace at 900 °C for the solid A for nitriding treatment for 7 h, naturally cool to room temperature after completion, and ball mill at a rotation speed of 500 r / min for 3 h to prepare the modified titanium nitride.

[0065] By weight, first crush 8 parts of modified titanium nitride and 5 parts of aluminum nitride through a pulverizer and pass through a 100-mesh sieve, then stir well with 45 parts of polytetrafluoroethylene emulsion and 8 parts of deionized water, and then add 5 parts of polyether-modified polysiloxane and 5 parts of alkynediol surfactant, and stir well to obtain the prepared surface strengthening layer coating raw material.

[0066] First, sandblast the surface of the steel-aluminum composite plate after step S3. Then, evenly coat the prepared surface strengthening layer coating raw material on the surface of the steel-aluminum composite plate by ultrasonic spraying. Next, obtain the low-vacuum surface outgassing rate steel-aluminum composite plate through laser drying and curing. The power of laser drying is 20 MW, and the drying time is 30 s. The power of ultrasonic spraying is 80 W, the ultrasonic frequency is 200 kHz, the continuous spraying volume is 1000 mL / h, and the spraying distance is 50 mm.

[0067] Comparative Example 1

[0068] When comparing Comparative Example 1 with Example 1, in Comparative Example 1, titanium nitride in step S4 was not modified, and zirconium tetrachloride was not added, while the other operations were the same.

[0069] Comparative Example 2

[0070] The difference between Comparative Example 2 and Example 1 is that in Comparative Example 2, no surface strengthening layer coating was applied on the surface of the steel-aluminum composite plate, while the other operations were the same.

[0071] Performance test:

[0072] The specific process of testing the steel-aluminum composite plates prepared in Examples 1-3 and Comparative Examples 1-2 by the static pressure rise method is as follows:

[0073] Pump the measuring device to the ultimate vacuum, close the high-vacuum chamber valve, pump the high-vacuum constant volume chamber to the ultimate vacuum and then start the measurement. The pressure change is measured by a capacitance diaphragm vacuum gauge with a range of 133 Pa, and the ultimate vacuum degree is 9.2ⅹ10 -9 P. The calculation formula for the surface outgassing rate (q) is:

[0074] q = (△P * V) / (t * S)

[0075] where △P is the pressure difference, Pa; V is the volume. In this method, the volume of the sample chamber is 1.17ⅹ10 -2 ; t is the time interval. In this method, the time interval is 1800 s; S is the surface area of the steel-aluminum composite plate, 100 cm 2 .

[0076] Repeat the experiment 6 times according to the above experimental process and calculate the average value to obtain the surface outgassing rate of the high-vacuum chamber:

[0077]

[0078] According to the above data, it can be seen that the steel-aluminum composite plate prepared in the present invention has a low surface outgassing rate under vacuum conditions.

[0079] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content without departing from the technical solution of the present invention. However, as long as it does not depart from the technical solution content of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A process for preparing a steel-aluminum composite plate with low vacuum surface outgassing rate, characterized in that: The following steps are involved: S1. Grind the steel plate and the aluminum plate by a grinder, then wash the surface of the steel plate and the aluminum plate by acid solution. After washing, blow nitrogen gas through the steel plate and the aluminum plate at 70° C. for 4 to 6 hours to obtain dry steel plate and aluminum plate; S2, placing the steel plate obtained in step S1 as the cover plate on the top and the aluminum plate as the base plate on the bottom, and preparing a steel-aluminum composite plate by welding; S3, annealing the welded steel-aluminum composite plate at 450-550°C for 15-25h, then warm rolling with a pass reduction rate of 15-20%, cooling to 200-250°C, keeping warm for 8-11h, and then naturally cooling to room temperature; S4, firstly sandblasting the surface of the steel-aluminum composite plate after step S3, uniformly coating the prepared surface strengthening layer coating raw material on the surface of the steel-aluminum composite plate by ultrasonic spraying, and then curing by laser drying to obtain the low vacuum surface degassing rate steel-aluminum composite plate, wherein the power of the laser drying is 15-20MW, the drying time is 25-30s, and the surface strengthening layer is cured by curing the following components by weight: 30-45 parts of polytetrafluoroethylene emulsion, 3-5 parts of dispersant, 3-5 parts of surfactant, 5-8 parts of deionized water, 5-8 parts of modified titanium nitride, and 3-5 parts of aluminum nitride, wherein the modified titanium nitride is prepared by nitriding zirconium tetrachloride, solvent and titanium source as raw materials under nitrogen; The preparation process of the modified titanium nitride is as follows: The zirconium tetrachloride, solvent and titanium source are mixed, stirred at 100-200°C for 6-9h, cooled naturally to room temperature after stirring, filtered, washed with deionized water, dried at 95-105°C for 3-5h, and the dried solid is calcined at 300-450°C for 4-6h to obtain solid A, wherein the titanium source is one of titanyl sulfate, tetraethyl titanate, tetrabutyl titanate and tetrapentyl titanate, and the solvent is one or more of methanol, ethanol, isopropanol, propylene glycol, glycerol or ether; Solid A was nitrided by introducing nitrogen into a tube furnace at 700-900° C. for 4-7 hours, and then naturally cooled to room temperature. The solid was ball milled at a speed of 500 r / min for 3 hours to prepare the modified titanium nitride.

2. The process for preparing the steel-aluminum composite plate with low vacuum surface outgassing rate according to claim 1, characterized in that: In step S1, the nitrogen gas is introduced at a flow rate of 15 m / s.

3. The process for preparing the steel-aluminum composite plate with low vacuum surface outgassing rate according to claim 1, characterized in that: In step S1, the acid solution is a hydrochloric acid aqueous solution with a mass fraction of 15%.

4. The process for preparing the steel-aluminum composite plate with low vacuum surface outgassing rate according to claim 1, characterized in that: In step S2, the specific process of welding is: placing the aluminum plate and the steel plate in a vacuum sealed environment, the welding vacuum degree is ≤1.0Pa, the steel plate is used as the cover plate on the top, and the aluminum plate is used as the base plate on the bottom, and welding is performed. The welding conditions are: under argon protection, the welding current is 80~100A, and the welding depth is 50~80mm.

5. The process for preparing the steel-aluminum composite plate with low vacuum surface outgassing rate according to claim 1, characterized in that: In step S4, the preparation method of the surface strengthening layer coating raw material is: first, according to the mass fraction, the modified titanium nitride and aluminum nitride are crushed by a crusher and then passed through a 100-mesh sieve, and then fully stirred with polytetrafluoroethylene emulsion and deionized water, and then a surfactant and a dispersant are added, and the prepared surface strengthening layer coating raw material is obtained after fully stirring.

6. The process for preparing a steel-aluminum composite plate with low vacuum surface outgassing rate according to claim 1, characterized in that: In step S4, the power of the ultrasonic spraying is 60-80 W, the ultrasonic frequency is 160-200 kHz, the continuous spraying amount is 700-1000 mL / h, and the spraying distance is 30-50 mm.

7. The process for preparing a steel-aluminum composite plate with low vacuum surface outgassing rate according to claim 1, characterized in that: In step S4, the dispersant is one of polyether-modified polysiloxane and hydroxyethyl cellulose.

8. The process for preparing a steel-aluminum composite plate with low vacuum surface outgassing rate according to claim 1, characterized in that: In step S4, the surfactant is an acetylene glycol surfactant.

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