CN114434100B - Treatment method of aluminum alloy blank, aluminum alloy blank and application - Google Patents
Treatment method of aluminum alloy blank, aluminum alloy blank and application Download PDFInfo
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- CN114434100B CN114434100B CN202210053113.2A CN202210053113A CN114434100B CN 114434100 B CN114434100 B CN 114434100B CN 202210053113 A CN202210053113 A CN 202210053113A CN 114434100 B CN114434100 B CN 114434100B
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Abstract
The invention discloses a processing method of an aluminum alloy blank, an aluminum alloy blank and application, wherein the method comprises the following steps: providing a pretreated aluminum alloy blank; placing the aluminum alloy blank in an acidic corrosive liquid, and carrying out anodic oxidation treatment on the aluminum alloy blank under a preset condition to form the aluminum alloy blank with an oxide layer; after the aluminum alloy blank with the oxide layer is subjected to ultrasonic water washing treatment, placing the aluminum alloy blank into dimethyl sulfoxide solution with a sulfonated substance under the preset condition for electrophoresis treatment to obtain the aluminum alloy blank with the sulfonated substance on the surface; and carrying out ultrasonic washing treatment on the aluminum alloy blank with the sulfonate again, and carrying out constant-temperature drying to obtain the aluminum alloy blank for nano injection molding. The invention can ensure that the aluminum alloy blank and the special engineering plastic have better compatibility and tighter binding force in the insert injection molding process.
Description
Technical Field
The invention relates to the technical field of metal treatment, in particular to a treatment method of an aluminum alloy blank, the aluminum alloy blank and application.
Background
The special engineering plastic is a kind of engineering plastic with high comprehensive performance and long-term use temperature over 150 ℃, has unique and excellent physical properties, and is mainly applied to high-tech fields such as electronics, electrics, special industries and the like. In the related technology, because the processing temperature of the metal anodic oxidation nanopore is not consistent with the processing temperature of the special engineering plastic, the processing agent can be decomposed under the processing temperature condition of the special engineering plastic, the compatibility between the processing agent and the special engineering plastic can be poor, and the insert injection molding bonding force between the special engineering plastic and the metal is insufficient.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, an object of the invention is to propose a method of treatment of an aluminium alloy blank, comprising:
providing a pretreated aluminum alloy blank;
placing the aluminum alloy blank in an acidic corrosive liquid, and carrying out anodic oxidation treatment on the aluminum alloy blank under a preset condition to form the aluminum alloy blank with an oxide layer;
after the aluminum alloy blank with the oxide layer is subjected to ultrasonic water washing treatment, placing the aluminum alloy blank into dimethyl sulfoxide solution with a sulfonated substance under the preset condition for electrophoresis treatment to obtain the aluminum alloy blank with the sulfonated substance on the surface;
and carrying out ultrasonic washing treatment on the aluminum alloy blank with the sulfonate again, and carrying out constant-temperature drying to obtain the aluminum alloy blank for nano injection molding.
Optionally, the pre-treatment of the aluminum alloy blank comprises:
carrying out sand blasting polishing on the aluminum alloy blank through a sand material with a preset particle size so as to remove a surface oxide layer of the aluminum alloy blank;
placing the aluminum alloy blank with the surface oxide layer removed into a deionized water solution for deoiling treatment; wherein the deoiling treatment temperature is 50-75 ℃, and the treatment time is 5-10 minutes;
and carrying out ultrasonic water washing treatment on the aluminum alloy blank after the deoiling treatment so as to finish the pretreatment operation of the aluminum alloy blank.
Optionally, the deionized water solution comprises 3-5wt% of sodium carbonate, 3-5wt% of trisodium phosphate and 1-3wt% of sodium silicate.
Optionally, the number of times of ultrasonic water washing is 3-4, the washing time is 2-3 minutes, and the frequency of ultrasonic waves is 100kHz.
Optionally, the acidic etching solution includes hydrochloric acid, sulfuric acid, and oxalic acid, where the ratio of the hydrochloric acid, the sulfuric acid, and the oxalic acid in percentage by mass is 3-3.5:2-2.5:0.5-1, and the acid content percentage in the acid corrosive liquid is 2-10wt%.
Alternatively, the predetermined conditions are a temperature of 30 + -5 deg.C, a current density of 500 + -50 mA/cm2, and ultrasonic treatment using 50 + -25 kHz with a treatment time of 3-10 minutes.
Optionally, the concentration of the dimethyl sulfoxide solution is 1-10wt%, and the sulfonate is one or more of sulfonated polysulfone (S-PSU), sulfonated polyethersulfone (S-PES), sulfonated polyphenylene sulfone (S-PPSU), sulfonated polyether ether ketone (S-PEEK), sulfonated polyether ketone (S-PEK), sulfonated polyether ketone (S-PEKK) and sulfonated polyether ketone ether ketone (S-PEKEKK).
Optionally, the thickness of the oxide layer is 10-50um.
A second object of the invention is to propose an aluminium alloy blank treated by the above-mentioned treatment method.
The third purpose of the invention is to provide the application of the aluminum alloy blank obtained by the treatment method in the composite gear.
The invention provides a method for processing an aluminum alloy blank, which comprises the steps of pretreating the aluminum alloy blank; placing the aluminum alloy blank in an acidic corrosive liquid, and carrying out anodic oxidation treatment on the aluminum alloy blank under a preset condition to form the aluminum alloy blank with an oxide layer; then, after the aluminum alloy blank with the oxide layer is subjected to ultrasonic water washing treatment, the aluminum alloy blank is placed into dimethyl sulfoxide solution with a sulfonate under the preset condition to be subjected to electrophoresis treatment, and the aluminum alloy blank with the sulfonate on the surface is obtained; and carrying out ultrasonic washing treatment on the aluminum alloy blank with the sulfonate again, and drying at constant temperature to obtain the aluminum alloy blank for nano injection molding. Therefore, in the insert injection molding process, the aluminum alloy blank and the special engineering plastic can be better fused, and the bonding force is tighter.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural view of an aluminum alloy blank provided in an embodiment of the invention;
fig. 2 is an enlarged view of a portion a shown in fig. 1.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and should not be construed as limiting the present invention, and all other embodiments that can be obtained by one skilled in the art based on the embodiments of the present invention without inventive efforts shall fall within the scope of protection of the present invention.
The treatment method of the aluminum alloy blank, the aluminum alloy blank and the application of the embodiment of the invention are described in detail below with reference to the accompanying drawings.
Referring to fig. 1 and 2, a method for treating an aluminum alloy blank provided in an embodiment of the present invention includes: a pretreated aluminum alloy blank is provided.
Specifically, the pretreatment of the aluminum alloy blank comprises the following steps:
firstly, performing sand blasting and polishing on an aluminum alloy blank through sand with a preset particle size to remove a surface oxide layer of the aluminum alloy blank;
secondly, placing the aluminum alloy blank with the surface oxide layer removed into a deionized water solution for deoiling treatment; wherein the deoiling treatment temperature is 50-75 ℃, and the treatment time is 5-10 minutes;
and step three, carrying out ultrasonic water washing treatment on the aluminum alloy blank after the deoiling treatment so as to finish the pretreatment operation of the aluminum alloy blank.
The predetermined grain size can be 400-600 meshes, the aluminum alloy blank can be made of an aluminum alloy material with a smooth and clean surface, for example, a 2 series, 5 series, 6 series and 7 series aluminum alloy material with high strength or high strength and fatigue resistance can be adopted, because the aluminum alloy can generate a surface oxidation layer in the air, the aluminum alloy blank can be subjected to sand blasting polishing by a sand blasting polishing machine, so that the surface oxidation layer of the aluminum alloy blank is polished and removed, after the surface oxidation layer is removed, the aluminum alloy blank can be put into a deionized water solution for deoiling treatment, the deoiling treatment can adopt 65 ℃, the treatment time can be 8 minutes, and after the deoiling treatment, the aluminum alloy blank can be repeatedly washed by an ultrasonic cleaner for 3 times, and the washing time can be 3 minutes each time, so that the aluminum alloy blank with a clean neutral surface and no oxidation layer can be obtained.
Optionally, the deionized water solution comprises 3-5wt% of sodium carbonate, 3-5wt% of trisodium phosphate and 1-3wt% of sodium silicate; and the ultrasonic washing is carried out 3-4 times for 2-3 minutes at 100kHz, and can be carried out by deionized water, which is pure water with impurities in ion form removed.
Referring to fig. 1 and 2, according to the method for processing an aluminum alloy blank provided by the present invention, the following first to sixth embodiments employ different conditions to obtain an aluminum alloy blank, and the overall processing process is comprehensively analyzed.
First embodiment
The method for treating an aluminum alloy blank provided in a first embodiment of the invention includes:
taking an aluminum alloy blank as an anode and graphite as a cathode, and putting the aluminum alloy blank into a furnace, wherein the aluminum alloy blank is prepared from hydrochloric acid, sulfuric acid and oxalic acid in a mass percentage ratio of 3:2: in 0.5 acid corrosive liquid, carrying out anodic oxidation treatment on the aluminum alloy blank at the temperature of 25 ℃ and the current density of 450mA/cm < 2 > by adopting 35kHz ultrasonic wave to form an oxide layer with the thickness of 45um and the aluminum alloy blank with nano-scale micropores on the surface;
placing an aluminum alloy blank with an oxide layer with the thickness of 45 mu m into a 100kHz ultrasonic cleaner, and carrying out ultrasonic water washing for 3 times through deionized water, wherein the time of each washing is 2 minutes;
after cleaning, putting the aluminum alloy blank into a dimethyl sulfoxide solution with a sulfonate and a concentration of 1.5wt%, taking the aluminum alloy blank as an anode and graphite as a cathode, and performing electrophoresis treatment at a temperature of 25 ℃ and a current density of 450mA/cm & lt 2 & gt and under 35kHz ultrasonic waves to obtain the aluminum alloy blank with the sulfonate on the surface;
putting the aluminum alloy blank with the sulfonate into an ultrasonic cleaner with 100kHz again, and carrying out ultrasonic water washing for 3 times by deionized water, wherein the time of each washing is 2 minutes;
after completion of the cleaning, the aluminum alloy blank was placed in a drying oven to be dried at a constant temperature of 200 ℃ for 20 minutes to obtain an aluminum alloy blank for nano injection molding.
Second embodiment
The method for treating an aluminum alloy blank provided in the second embodiment of the invention comprises the following steps:
taking an aluminum alloy blank as an anode and graphite as a cathode, and putting the aluminum alloy blank into a furnace, wherein the aluminum alloy blank is prepared from hydrochloric acid, sulfuric acid and oxalic acid according to the mass percentage of 3.2:2.4: in 0.7 acid corrosive liquid, carrying out anodic oxidation treatment on the aluminum alloy blank at the temperature of 25 ℃ and the current density of 450mA/cm < 2 > by adopting 35kHz ultrasonic wave to form an oxide layer with the thickness of 32um and the aluminum alloy blank with nano-scale micropores on the surface;
placing an aluminum alloy blank with an oxide layer with the thickness of 32 mu m into an ultrasonic cleaner with the thickness of 100kHz, and carrying out ultrasonic water washing for 3 times through deionized water, wherein the time of each washing is 2 minutes;
after cleaning, putting the aluminum alloy blank into a dimethyl sulfoxide solution with a sulfonating material and a concentration of 2.8wt%, taking the aluminum alloy blank as an anode and graphite as a cathode, and performing electrophoresis treatment at 35 ℃ and a current density of 550mA/cm & lt 2 & gt and under 75kHz ultrasonic waves to obtain the aluminum alloy blank with the sulfonating material on the surface;
putting the aluminum alloy blank with the sulfonate into an ultrasonic cleaner with 100kHz again, and carrying out ultrasonic water washing for 3 times by deionized water, wherein the time of each washing is 2 minutes;
after completion of the cleaning, the aluminum alloy blank was placed in a drying oven to be dried at a constant temperature of 200 ℃ for 20 minutes to obtain an aluminum alloy blank for nano injection molding.
Third embodiment
The method for treating an aluminum alloy blank provided in a third embodiment of the invention includes:
taking an aluminum alloy blank as an anode and graphite as a cathode, and putting the aluminum alloy blank into a furnace, wherein the aluminum alloy blank is prepared from hydrochloric acid, sulfuric acid and oxalic acid according to the mass percentage of 3.5:2.6: in 0.6 acid corrosive liquid, carrying out anodic oxidation treatment on the aluminum alloy blank at the temperature of 35 ℃ and the current density of 550mA/cm & lt 2 & gt under 55kHz ultrasonic wave to form an oxide layer with the thickness of 27 mu m and the aluminum alloy blank with nano-scale micropores on the surface;
placing an aluminum alloy blank with an oxide layer with the thickness of 27 microns into an ultrasonic cleaner with the frequency of 100kHz, and carrying out ultrasonic water washing for 3 times through deionized water, wherein the time of each washing is 2 minutes;
after cleaning, putting the aluminum alloy blank into 3.7wt% dimethyl sulfoxide solution with sulfonate, taking the aluminum alloy blank as an anode and graphite as a cathode, and performing electrophoresis treatment at 35 ℃ and 550mA/cm & lt 2 & gt and under 55kHz ultrasonic waves to obtain the aluminum alloy blank with the sulfonate on the surface;
putting the aluminum alloy blank with the sulfonate into an ultrasonic cleaner with 100kHz again, and carrying out ultrasonic water washing for 3 times by deionized water, wherein the time of each washing is 2 minutes;
after completion of the cleaning, the aluminum alloy blank was placed in a drying oven to be dried at a constant temperature of 200 ℃ for 20 minutes to obtain an aluminum alloy blank for nano injection molding.
Fourth embodiment
The method for treating an aluminum alloy blank provided in a fourth embodiment of the invention includes:
taking an aluminum alloy blank as an anode and graphite as a cathode, and putting the aluminum alloy blank into a reaction kettle, wherein the mass percentage of hydrochloric acid, sulfuric acid and oxalic acid is 3.3:2.1: in 0.8 acid corrosive liquid, carrying out anodic oxidation treatment on the aluminum alloy blank at the temperature of 25 ℃ and the current density of 450mA/cm & lt 2 & gt and under the ultrasonic wave of 35kHz to form an oxide layer with the thickness of 25 mu m and the aluminum alloy blank with nano-scale micropores on the surface;
placing an aluminum alloy blank with an oxide layer with the thickness of 25 mu m into an ultrasonic cleaner with the frequency of 100kHz, and carrying out ultrasonic water washing for 3 times through deionized water, wherein the time of each washing is 2 minutes;
after cleaning, putting the aluminum alloy blank into dimethyl sulfoxide solution with sulfonate and concentration of 4wt%, taking the aluminum alloy blank as an anode and graphite as a cathode, and performing electrophoresis treatment at 25 ℃ and current density of 450mA/cm & lt 2 & gt and under 35kHz ultrasonic wave to obtain the aluminum alloy blank with the sulfonate on the surface;
putting the aluminum alloy blank with the sulfonate into an ultrasonic cleaner with 100kHz again, and carrying out ultrasonic water washing for 3 times by deionized water, wherein the time of each washing is 2 minutes;
after the completion of the cleaning, the aluminum alloy blank was placed in a drying oven to be dried at a constant temperature of 200 ℃ for 20 minutes to obtain an aluminum alloy blank for nano injection molding.
Fifth embodiment
The method for treating an aluminum alloy blank provided in a fifth embodiment of the invention includes:
taking an aluminum alloy blank as an anode and graphite as a cathode, and putting the aluminum alloy blank into a furnace, wherein the aluminum alloy blank is prepared from hydrochloric acid, sulfuric acid and oxalic acid according to the mass percentage of 3.1:2.3: in 0.9 acid corrosive liquid, carrying out anodic oxidation treatment on the aluminum alloy blank at the temperature of 35 ℃ and the current density of 550mA/cm & lt 2 & gt and under the ultrasonic wave of 75kHz to form an oxide layer with the thickness of 18um and the aluminum alloy blank with nano-scale micropores on the surface;
placing an aluminum alloy blank with an oxide layer with the thickness of 18 mu m into an ultrasonic cleaner with the frequency of 100kHz, and carrying out ultrasonic water washing for 3 times by deionized water, wherein the time of each washing is 2 minutes;
after cleaning, putting the aluminum alloy blank into dimethyl sulfoxide solution with sulfonate and concentration of 4wt%, taking the aluminum alloy blank as an anode and graphite as a cathode, and performing electrophoresis treatment at 35 ℃ and current density of 550mA/cm & lt 2 & gt and under 75kHz ultrasonic waves to obtain the aluminum alloy blank with the sulfonate on the surface;
putting the aluminum alloy blank with the sulfonate into an ultrasonic cleaner with 100kHz again, and carrying out ultrasonic water washing for 3 times by deionized water, wherein the time of each washing is 2 minutes;
after completion of the cleaning, the aluminum alloy blank was placed in a drying oven to be dried at a constant temperature of 200 ℃ for 20 minutes to obtain an aluminum alloy blank for nano injection molding.
Sixth embodiment
The method for treating an aluminum alloy blank provided in a sixth embodiment of the invention includes:
taking an aluminum alloy blank as an anode and graphite as a cathode, and putting the aluminum alloy blank into a furnace, wherein the aluminum alloy blank is prepared from hydrochloric acid, sulfuric acid and oxalic acid according to the mass percentage of 3.5:2.5:1, carrying out anodic oxidation treatment on the aluminum alloy blank at the temperature of 35 ℃ and the current density of 550mA/cm & lt 2 & gt by adopting 75kHz ultrasonic waves to form an oxide layer with the thickness of 13 mu m and the aluminum alloy blank with nano-scale micropores formed on the surface;
placing an aluminum alloy blank with an oxide layer with the thickness of 13 mu m into a 100kHz ultrasonic cleaner, and carrying out ultrasonic water washing for 3 times through deionized water, wherein the time of each washing is 2 minutes;
after cleaning, placing the aluminum alloy blank into a dimethyl sulfoxide solution with a sulfonate and a concentration of 2wt%, taking the aluminum alloy blank as an anode and graphite as a cathode, and performing electrophoresis treatment at a temperature of 35 ℃ and a current density of 550mA/cm & lt 2 & gt and under 75kHz ultrasonic waves to obtain the aluminum alloy blank with the sulfonate on the surface;
putting the aluminum alloy blank with the sulfonate into an ultrasonic cleaner with 100kHz again, and carrying out ultrasonic water washing for 3 times by deionized water, wherein the time of each washing is 2 minutes;
after completion of the cleaning, the aluminum alloy blank was placed in a drying oven to be dried at a constant temperature of 200 ℃ for 20 minutes to obtain an aluminum alloy blank for nano injection molding.
As can be seen from the above first to sixth embodiments, the oxide layer is formed to be thinner and the nanopores are formed to be larger as the ratio of the acidic etchant is higher, and the oxide layer is formed to be thicker and the nanopores are formed to be smaller as the ratio of the acidic etchant is lower; and the higher the concentration of the dimethyl sulfoxide solution of the sulfonated substance is, the more stable the bonding force of the sulfonated substance permeated into the nano micropores of the aluminum alloy blank is, and the bonding force is tighter when the sulfonated substance is used for nano injection molding.
Optionally, the sulfonate is a mixture of one or more of sulfonated polysulfone (S-PSU), sulfonated polyethersulfone (S-PES), sulfonated polyphenylsulfone (S-PPSU), sulfonated polyetheretherketone (S-PEEK), sulfonated polyetherketone (S-PEK), sulfonated polyetherketoneketone (S-PEKK), and sulfonated polyetherketoneketoneketone (S-PEKEKK).
The invention provides a method for processing an aluminum alloy blank, which comprises the steps of pretreating the aluminum alloy blank; placing the aluminum alloy blank in an acidic corrosive liquid, and carrying out anodic oxidation treatment on the aluminum alloy blank under a preset condition to form the aluminum alloy blank with an oxide layer; then, after the aluminum alloy blank with the oxide layer is subjected to ultrasonic water washing treatment, the aluminum alloy blank is placed into dimethyl sulfoxide solution with a sulfonate under the preset condition to be subjected to electrophoresis treatment, and the aluminum alloy blank with the sulfonate on the surface is obtained; and carrying out ultrasonic washing treatment on the aluminum alloy blank with the sulfonate again, and carrying out constant-temperature drying to obtain the aluminum alloy blank for nano injection molding. Therefore, in the insert injection molding process, the aluminum alloy blank and the special engineering plastic can be better fused, and the bonding force is tighter.
The aluminum alloy blank provided in the embodiment of the invention is obtained by processing the aluminum alloy blank by the processing method. Therefore, the aluminum alloy blank and the special engineering plastic have better compatibility and tighter binding force.
The application of the aluminum alloy blank obtained by the treatment method in the embodiment of the invention in the composite gear can be applied to the fields of insert injection molding of the composite gear and the like, so that the composite gear has tighter bonding force in the injection molding process.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A method of treating an aluminum alloy blank, comprising:
providing a pretreated aluminum alloy blank;
placing the aluminum alloy blank in an acidic corrosive liquid, and carrying out anodic oxidation treatment on the aluminum alloy blank under a preset condition to form the aluminum alloy blank with an oxide layer and nano-scale micropores formed on the surface;
after the aluminum alloy blank with the oxide layer is subjected to ultrasonic water washing treatment, placing the aluminum alloy blank into dimethyl sulfoxide solution with a sulfonated substance under the preset condition for electrophoresis treatment to obtain the aluminum alloy blank with the sulfonated substance on the surface;
carrying out ultrasonic washing treatment on the aluminum alloy blank with the sulfonated substance again, and drying at constant temperature to obtain an aluminum alloy blank for nano injection molding;
the concentration of the dimethyl sulfoxide solution is 1-10wt%, and the sulfonated substance is one or a mixture of more of sulfonated polysulfone (S-PSU), sulfonated polyether sulfone (S-PES), sulfonated polyphenylene sulfone (S-PPSU), sulfonated polyether ether ketone (S-PEEK), sulfonated polyether ketone (S-PEK), sulfonated polyether ketone (S-PEKK) and sulfonated polyether ketone ether ketone (S-PEKEKK).
2. The method of processing an aluminum alloy blank according to claim 1, wherein the pretreatment of the aluminum alloy blank comprises:
carrying out sand blasting polishing on the aluminum alloy blank through a sand material with a preset particle size so as to remove a surface oxide layer of the aluminum alloy blank;
placing the aluminum alloy blank with the surface oxide layer removed into a deionized water solution for deoiling treatment; wherein the deoiling treatment temperature is 50-75 ℃, and the treatment time is 5-10 minutes;
and carrying out ultrasonic water washing treatment on the aluminum alloy blank after the deoiling treatment so as to finish the pretreatment operation of the aluminum alloy blank.
3. The method for treating an aluminum alloy blank according to claim 2, wherein the deionized water solution comprises 3-5 wt.% sodium carbonate, 3-5 wt.% trisodium phosphate, and 1-3 wt.% sodium silicate.
4. The method for treating an aluminum alloy blank according to claim 1 or 2, wherein the number of times of the ultrasonic water washing is 3 to 4 times, and the washing time is 2 to 3 minutes, and the frequency of the ultrasonic wave is 100kHz.
5. The method for treating the aluminum alloy blank according to claim 1, wherein the acidic corrosive liquid comprises hydrochloric acid, sulfuric acid and oxalic acid, wherein the ratio of the hydrochloric acid to the sulfuric acid to the oxalic acid is 3-3.5:2-2.5:0.5-1, and the acid content percentage in the acidic corrosive liquid is 2-10wt%.
6. The method of treating an aluminum alloy blank according to claim 1, wherein the predetermined conditions are a temperature of 30 ± 5 ℃, a current density of 500 ± 50mA/cm2, and ultrasonic treatment with an ultrasonic wave of 50 ± 25kHz, and a treatment time of 3 to 10 minutes.
7. Method for treating an aluminium alloy blank according to claim 1, wherein the thickness of the oxide layer is 10-50um.
8. An aluminum alloy blank characterized by being treated by the treatment method as recited in any one of claims 1 to 7.
9. Use of an aluminium alloy blank treated by the treatment method of any one of claims 1 to 7 in a composite gear.
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