A copper-aluminum composite metal and plastic composite material and a preparation method thereof

Abstract

The application belongs to the technical field of copper-aluminum metal and plastic integrated forming composite production, and particularly relates to a copper-aluminum composite metal and plastic composite material and a preparation method thereof. Compared with the prior art, the copper-aluminum composite metal and plastic composite material can be better applied to electronic appliances and battery energy products, can improve the electrical performance requirements and strength requirements of products, and makes the products more portable and reliable. The preparation process is short, the process parameters are wide, the production feasibility is high, and the product quality is stable. The copper-aluminum composite metal is uniformly distributed in the nano-pores filled with plastic by injection molding, which greatly strengthens the bonding strength of the composite part, so that the copper-aluminum composite metal and plastic composite material will not crack and leak due to insufficient local bonding strength under pressure.

Description

Technical Field

[0001] This invention relates to the field of integrated metal and plastic composite manufacturing technology, and particularly to a copper-aluminum composite metal and plastic composite material and its preparation method. Background Technology

[0002] Copper-aluminum composite materials are made from copper-based and aluminum-based materials in a certain proportion through processes such as explosive welding or cold rolling. They possess the high electrical and thermal conductivity and good processing performance of copper, as well as the high strength, high hardness, and high corrosion resistance of aluminum. Many electronic products require both the electrical properties of metals and the insulating properties of plastics, and structurally, they need both the strength of metals and lightweight design. Copper-aluminum composite metal-plastic integrated molding technology can meet the performance requirements of these products. Conventional insert injection molding involves machining clips into a metal part, then injection molding to connect the plastic and metal parts under localized tensile force. This requires a certain thickness in the metal part, and the clip machining is complex. This results in high processing costs, low bonding strength between the metal and plastic, and a lack of sealing. Especially in battery products, after injecting electrolyte and sealing, the metal and plastic must not crack and leak under certain pressure, causing electrolyte leakage, battery malfunction, or danger. By treating metal with nanopores and then injection molding it into plastic as a single unit, the bonding strength and sealing performance between the metal and plastic can be greatly increased, thus solving the problems of cracking and leakage.

[0003] Existing technical solutions mostly employ composites of aluminum alloys and plastics, or copper alloys and plastics. However, the integrated molding of copper-aluminum composite metals and plastics allows the material to possess both the properties of copper and aluminum, as well as the properties of plastics, better meeting product requirements and improving product functionality and stability. Copper and aluminum are two metals with significantly different reactivity. Therefore, it's not simply a matter of combining copper and aluminum nanopore treatment methods. The chemicals used in aluminum treatment have no effect on copper, while the chemicals used in copper treatment will damage the surface pores of aluminum, resulting in some areas lacking adhesion to the plastic.

[0004] Therefore, there is an urgent need for a new copper-aluminum composite metal and plastic composite material and its preparation method, which can simultaneously process aluminum and copper to create nanopores on their surfaces. Summary of the Invention

[0005] This invention provides a copper-aluminum composite metal and plastic composite material and its preparation method, which is mainly used in battery electrodes, battery casings, aerospace, automobile manufacturing, electronics and electrical appliances and other fields. It aims to solve the problem that existing processes cannot effectively process copper and aluminum at the same time, resulting in nanopores on the surface of copper-aluminum composite metals.

[0006] In a first aspect, the present invention provides a method for preparing a composite material of copper-aluminum composite metal and plastic, the method comprising the following steps:

[0007] Step S1: Immerse the copper-aluminum composite metal in the first solution for 5-10 minutes, and then clean the copper-aluminum composite metal with deionized water for the first time after immersion; wherein, the first solution includes sodium carbonate, sodium tripolyphosphate, borax, isomeric decacarbonyl polyoxyethylene 7 ether and coconut oil fatty acid diethanolamide, and the temperature of the first solution is 55-65℃.

[0008] Step S2: Immerse the copper-aluminum composite metal after the first cleaning in the second solution for 1-5 minutes; wherein the second solution includes sulfuric acid, ammonium bifluoride, ammonium chloride and benzotriazole, and the temperature of the second solution is 20-35℃;

[0009] Step S3: After soaking in the second solution, immerse the copper-aluminum composite metal in the third solution for 1-2 minutes, and then wash the copper-aluminum composite metal a second time with deionized water; wherein, the third solution includes sodium hydroxide, sodium carbonate, disodium ethylenediaminetetraacetate and sodium molybdate, and the temperature of the third solution is 45-65℃;

[0010] Step S4: Immerse the copper-aluminum composite metal after the second cleaning in the fourth solution for 1-3 minutes, and then clean the copper-aluminum composite metal for the third time with deionized water; wherein, the fourth solution includes nitric acid, hydrofluoric acid and ferric sulfate, and the temperature of the fourth solution is 25-35℃;

[0011] Step S5: Immerse the copper-aluminum composite metal after the third cleaning in the fifth solution for electrolysis for 5-10 minutes, and then clean the copper-aluminum composite metal after electrolysis with deionized water for the fourth time; wherein, the fifth solution includes sulfuric acid, sodium dihydrogen phosphate and graphite, and the temperature of the fifth solution is 18-21℃; during electrolysis, the copper-aluminum composite metal is used as the anode and graphite is used as the cathode, and the electrolysis voltage is 6-15V;

[0012] Step S6: Immerse the copper-aluminum composite metal after the fourth cleaning in the sixth solution for 5-10 minutes, and then clean the copper-aluminum composite metal after immersion in deionized water for the fifth time; wherein, the sixth solution includes sulfuric acid, hydrogen peroxide and ethylenediaminetetramethylenephosphonic acid, and the temperature of the sixth solution is 30-50℃;

[0013] Step S7: Dry the copper-aluminum composite metal after the fifth cleaning.

[0014] Step S8: The dried copper-aluminum composite metal is bonded to plastic by injection molding.

[0015] Preferably, in step S1, each liter of the first solution contains 10-20 grams of the sodium carbonate, 10-20 grams of the sodium tripolyphosphate, 3-8 grams of the borax, 1-5 grams of the isomeric decacarbonyl polyoxyethylene 7 ether, and 1-2 grams of the coconut oil fatty acid diethanolamide, with the remainder being water.

[0016] Preferably, in step S2, each liter of the second solution contains 15-25 grams of the sulfuric acid, 1-4 grams of the ammonium bifluoride, 20-30 grams of the ammonium chloride, and 1-2 grams of the benzotriazole, with the remainder being water.

[0017] Preferably, in step S3, each liter of the third solution contains 30-40 grams of sodium hydroxide, 10-20 grams of sodium carbonate, 2-5 grams of disodium ethylenediaminetetraacetate, and 2-5 grams of sodium molybdate, with the remainder being water.

[0018] Preferably, in step S4, each liter of the fourth solution contains 30-60 grams of nitric acid, 5-10 grams of hydrofluoric acid, 30-40 grams of ferric sulfate, and the remainder is water.

[0019] Preferably, in step S5, each liter of the fifth solution contains 100-200 grams of sulfuric acid and 20-40 grams of sodium dihydrogen phosphate, with the remainder being water.

[0020] Preferably, in step S6, each liter of the sixth solution contains 40-60 grams of the sulfuric acid, 5-10 grams of the hydrogen peroxide, and 5-10 grams of the ethylenediaminetetramethylenephosphonic acid, with the remainder being water.

[0021] Preferably, in step S7, the copper-aluminum composite metal after the fifth cleaning is dried in an oven; the temperature inside the oven is 100°C and the baking time is 10 minutes.

[0022] Preferably, in step S8, the step of bonding the dried copper-aluminum composite metal with the plastic by injection molding specifically involves: placing the dried copper-aluminum composite metal as a metal insert into an injection mold, and then bonding the copper-aluminum composite metal in the injection mold with the plastic by injection molding. The plastic is any one of polyphenylene sulfide, saturated polyester terephthalate, polyamide, and acrylonitrile-butadiene-styrene copolymer.

[0023] The second invention also provides a composite material of copper-aluminum composite metal and plastic, wherein the composite material of copper-aluminum composite metal and plastic is prepared by the above-described method for preparing the composite material of copper-aluminum composite metal and plastic.

[0024] Compared with the prior art, the present invention involves immersing the copper-aluminum composite metal in a first solution for 5-10 minutes, then rinsing the copper-aluminum composite metal with deionized water; immersing the copper-aluminum composite metal in a second solution for 1-5 minutes; immersing the copper-aluminum composite metal in a third solution for 1-2 minutes, then rinsing the copper-aluminum composite metal with deionized water; immersing the copper-aluminum composite metal in a fourth solution for 1-3 minutes, and then... The completed copper-aluminum composite metal is then cleaned a third time with deionized water. After the third cleaning, the copper-aluminum composite metal is immersed in a fifth solution for electrolysis for 5-10 minutes, followed by a fourth cleaning with deionized water. After the fourth cleaning, the copper-aluminum composite metal is immersed in a sixth solution for 5-10 minutes, followed by a fifth cleaning with deionized water. After the fifth cleaning, the copper-aluminum composite metal is dried. Finally, the dried copper-aluminum composite metal is bonded to plastic via injection molding. This allows copper-aluminum composite metals and plastics to be better applied to electronic appliances and battery energy products, improving the electrical performance and strength requirements of the products, making them lighter and more reliable. The manufacturing process is simpler, shorter, with a wider range of process parameters, high production feasibility, and stable product quality. The uniformly distributed nanopores of the copper-aluminum composite metal are filled by the plastic through injection molding, greatly strengthening the bonding strength of the composite. This prevents cracking and air leakage in the copper-aluminum composite metal and plastics due to insufficient local bonding strength under pressure. Furthermore, the protected nanopores will not fail due to self-oxidation or other factors within a 6-month period. This long shelf life completely eliminates product defects and losses caused by untimely injection molding during production. In production, various factors often prevent immediate injection molding after surface treatment; this long shelf life effectively ensures the stability and excellent quality of the copper-aluminum composite metal and plastics composite material. Attached Figure Description

[0025] The present invention will now be described in detail with reference to the accompanying drawings. The above and other aspects of the present invention will become clearer and more readily understood through the detailed description following the accompanying drawings. In the drawings:

[0026] Figure 1 This is a flowchart of the method for preparing a copper-aluminum composite metal and plastic composite material provided in the embodiments of the present invention;

[0027] Figure 2 This is a schematic diagram of the microstructure of the surface of the copper-aluminum composite metal after step S6, as provided in this embodiment of the invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] Implementation Method 1

[0030] This invention provides a method for preparing a composite material of copper-aluminum composite metal and plastic, combined with... Figures 1-2 As shown, the method for preparing the composite material includes the following steps:

[0031] Step S1: Immerse the copper-aluminum composite metal in the first solution for 5-10 minutes, and then clean the copper-aluminum composite metal with deionized water for the first time after immersion.

[0032] The first solution comprises sodium carbonate, sodium tripolyphosphate, borax, isomeric decacarbonyl polyoxyethylene 7 ether, and coconut oil fatty acid diethanolamide, and the temperature of the first solution is 55-65℃.

[0033] In this embodiment, each liter of the first solution contains 10-20 grams of sodium carbonate, 10-20 grams of sodium tripolyphosphate, 3-8 grams of borax, 1-5 grams of isomeric decacarbonyl polyoxyethylene 7 ether, and 1-2 grams of coconut oil fatty acid diethanolamide, with the remainder being water.

[0034] Step S1, also known as cleaning, completely removes oil stains from the surface of the copper-aluminum composite metal, allowing it to react completely and uniformly in step S2.

[0035] Step S2: Immerse the copper-aluminum composite metal after the first cleaning in the second solution for 1-5 minutes.

[0036] The second solution comprises sulfuric acid, ammonium hydrogen fluoride, ammonium chloride, and benzotriazole, and the temperature of the second solution is 20-35℃.

[0037] In this embodiment, each liter of the second solution contains 15-25 grams of the sulfuric acid, 1-4 grams of the ammonium fluoride, 20-30 grams of the ammonium chloride, and 1-2 grams of the benzotriazole, with the remainder being water.

[0038] Step S2, also known as activation leveling, removes the copper oxide scale from the surface of the copper-aluminum composite metal.

[0039] Step S3: After soaking in the second solution, immerse the copper-aluminum composite metal in the third solution for 1-2 minutes, and then clean the copper-aluminum composite metal a second time with deionized water.

[0040] The third solution comprises sodium hydroxide, sodium carbonate, disodium ethylenediaminetetraacetate, and sodium molybdate, and the temperature of the third solution is 45-65℃.

[0041] In this embodiment, each liter of the third solution contains 30-40 grams of sodium hydroxide, 10-20 grams of sodium carbonate, 2-5 grams of disodium ethylenediaminetetraacetate, and 2-5 grams of sodium molybdate, with the remainder being water.

[0042] Step S3, also known as electrolytic hole forming, removes the aluminum oxide scale from the surface of the copper-aluminum composite metal.

[0043] Step S4: Immerse the copper-aluminum composite metal after the second cleaning in the fourth solution for 1-3 minutes, and then clean the copper-aluminum composite metal for the third time with deionized water.

[0044] The fourth solution includes nitric acid, hydrofluoric acid, and ferric sulfate, and the temperature of the fourth solution is 25-35℃.

[0045] In this embodiment, each liter of the fourth solution contains 30-60 grams of nitric acid, 5-10 grams of hydrofluoric acid, 30-40 grams of ferric sulfate, and the remainder is water.

[0046] Step S4, also known as the protective treatment, effectively cleans the reaction residues on the copper-aluminum composite metal surface after steps S2 and S3.

[0047] Step S5: Immerse the copper-aluminum composite metal after the third cleaning in the fifth solution for electrolysis for 5-10 minutes, and then clean the copper-aluminum composite metal after electrolysis with deionized water for the fourth time.

[0048] The fifth solution includes sulfuric acid, sodium dihydrogen phosphate, and graphite, and the temperature of the fifth solution is 18-21°C. During electrolysis, the copper-aluminum composite metal is used as the anode, graphite is used as the cathode, and the applied electrolysis voltage is 6-15V.

[0049] In this embodiment, each liter of the fifth solution contains 100-200 grams of sulfuric acid and 20-40 grams of sodium dihydrogen phosphate, with the remainder being water.

[0050] Step S5 uses an electrolytic reaction to generate uniformly distributed and sized nanopores in the copper-aluminum composite metal.

[0051] Step S6: Immerse the copper-aluminum composite metal after the fourth cleaning in the sixth solution for 5-10 minutes, and then clean the copper-aluminum composite metal for the fifth time with deionized water.

[0052] The sixth solution comprises sulfuric acid, hydrogen peroxide, and ethylenediaminetetramethylenephosphonic acid, and the temperature of the sixth solution is 30-50°C.

[0053] In this embodiment, each liter of the sixth solution contains 40-60 grams of the sulfuric acid, 5-10 grams of the hydrogen peroxide, and 5-10 grams of the ethylenediaminetetramethylenephosphonic acid, with the remainder being water.

[0054] Step S6 expands and protects the nanopores on the surface of the copper-aluminum composite metal to prevent oxidation.

[0055] Step S7: Dry the copper-aluminum composite metal after the fifth cleaning.

[0056] In this embodiment, the copper-aluminum composite metal after the fifth cleaning is dried in an oven; the temperature inside the oven is 100°C and the baking time is 10 minutes.

[0057] Step S7, also known as baking, protects the copper-aluminum composite metal packaging after the processing in steps S1-S6.

[0058] Step S8: The dried copper-aluminum composite metal is bonded to plastic by injection molding.

[0059] In this embodiment, the step of bonding the dried copper-aluminum composite metal with plastic by injection molding is as follows: the dried copper-aluminum composite metal is placed into an injection mold as a metal insert, and then the copper-aluminum composite metal placed in the injection mold is bonded with plastic by injection molding.

[0060] The plastic is any one of polyphenylene sulfide (PPS), saturated polyester butyl terephthalate (PBT), polyamide (PA), and acrylonitrile-butadiene-styrene copolymer (ABS).

[0061] Step S8, also known as injection molding, is a process in which the plastic is tightly bonded to the copper-aluminum composite metal.

[0062] Compared with the prior art, the present invention involves immersing the copper-aluminum composite metal in a first solution for 5-10 minutes, then rinsing the copper-aluminum composite metal with deionized water; immersing the copper-aluminum composite metal in a second solution for 1-5 minutes; immersing the copper-aluminum composite metal in a third solution for 1-2 minutes, then rinsing the copper-aluminum composite metal with deionized water; immersing the copper-aluminum composite metal in a fourth solution for 1-3 minutes, and then... The completed copper-aluminum composite metal is then cleaned a third time with deionized water. After the third cleaning, the copper-aluminum composite metal is immersed in a fifth solution for electrolysis for 5-10 minutes, followed by a fourth cleaning with deionized water. After the fourth cleaning, the copper-aluminum composite metal is immersed in a sixth solution for 5-10 minutes, followed by a fifth cleaning with deionized water. After the fifth cleaning, the copper-aluminum composite metal is dried. Finally, the dried copper-aluminum composite metal is bonded to plastic via injection molding. This allows copper-aluminum composite metals and plastics to be better applied to electronic appliances and battery energy products, improving the electrical performance and strength requirements of the products, making them lighter and more reliable. The manufacturing process is simpler, shorter, with a wider range of process parameters, high production feasibility, and stable product quality. The uniformly distributed nanopores of the copper-aluminum composite metal are filled by the plastic through injection molding, greatly strengthening the bonding strength of the composite. This prevents cracking and air leakage in the copper-aluminum composite metal and plastics due to insufficient local bonding strength under pressure. Furthermore, the protected nanopores will not fail due to self-oxidation or other factors within 6 months. This long shelf life completely eliminates product defects and losses caused by untimely injection molding during production. In production, various factors often prevent immediate injection molding after surface treatment; this long shelf life effectively ensures the stability and excellent quality of the copper-aluminum composite metal and plastics composite material.

[0063] To better illustrate the technical effects achieved by the embodiments of the present invention, four specific embodiments will be described in detail below, wherein the dimensions of the copper-aluminum composite metal are all 45mm. 18mm 2.0mm. Specific Implementation Example 1

[0065] Step S1: Immerse the copper-aluminum composite metal in the first solution for 8 minutes, and then clean the copper-aluminum composite metal with deionized water for the first time after immersion.

[0066] The temperature of the first solution is 60°C, and each liter of the first solution contains 15 grams of the sodium carbonate, 15 grams of the sodium tripolyphosphate, 5 grams of the borax, 3 grams of the isomeric decacarbonyl polyoxyethylene 7 ether, and 2 grams of the coconut oil fatty acid diethanolamide, with the remainder being water.

[0067] Step S2: Immerse the copper-aluminum composite metal after the first cleaning in the second solution for 3 minutes.

[0068] The temperature of the second solution is 30°C, and each liter of the second solution contains 20 grams of the sulfuric acid, 3 grams of the ammonium fluoride, 25 grams of the ammonium chloride, and 2 grams of the benzotriazole, with the remainder being water.

[0069] Step S3: After soaking in the second solution, immerse the copper-aluminum composite metal in the third solution for 2 minutes, and then clean the copper-aluminum composite metal a second time with deionized water.

[0070] The temperature of the third solution is 50°C, and each liter of the third solution contains 35 grams of sodium hydroxide, 15 grams of sodium carbonate, 4 grams of disodium ethylenediaminetetraacetate, and 3 grams of sodium molybdate, with the remainder being water.

[0071] Step S4: Immerse the copper-aluminum composite metal after the second cleaning in the fourth solution for 2 minutes, and then clean the copper-aluminum composite metal for the third time with deionized water.

[0072] The fourth solution is at a temperature of 30°C, and each liter of the fourth solution contains 45 grams of nitric acid, 7 grams of hydrofluoric acid, 35 grams of ferric sulfate, and the remainder is water.

[0073] Step S5: Immerse the copper-aluminum composite metal after the third cleaning in the fifth solution for electrolysis for 8 minutes, and then clean the copper-aluminum composite metal after electrolysis with deionized water for the fourth time.

[0074] The temperature of the fifth solution is 19°C; during electrolysis, the copper-aluminum composite metal is used as the anode, graphite is used as the cathode, the electrolysis voltage is 10V, and each liter of the fifth solution contains 150 grams of sulfuric acid and 30 grams of sodium dihydrogen phosphate, with the remainder being water.

[0075] Step S6: Immerse the copper-aluminum composite metal after the fourth cleaning in the sixth solution for 7 minutes, and then clean the copper-aluminum composite metal for the fifth time with deionized water.

[0076] The sixth solution is at a temperature of 40°C, and each liter of the sixth solution contains 50 grams of sulfuric acid, 8 grams of hydrogen peroxide, and 8 grams of ethylenediaminetetramethylenephosphonic acid, with the remainder being water.

[0077] Step S7: Dry the copper-aluminum composite metal after the fifth cleaning.

[0078] After the fifth cleaning, the copper-aluminum composite metal is dried in an oven at 100°C for 10 minutes.

[0079] Step S8: The dried copper-aluminum composite metal is bonded to plastic by injection molding. The dried copper-aluminum composite metal part is placed as a metal insert into the injection mold and tightly bonded to polyphenylene sulfide (PPS) through injection molding. Specific Implementation Example 2

[0081] Step S1: Immerse the copper-aluminum composite metal in the first solution for 8 minutes, and then clean the copper-aluminum composite metal with deionized water for the first time after immersion.

[0082] The temperature of the first solution is 60°C, and each liter of the first solution contains 15 grams of the sodium carbonate, 15 grams of the sodium tripolyphosphate, 5 grams of the borax, 3 grams of the isomeric decacarbonyl polyoxyethylene 7 ether, and 2 grams of the coconut oil fatty acid diethanolamide, with the remainder being water.

[0083] Step S2: Immerse the copper-aluminum composite metal after the first cleaning in the second solution for 3 minutes.

[0084] The temperature of the second solution is 30°C, and each liter of the second solution contains 20 grams of the sulfuric acid, 3 grams of the ammonium fluoride, 25 grams of the ammonium chloride, and 2 grams of the benzotriazole, with the remainder being water.

[0085] Step S3: After soaking in the second solution, immerse the copper-aluminum composite metal in the third solution for 2 minutes, and then clean the copper-aluminum composite metal a second time with deionized water.

[0086] The temperature of the third solution is 50°C, and each liter of the third solution contains 35 grams of sodium hydroxide, 15 grams of sodium carbonate, 4 grams of disodium ethylenediaminetetraacetate, and 3 grams of sodium molybdate, with the remainder being water.

[0087] Step S4: Immerse the copper-aluminum composite metal after the second cleaning in the fourth solution for 2 minutes, and then clean the copper-aluminum composite metal for the third time with deionized water.

[0088] The fourth solution is at a temperature of 30°C, and each liter of the fourth solution contains 45 grams of nitric acid, 7 grams of hydrofluoric acid, 35 grams of ferric sulfate, and the remainder is water.

[0089] Step S5: Immerse the copper-aluminum composite metal after the third cleaning in the fifth solution for electrolysis for 8 minutes, and then clean the copper-aluminum composite metal after electrolysis with deionized water for the fourth time.

[0090] The temperature of the fifth solution is 19°C; during electrolysis, the copper-aluminum composite metal is used as the anode, graphite is used as the cathode, the electrolysis voltage is 10V, and each liter of the fifth solution contains 150 grams of sulfuric acid and 30 grams of sodium dihydrogen phosphate, with the remainder being water.

[0091] Step S6: Immerse the copper-aluminum composite metal after the fourth cleaning in the sixth solution for 7 minutes, and then clean the copper-aluminum composite metal for the fifth time with deionized water.

[0092] The sixth solution is at a temperature of 40°C, and each liter of the sixth solution contains 50 grams of sulfuric acid, 8 grams of hydrogen peroxide, and 8 grams of ethylenediaminetetramethylenephosphonic acid, with the remainder being water.

[0093] Step S7: Dry the copper-aluminum composite metal after the fifth cleaning.

[0094] After the fifth cleaning, the copper-aluminum composite metal is dried in an oven at 100°C for 10 minutes.

[0095] Step S8: The dried copper-aluminum composite metal is bonded to plastic via injection molding. The dried copper-aluminum composite metal part is placed as a metal insert into the injection mold and tightly bonded to polyphenylene sulfide (PPS) through injection molding. The resulting composite material is then sealed and stored for 6 months. Specific Implementation Example 3

[0097] Step S1: Immerse the copper-aluminum composite metal in the first solution for 8 minutes, and then clean the copper-aluminum composite metal with deionized water for the first time after immersion.

[0098] The temperature of the first solution is 60°C, and each liter of the first solution contains 15 grams of the sodium carbonate, 15 grams of the sodium tripolyphosphate, 5 grams of the borax, 3 grams of the isomeric decacarbonyl polyoxyethylene 7 ether, and 2 grams of the coconut oil fatty acid diethanolamide, with the remainder being water.

[0099] Step S2: Immerse the copper-aluminum composite metal after the first cleaning in the second solution for 3 minutes.

[0100] The temperature of the second solution is 30°C, and each liter of the second solution contains 20 grams of the sulfuric acid, 3 grams of the ammonium fluoride, 25 grams of the ammonium chloride, and 2 grams of the benzotriazole, with the remainder being water.

[0101] Step S3: After soaking in the second solution, immerse the copper-aluminum composite metal in the third solution for 2 minutes, and then clean the copper-aluminum composite metal a second time with deionized water.

[0102] The temperature of the third solution is 50°C, and each liter of the third solution contains 35 grams of sodium hydroxide, 15 grams of sodium carbonate, 4 grams of disodium ethylenediaminetetraacetate, and 3 grams of sodium molybdate, with the remainder being water.

[0103] Step S4: Immerse the copper-aluminum composite metal after the second cleaning in the fourth solution for 2 minutes, and then clean the copper-aluminum composite metal for the third time with deionized water.

[0104] The fourth solution is at a temperature of 30°C, and each liter of the fourth solution contains 45 grams of nitric acid, 7 grams of hydrofluoric acid, 35 grams of ferric sulfate, and the remainder is water.

[0105] Step S5: Immerse the copper-aluminum composite metal after the third cleaning in the fifth solution for electrolysis for 8 minutes, and then clean the copper-aluminum composite metal after electrolysis with deionized water for the fourth time.

[0106] The temperature of the fifth solution is 19°C; during electrolysis, the copper-aluminum composite metal is used as the anode, graphite is used as the cathode, the electrolysis voltage is 10V, and each liter of the fifth solution contains 150 grams of sulfuric acid and 30 grams of sodium dihydrogen phosphate, with the remainder being water.

[0107] Step S6: Immerse the copper-aluminum composite metal after the fourth cleaning in the sixth solution for 7 minutes, and then clean the copper-aluminum composite metal for the fifth time with deionized water.

[0108] The sixth solution is at a temperature of 40°C, and each liter of the sixth solution contains 50 grams of sulfuric acid, 8 grams of hydrogen peroxide, and 8 grams of ethylenediaminetetramethylenephosphonic acid, with the remainder being water.

[0109] Step S7: Dry the copper-aluminum composite metal after the fifth cleaning.

[0110] After the fifth cleaning, the copper-aluminum composite metal is dried in an oven at 100°C for 10 minutes.

[0111] The dried copper-aluminum composite metal was stored for 6 months.

[0112] Step S8: The copper-aluminum composite metal, after being dried and left to stand for six months, is laminated with plastic. The dried copper-aluminum composite metal part is placed into an injection mold as a metal insert and tightly bonded to polyphenylene sulfide (PPS) through injection molding. Specific Implementation Example 4

[0114] Step S1: Immerse the copper-aluminum composite metal in the first solution for 8 minutes, and then clean the copper-aluminum composite metal with deionized water for the first time after immersion.

[0115] The temperature of the first solution is 60°C, and each liter of the first solution contains 15 grams of the sodium carbonate, 15 grams of the sodium tripolyphosphate, 5 grams of the borax, 3 grams of the isomeric decacarbonyl polyoxyethylene 7 ether, and 2 grams of the coconut oil fatty acid diethanolamide, with the remainder being water.

[0116] Step S2: Immerse the copper-aluminum composite metal after the first cleaning in the second solution for 3 minutes.

[0117] The temperature of the second solution is 30°C, and each liter of the second solution contains 20 grams of the sulfuric acid, 3 grams of the ammonium fluoride, 25 grams of the ammonium chloride, and 2 grams of the benzotriazole, with the remainder being water.

[0118] Step S3: After soaking in the second solution, immerse the copper-aluminum composite metal in the third solution for 2 minutes, and then clean the copper-aluminum composite metal a second time with deionized water.

[0119] The temperature of the third solution is 50°C, and each liter of the third solution contains 35 grams of sodium hydroxide, 15 grams of sodium carbonate, 4 grams of disodium ethylenediaminetetraacetate, and 3 grams of sodium molybdate, with the remainder being water.

[0120] Step S4: Immerse the copper-aluminum composite metal after the second cleaning in the fourth solution for 2 minutes, and then clean the copper-aluminum composite metal for the third time with deionized water.

[0121] The fourth solution is at a temperature of 30°C, and each liter of the fourth solution contains 45 grams of nitric acid, 7 grams of hydrofluoric acid, 35 grams of ferric sulfate, and the remainder is water.

[0122] Step S5: Immerse the copper-aluminum composite metal after the third cleaning in the fifth solution for electrolysis for 8 minutes, and then clean the copper-aluminum composite metal after electrolysis with deionized water for the fourth time.

[0123] The temperature of the fifth solution is 19°C; during electrolysis, the copper-aluminum composite metal is used as the anode, graphite is used as the cathode, the electrolysis voltage is 10V, and each liter of the fifth solution contains 150 grams of sulfuric acid and 30 grams of sodium dihydrogen phosphate, with the remainder being water.

[0124] Step S6: Immerse the copper-aluminum composite metal after the fourth cleaning in the sixth solution for 7 minutes, and then clean the copper-aluminum composite metal for the fifth time with deionized water.

[0125] The sixth solution is at a temperature of 40°C, and each liter of the sixth solution contains 50 grams of sulfuric acid, 8 grams of hydrogen peroxide, and 8 grams of ethylenediaminetetramethylenephosphonic acid, with the remainder being water.

[0126] Step S7: Dry the copper-aluminum composite metal after the fifth cleaning.

[0127] After the fifth cleaning, the copper-aluminum composite metal is dried in an oven at 100°C for 10 minutes.

[0128] Step S8: The dried copper-aluminum composite metal is bonded to plastic by injection molding. The dried copper-aluminum composite metal part is placed into the injection mold as a metal insert and tightly bonded to polyphenylene sulfide (PPS) through injection molding. The resulting composite material product is sealed and packaged for 6 months.

[0129] To better illustrate the specific parameters and technical effects of the four specific embodiments described above, the following will provide a detailed description of the four specific embodiments through four tables.

[0130] Table 1: Material list for the four specific embodiments described above

[0131]

[0132] Table 2: Parameter conditions used in the four specific embodiments above

[0133]

[0134] Table 3: Separation Test Results of the Four Specific Embodiments Above

[0135]

[0136] Table 4: Air tightness test results of the four specific embodiments above

[0137]

[0138] As can be seen from the results of the above specific embodiments 1 to 4, the copper-aluminum composite metal parts plastic composite body prepared by the surface treatment method of the present invention significantly improves the bonding strength between the copper-aluminum composite metal parts and the plastic. Furthermore, the following beneficial effects can be obtained from the results of specific embodiments 1 to 4:

[0139] 1. The surface treatment method for metal parts of the present invention has a simple process, a simple process flow and a wide range of parameter conditions. The entire process is completed in about 20 minutes, which greatly increases the output compared with other processes. The wide range of parameter conditions makes the process more stable.

[0140] 2. As can be seen from Examples 1 to 4, the preparation method proposed in this invention is applicable to copper-aluminum composite metals.

[0141] 3. Comparing Specific Embodiment 1 and Specific Embodiment 3, the copper-aluminum composite metal parts treated by the surface treatment method of the present invention show no weakening of the bonding strength between the injection molded metal and the plastic after 6 months of storage. This indicates that the surface treatment method of the present invention has a long service life, avoiding failure losses caused by storage during production. The test data comparing Embodiments 1 and 2, and 3 and 4, show that the copper-aluminum composite metal treated by the present invention has high stability in bonding strength with plastic, with no significant weakening over a long period.

[0142] 4. Please refer to Figure 2 , Figure 2 This is a schematic diagram of the microstructure of the copper-aluminum composite metal surface after step S6 processing, as provided in this embodiment of the invention. Figure 2 It is known that the copper or copper alloy surface treated by the method of the present invention has densely and uniformly distributed holes with a complex structure. These holes are filled by injection molding plastic, and after cooling, countless riveting structures are formed between the copper-aluminum composite metal part and the plastic. This is the reason why the composite part can pass the airtightness test because it is firmly bonded.

[0143] In summary, the results of specific embodiments 1 to 4 verify that the surface treatment method of the present invention and the copper-aluminum composite metal parts plastic composite have high bonding strength, high product reliability, and high production efficiency.

[0144] Implementation Method 2

[0145] This invention also provides a composite material of copper-aluminum composite metal and plastic, which is prepared by the aforementioned method for preparing a composite material of copper-aluminum composite metal and plastic. Since the composite material of copper-aluminum composite metal and plastic in this embodiment is prepared by the composite preparation method of copper-aluminum composite metal and plastic in Embodiment 1, the composite material of copper-aluminum composite metal and plastic in this embodiment can also achieve the technical effects achieved by the composite preparation method of copper-aluminum composite metal and plastic in Embodiment 1, and will not be elaborated further here.

[0146] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0147] The embodiments of the present invention have been described above with reference to the accompanying drawings. The disclosed embodiments are merely preferred embodiments of the present invention. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many equivalent changes in form without departing from the spirit and scope of the claims of the present invention, and all such changes are within the protection scope of the present invention.

Claims

1. A method for preparing a composite material of copper-aluminum composite metal and plastic, characterized in that, The method for preparing the composite material includes the following steps: Step S1: Immerse the copper-aluminum composite metal in the first solution for 5-10 minutes, and then rinse the copper-aluminum composite metal with deionized water for the first time after immersion; wherein, the first solution comprises the following components: each liter of the first solution contains 10-20 grams of sodium carbonate, 10-20 grams of sodium tripolyphosphate, 3-8 grams of borax, 1-5 grams of isomeric decacarbonyl alcohol polyoxyethylene 7 ether and 1-2 grams of coconut oil fatty acid diethanolamide, with the remainder being water, and the temperature of the first solution is 55-65℃; Step S2: Immerse the copper-aluminum composite metal after the first cleaning in the second solution for 1-5 minutes; wherein the second solution comprises the following components: each liter of the second solution contains 15-25 grams of sulfuric acid, 1-4 grams of ammonium bifluoride, 20-30 grams of ammonium chloride and 1-2 grams of benzotriazole, with the remainder being water, and the temperature of the second solution is 20-35°C; Step S3: Immerse the copper-aluminum composite metal, which has been soaked in the second solution, in the third solution for 1-2 minutes, and then rinse the copper-aluminum composite metal a second time with deionized water. The third solution comprises the following components: each liter of the third solution contains 30-40 grams of sodium hydroxide, 10-20 grams of sodium carbonate, 2-5 grams of disodium ethylenediaminetetraacetate, and 2-5 grams of sodium molybdate, with the remainder being water. The temperature of the third solution is 45-65°C. Step S4: Immerse the copper-aluminum composite metal after the second cleaning in the fourth solution for 1-3 minutes, and then clean the copper-aluminum composite metal for the third time with deionized water; wherein, the fourth solution comprises the following components: each liter of the fourth solution contains 30-60 grams of nitric acid, 5-10 grams of hydrofluoric acid, 30-40 grams of ferric sulfate, and the remainder is water, and the temperature of the fourth solution is 25-35℃; Step S5: Immerse the copper-aluminum composite metal after the third cleaning in the fifth solution for electrolysis for 5-10 minutes, and then clean the copper-aluminum composite metal after electrolysis with deionized water for the fourth time; wherein, the fifth solution comprises the following components: each liter of the fifth solution contains 100-200 grams of sulfuric acid and 20-40 grams of sodium dihydrogen phosphate, with the remainder being water, and the temperature of the fifth solution is 18-21℃; during electrolysis, the copper-aluminum composite metal is used as the anode, graphite is used as the cathode, and the applied electrolysis voltage is 6-15V; Step S6: Immerse the copper-aluminum composite metal after the fourth cleaning in the sixth solution for 5-10 minutes, and then clean the copper-aluminum composite metal for the fifth time with deionized water; wherein, the sixth solution comprises the following components: each liter of the sixth solution contains 40-60 grams of sulfuric acid, 5-10 grams of hydrogen peroxide and 5-10 grams of ethylenediaminetetramethylenephosphonic acid, with the remainder being water, and the temperature of the sixth solution is 30-50℃; Step S7: Dry the copper-aluminum composite metal after the fifth cleaning. Step S8: The dried copper-aluminum composite metal is bonded to a plastic by injection molding. The plastic is any one of polyphenylene sulfide, saturated polyester terephthalate, polyamide, and acrylonitrile-butadiene-styrene copolymer.

2. The method for preparing a copper-aluminum composite metal and plastic composite material as described in claim 1, characterized in that, In step S7, the copper-aluminum composite metal after the fifth cleaning is dried in an oven; the temperature inside the oven is 100°C and the baking time is 10 minutes.

3. The method for preparing a copper-aluminum composite metal and plastic composite material as described in claim 1, characterized in that, In step S8, the step of bonding the dried copper-aluminum composite metal with plastic by injection molding is specifically as follows: the dried copper-aluminum composite metal is placed into the injection mold as a metal insert, and then the copper-aluminum composite metal placed in the injection mold is bonded with plastic by injection molding.

4. A composite material of copper-aluminum composite metal and plastic, characterized in that, The copper-aluminum composite metal and plastic composite material is prepared by the method for preparing the copper-aluminum composite metal and plastic composite material according to any one of claims 1 to 3.

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