Aluminum coil double-sided anodic oxidation process

Abstract

The invention discloses a roll aluminum double-sided anodic oxidation process, which is characterized in that an anodic oxidation electrolyte is composed of sulfuric acid, aluminum ions and water, the concentration of the sulfuric acid in the electrolyte is 18% / L, the concentration of the aluminum ions in the electrolyte is 0.05% / L, and the balance is water; the process comprises the following steps: step a, coiling and aluminum surface wire drawing; step b, carrying out oil removal operation by using acidic oil removal water; c, a finished product obtained after oil removal is subjected to cleaning operation; d, the cleaned finished product is put into an electrolyte for anodic oxidation electrolysis; e, the electrolysis finished product in the step d is cleaned and blow-dried; and f, the blow-dried finished product is rolled. The process is simple, the processing efficiency is improved, the quality of the aluminum-based copper-clad plate is improved, a layer of compact and insulating oxidation film is generated on the aluminum surface, higher surface protection performance is given, the uniformity of anodic oxidation is improved, the production cost is improved, the applicability is high, and the practicability is good.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum-based copper coating, and in particular relates to a double-sided anodizing process for rolled aluminum. Background Art

[0002] Aluminum-based copper-clad laminate is a plate-like material belonging to the aluminum substrate. It is made of electronic fiberglass cloth or other reinforcing materials impregnated with resin, covered with copper foil on the surface and hot-pressed. It is usually called copper-clad laminate, abbreviated as aluminum-based copper-clad laminate. It can be widely used in high-power, high-heat dissipation electronic products such as vehicle-mounted igniters and variable-frequency power supplies.

[0003] However, the performance of aluminum substrates in the prior art is not ideal. In order to solve the above defects, it is necessary to use anodizing technology to strengthen the surface of aluminum and aluminum alloys, expand the application range of aluminum and aluminum alloys, and extend their service life. However, the prior art processing process is not only inconvenient to operate, but also has uneven oxidation thickness, which reduces the voltage resistance performance of the aluminum substrate, and its practicality is limited. Summary of the invention

[0004] The purpose of the present invention is to provide a double-sided anodizing process for aluminum coils which has strong applicability and is conducive to reducing costs.

[0005] The technical solution to achieve the purpose of the present invention is a double-sided anodizing process for aluminum coils, wherein the anodizing electrolyte is composed of sulfuric acid, aluminum ions and water, wherein the concentration of sulfuric acid in the electrolyte is 18% / L, the concentration of aluminum ions in the electrolyte is 0.5‰ / L, and the rest is water;

[0006] The process includes the following steps: step a, rolling and aluminum surface drawing;

[0007] Step b, using acidic degreasing water to perform degreasing operation;

[0008] Step c, cleaning the finished product after degreasing;

[0009] Step d, placing the cleaned finished product into an electrolyte for anodizing electrolysis;

[0010] Step e, cleaning and drying the electrolytic product of step d;

[0011] Step f, rolling up the finished product after drying.

[0012] It is further preferred that: the acidic oil-removing water is composed of polyquaternary ammonium salt, OP emulsifier and water;

[0013] The polyquaternary ammonium salt accounts for 20% of the total mass of the acidic deoiled water, the OP emulsifier accounts for 30% of the total mass of the acidic deoiled water, and the rest is water.

[0014] More preferably, the pH value of the electrolyte is 2.0-2.8.

[0015] More preferably, the temperature of the electrolyte is 20° C.-35° C., and the time is 40 to 65 minutes.

[0016] More preferably, the pH value of the acidic deoiling water is 4-6.

[0017] The present invention has positive effects: the process of the present invention is simple, which is conducive to improving processing efficiency and improving the quality of aluminum-based copper-clad laminates, and is conducive to generating a dense and insulating oxide film on the aluminum surface. Moreover, while perfectly retaining the natural and soft metallic texture of aluminum, it also gives it higher surface protection performance and will not fall off. At the same time, it is also conducive to improving the uniformity of anodizing, which is conducive to improving production costs, and has strong applicability and good practicality. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example

[0020] A double-sided anodizing process for aluminum coils, wherein the anodizing electrolyte is composed of sulfuric acid, aluminum ions and water, wherein the concentration of sulfuric acid in the electrolyte is 18% / L, the concentration of aluminum ions in the electrolyte is 0.5‰ / L, and the rest is water;

[0021] The process includes the following steps: step a, rolling and aluminum surface drawing;

[0022] Step b, using acidic degreasing water to perform degreasing operation;

[0023] Step c, cleaning the finished product after degreasing;

[0024] Step d, placing the cleaned finished product into an electrolyte for anodizing electrolysis;

[0025] Step e, cleaning and drying the electrolytic product of step d;

[0026] Step f, rolling up the finished product after drying.

[0027] It is further preferred that: the acidic oil-removing water is composed of polyquaternary ammonium salt, OP emulsifier and water;

[0028] The polyquaternary ammonium salt accounts for 20% of the total mass of the acidic deoiled water, the OP emulsifier accounts for 30% of the total mass of the acidic deoiled water, and the rest is water.

[0029] More preferably, the pH value of the electrolyte is 2.0-2.8.

[0030] More preferably, the temperature of the electrolyte is 20° C.-35° C., and the time is 40 to 65 minutes.

[0031] More preferably, the pH value of the acidic deoiling water is 4-6.

[0032] The present invention has positive effects: the process of the present invention is simple, which is conducive to improving processing efficiency and improving the quality of aluminum-based copper-clad laminates, and is conducive to generating a dense and insulating oxide film on the aluminum surface. Moreover, while perfectly retaining the natural and soft metallic texture of aluminum, it also gives it higher surface protection performance and will not fall off. At the same time, it is also conducive to improving the uniformity of anodizing, which is conducive to improving production costs, and has strong applicability and good practicality.

[0033] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification can also be directly processed according to existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0034] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A double-sided anodizing process for aluminum coils, characterized in that: The electrolyte for anodization is composed of sulfuric acid, aluminum ions and water, wherein the concentration of sulfuric acid in the electrolyte is 18% / L, the concentration of aluminum ions in the electrolyte is 0.5‰ / L, and the rest is water; The process includes the following steps: step a, rolling and aluminum surface drawing; Step b, using acidic degreasing water to perform degreasing operation; Step c, cleaning the finished product after degreasing; Step d, placing the cleaned finished product into an electrolyte for anodizing electrolysis; Step e, cleaning and drying the electrolytic product of step d; Step f, rolling up the finished product after drying.

2. A double-sided anodizing process for aluminum coil according to claim 1, characterized in that: The acidic degreasing water is composed of polyquaternary ammonium salt, OP emulsifier and water; The polyquaternary ammonium salt accounts for 20% of the total mass of the acidic deoiled water, the OP emulsifier accounts for 30% of the total mass of the acidic deoiled water, and the rest is water.

3. The double-sided anodizing process of aluminum coil according to claim 1, characterized in that: The pH value of the electrolyte is 2.0-2.

8.

4. The double-sided anodizing process for aluminum coil according to claim 1, characterized in that: The temperature of the electrolyte is 20°C-35°C, and the time is 40-65 minutes.

5. The double-sided anodizing process of aluminum coil according to claim 1, characterized in that: The pH value of the acidic deoiling water is 4-6.