CN113718312A - Treatment liquid for removing residual acid after anodic oxidation of aluminum alloy and use method thereof - Google Patents
Treatment liquid for removing residual acid after anodic oxidation of aluminum alloy and use method thereof Download PDFInfo
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- CN113718312A CN113718312A CN202010443236.8A CN202010443236A CN113718312A CN 113718312 A CN113718312 A CN 113718312A CN 202010443236 A CN202010443236 A CN 202010443236A CN 113718312 A CN113718312 A CN 113718312A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The present disclosure provides a treatment liquid for removing residual acid after anodic oxidation of aluminum alloy, which contains nicotinic acid, nitric acid, sodium acetate, sulfamic acid and water. The treatment liquid for removing the residual acid after the anodic oxidation of the aluminum alloy can stably and efficiently remove the residual acid, effectively save the cost and improve the efficiency and the yield.
Description
Technical Field
The application relates to the field of material surface treatment, in particular to a treatment fluid for removing residual acid after anodic oxidation of aluminum alloy and a using method thereof.
Background
The frame body of the mobile communication equipment represented by the mobile phone is an application field with high thin-wall requirements, has the characteristics of high strength, good heat conductivity, stable size and good appearance, and can achieve the effects of protecting, radiating and beautifying the mobile communication equipment. The aluminum alloy has excellent performances of high specific strength, good heat conductivity, high corrosion resistance and the like, and bright and colorful appearance effects can be obtained by matching pretreatment such as sand blasting, wire drawing, polishing and the like with anodic oxidation treatment. Therefore, at present, the frame body is often manufactured by aluminum alloy anodic oxidation and nano-molding technology.
The technical process scheme of the common aluminum alloy mobile phone shell is as follows: CNC → T processing → nano injection → secondary CNC → grinding → sand blasting → primary anodizing → high light CNC → secondary anodizing → blanking → laser etching → assembling.
Because the aluminum alloy shell structure can have blind holes and gaps, gaps inevitably exist between the aluminum alloy and the plastic in the nanometer injection molding process. Chemical substances such as sulfuric acid, phosphoric acid, nitric acid and the like in the process flow of anodic oxidation enter the area, and the acid flows out to corrode an anodic oxide film layer in the dyeing process, so that the dyeing is poor, and the appearance is affected.
The existing scheme is to wash the residual acid in the gap by increasing the washing times and time, or to soak the neutralized residual acid with a solution containing sodium carbonate or sodium bicarbonate and to ream the holes by using dilute ammonia water or weak alkaline salt, but the sodium carbonate or sodium bicarbonate is easy to decompose and has poor stability under an acidic condition and when being heated, so that the use effect is very limited, and the ammonia water and the weak alkaline salt are independently used for reaming the holes, so that the treatment process is increased, the cost is increased, and the stability is poor.
Therefore, a residual acid removing method which can stably and efficiently remove residual acid and can also play a role in hole expansion is needed, so that the cost of residual acid removal is reduced, and the residual acid removing efficiency is improved.
Disclosure of Invention
The purpose of the present disclosure is to provide a residual acid removing method which can stably and efficiently remove residual acid and can also play a role in hole expansion.
In order to achieve the above object, one aspect of the present disclosure provides a treatment liquid for removing residual acid after anodic oxidation of aluminum alloy, the treatment liquid containing nicotinic acid, nitric acid, sodium acetate, sulfamic acid and water.
Optionally, the concentration of the nicotinic acid is 0.05-0.2 mol/L; the concentration of the nitric acid is 0.05-0.2 mol/L; the concentration of the sodium acetate is 5-20 g/L; the concentration of the sulfamic acid is 8-40 g/L.
Optionally, the concentration of the nicotinic acid in the treatment liquid is 0.1-0.2 mol/L; the concentration of the nitric acid is 0.1-0.2 mol/L; the concentration of the sodium acetate is 10-15 g/L; the concentration of the sulfamic acid is 20-40 g/L.
Optionally, the concentration ratio of the nicotinic acid to the nitric acid is 1: 0.75-1.5.
Optionally, the treatment fluid further comprises a cleaning assistant; the cleaning auxiliary agent is at least one of glycerol, glycol and glycol ether, and preferably glycerol; the concentration of the cleaning auxiliary agent is 1-5mL/L, preferably 2-3 mL/L.
In another aspect, the present disclosure provides a method for removing residual acid after anodic oxidation of an aluminum alloy, including: and (3) carrying out residual acid removal treatment on the aluminum alloy injection molding after the anodic oxidation treatment by using the treatment liquid.
Optionally, the conditions of the acid residue removal treatment include: the treatment temperature is 15-50 ℃, preferably 20-50 ℃; the treatment time is 2-15min, preferably 2-10 min.
Optionally, the method further comprises: and respectively washing the aluminum alloy injection molding before and after residual acid removal treatment.
Optionally, the conditions of the water washing include: the pH value of the water is 6-7, and the conductivity is below 1 mu s/cm; the washing time of the water washing is 5 to 60s, preferably 30 to 60 s.
Optionally, the acid residue removal treatment is performed at least twice, and water washing is also performed between two adjacent acid residue removal treatments.
Optionally, the residual acid removal treatment is performed under ultrasonic oscillation; the conditions of the ultrasonic oscillation include: the specific power is 5-70W/L, preferably 20-40W/L; the frequency is 20-100kHZ, preferably 25-45 kHZ.
Through the technical scheme, the treatment liquid for removing the residual acid after anodic oxidation of the aluminum alloy injection molding can be used for stably and efficiently removing the residual acid, effectively saving the cost and improving the efficiency and yield.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present disclosure. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
The treatment liquid comprises nicotinic acid, nitric acid, sodium acetate, sulfamic acid and water.
The nitric acid in the method can clean colloid deposited on the surface of an oxidation film, and can play a main role in cleaning gaps between aluminum alloy and plastic; the nicotinic acid can control the reaction speed, so that the reaction process is stable and easy to control. The combined action of the nitric acid and the nicotinic acid can enlarge the pores of the oxide film in the subsequent dyeing process, so that the surface of the aluminum alloy injection molding piece is cleaner, the dye can enter the pores, and the dyeing time and the dyeing depth are shortened. Sodium acetate can react with residual acid fast after entering the clearance to avoid the residual acid to separate out the corruption or the destruction that causes the clearance both sides, and have certain additional contribution to the reaming. The sulfamic acid has high solubility in water, is easy to enter gaps between the aluminum alloy and the plastic, can slowly react with an oxide film generated by anodic oxidation of the aluminum alloy injection molding to generate a soluble compound and plays a certain role in protection, so that the aluminum alloy is not damaged by residual acid.
In the disclosure, in order to further effectively remove residual acid liquor on the surface and in the gaps of the aluminum alloy injection molding part, the concentration of the nicotinic acid is preferably 0.05-0.2 mol/L; the concentration of the nitric acid is 0.05-0.2 mol/L; the concentration of the sodium acetate is 5-20 g/L; the concentration of the sulfamic acid is 8-40 g/L. Further preferably, the concentration of the nicotinic acid in the treatment liquid is 0.1-0.2 mol/L; the concentration of the nitric acid is 0.1-0.2 mol/L; the concentration of the sodium acetate is 10-15 g/L; the concentration of the sulfamic acid is 20-40 g/L.
The inventor of the present disclosure finds out through a large number of experiments that when the concentration ratio of the nicotinic acid to the nitric acid is 1: 0.75-1.5, the residual acid removing treatment solution disclosed by the invention can effectively remove residual acid liquor on the surface and in gaps of the aluminum alloy injection molding piece, can ensure that the whole residual acid removing process is stable and easy to control, and the cleaned injection molding piece can be directly dyed without reaming.
According to the present disclosure, the treatment fluid further contains a cleaning aid; the cleaning auxiliary agent is at least one of glycerol, glycol and glycol ether, and preferably glycerol; the concentration of the cleaning auxiliary agent is 1-5mL/L, preferably 2-3 mL/L. The cleaning auxiliary agent disclosed by the invention has better dispersibility, so that the dissolution and the removal of residual acid or residual acid reactants can be accelerated.
In accordance with the present disclosure, the niacin and nitric acid may be added as a mixed liquor. The preparation process of the treatment solution for removing residual acid can be that the volumes of the mixed solution of nicotinic acid and nitric acid, sodium acetate, sulfamic acid and cleaning auxiliary agent to be added are calculated and measured according to the volume of the pre-prepared treatment solution, 1/3-1/2 of pure water is firstly added into a tank body, and then the measured mixed solution of nicotinic acid and nitric acid, sodium acetate, sulfamic acid and cleaning auxiliary agent are respectively and sequentially added into the tank and are uniformly stirred until the mixture is completely dissolved or dispersed.
In another aspect, the present disclosure provides a method of removing residual acid after anodic oxidation, the method comprising: and (3) carrying out residual acid removal treatment on the aluminum alloy injection molding after the anodic oxidation treatment by using the treatment liquid.
By using the residual acid removing treatment solution, on one hand, the residual acid solution of the aluminum alloy injection molding piece after anodic oxidation treatment can be effectively removed, the residual acid removing process is stable and easy to control, and the corrosion of the residual acid separated out on the surface of the aluminum alloy injection molding piece is avoided; on the other hand, the pores of the anodic oxide film layer can be enlarged, which is beneficial for the dye to enter the film pores in the subsequent dyeing process, thereby shortening the dyeing time and the dyeing depth.
According to the present disclosure, the conditions of the acid residue removal treatment include: the treatment temperature is 15-50 ℃, preferably 20-50 ℃; the treatment time is 2-15min, preferably 2-10 min.
According to the present disclosure, the method further comprises: and respectively washing the aluminum alloy injection molding before and after residual acid removal treatment. Wherein the washing conditions comprise: the pH value of the water is 6-7, and the conductivity is below 1 mu s/cm; the washing time of the water washing is 5 to 60s, preferably 30 to 60 s.
According to the present disclosure, the acid residue removal treatment is performed at least twice, and water washing is also performed between two adjacent acid residue removal treatments. The residual acid removal treatment in the present disclosure is preferably performed twice, and by performing the residual acid removal treatment twice, most of acid liquor residues can be effectively removed, which also helps to reduce the cost of residual acid removal.
According to the present disclosure, the acid residue removal treatment is performed under ultrasonic oscillation. Because of the penetrability and cavitation shock wave generated when the ultrasonic wave is transmitted in the medium, the residual acid removing treatment liquid can enter the gap between the plastic and the aluminum alloy injection molding part, and the residual acid liquid in the gap can be removed more thoroughly. Wherein the conditions of the ultrasonic oscillation include: the specific power is 5-70W/L, preferably 10-40W/L; the frequency is 20-100kHZ, preferably 25-45 kHZ.
The present disclosure is further illustrated by the following examples, but is not to be construed as being limited thereby.
The materials, reagents, instruments and equipment used in the examples of the present disclosure are commercially available, unless otherwise specified.
Example 1
The treatment liquid in this embodiment includes: nicotinic acid, nitric acid, sodium acetate, sulfamic acid, water and glycerol. Wherein the concentration ratio of the nicotinic acid to the nitric acid is 1: 1, the concentration of nicotinic acid is 0.15mol/L, the concentration of nitric acid is 0.15mol/L, the concentration of sulfamic acid is 30g/L, the concentration of sodium acetate is 12g/L, and the concentration of glycerol is 3 mL/L.
The method for removing residual acid in this embodiment includes two residual acid removal treatments. Wherein, the conditions of the residual acid removal treatment are as follows: the temperature is 25-35 deg.C, and the time is 3 min; the specific power of ultrasonic oscillation was 20W/L, and the frequency was 30 kHZ. Washing conditions: the pH value of the water is 6.5, and the conductivity is 0.8 mu s/cm; and cleaning for 60s at room temperature.
Example 2
The method for removing residual acid in this embodiment is the same as embodiment 1, except that the treatment solution in this embodiment includes: nicotinic acid, nitric acid, sodium acetate, sulfamic acid, water and glycerol. The concentration ratio of the nicotinic acid to the nitric acid is 1: 2, the concentration of nicotinic acid is 0.1mol/L, the concentration of nitric acid is 0.2mol/L, the concentration of sulfamic acid is 30g/L, the concentration of sodium acetate is 12g/L, and the concentration of glycerol is 3 mL/L.
Example 3
The method for removing residual acid in this embodiment is the same as embodiment 1, except that the treatment solution in this embodiment includes: nicotinic acid, nitric acid, sodium acetate, sulfamic acid, water and ethylene glycol. The concentration ratio of the nicotinic acid to the nitric acid is 1: 0.6, the concentration of the nicotinic acid is 0.15mol/L, the concentration of the nitric acid is 0.09mol/L, the concentration of the sulfamic acid is 30g/L, the concentration of the sodium acetate is 12g/L, and the concentration of the ethylene glycol is 3 mL/L.
Example 4
The method for removing residual acid in this embodiment is the same as embodiment 1, except that the treatment solution in this embodiment includes: nicotinic acid, nitric acid, sodium acetate, sulfamic acid, water and glycerol. The concentration ratio of the nicotinic acid to the nitric acid is 1: 1.5, the concentration of the nicotinic acid is 0.12mol/L, the concentration of the nitric acid is 0.18mol/L, the concentration of the sulfamic acid is 20g/L, the concentration of the sodium acetate is 10g/L, and the concentration of the glycerol is 2 mL/L.
Example 5
The method for removing residual acid in this embodiment is the same as embodiment 1, except that the treatment solution in this embodiment includes: nicotinic acid, nitric acid, sodium acetate, sulfamic acid, water and glycol ether. The concentration of nicotinic acid is 0.08mol/L, the concentration of nitric acid is 0.05mol/L, the concentration of sulfamic acid is 10g/L, the concentration of sodium acetate is 8g/L, and the concentration of glycol ether is 1 mL/L.
Example 6
The method for removing residual acid in this embodiment is the same as embodiment 1, except that the treatment solution in this embodiment includes: the feed comprises nicotinic acid, nitric acid, sodium acetate, sulfamic acid and water, wherein the concentration of the nicotinic acid is 0.3mol/L, the concentration of the nitric acid is 0.05mol/L, the concentration of the sulfamic acid is 25g/L, and the concentration of the sodium acetate is 30 g/L.
Example 7
The method for removing residual acid in this embodiment is the same as embodiment 1, except that the treatment solution in this embodiment includes: the feed comprises nicotinic acid, nitric acid, sodium acetate, sulfamic acid and water, wherein the concentration of the nicotinic acid is 0.02mol/L, the concentration of the nitric acid is 0.25mol/L, the concentration of the sulfamic acid is 50g/L, and the concentration of the sodium acetate is 3 g/L.
Example 8
The treating solution and the method for removing residual acid in this example were the same as in example 1, except that the conditions for the residual acid removal treatment were as follows: the temperature is 25 deg.C, and the time is 1 min; the specific power of ultrasonic oscillation was 5W/L, and the frequency was 50 kHZ. Washing conditions: the pH value of the water is 6.5, and the conductivity is 0.8 mu s/cm; and cleaning for 10s at room temperature.
Example 9
The treatment solution and the method for removing residual acid in this example are the same as those in example 1, except that the residual acid removal treatment is performed only once in this example.
Example 10
The treatment solution and the method for removing residual acid in this example were the same as in example 1, except that the ultrasonic oscillation was not performed in the residual acid removing treatment.
Comparative example 1
The comparative example uses a pure water washing method to remove the residual acid after anodic oxidation, wherein the washing conditions are as follows: washing with water at room temperature for 4 times, wherein each time of washing with water is 60 s.
Comparative example 2
In the comparative example, residual acid after anodic oxidation is removed by using an ammonia water soaking method, wherein the ammonia water concentration is 3mL/L, the soaking time is 4min, and the soaking times are 2 times.
Comparative example 3
In the comparative example, after the solution containing sodium bicarbonate is used for soaking and neutralizing residual acid, diluted ammonia water is used for reaming, wherein the concentration of the sodium bicarbonate is 20g/L, and the soaking time is 120 s; the concentration of the dilute ammonia water is 5mL/L, and the reaming time is 120 s.
Comparative example 4
In the comparative example, sulfamic acid, sodium bicarbonate and isopropanol are prepared into cleaning solution with the concentration of 50g/L according to the mass ratio of 25:10:1, and the cleaning solution is used for soaking at 50 ℃ to neutralize residual acid and then is used for reaming by using dilute ammonia water. Wherein ultrasonic oscillation is used in the process of soaking the cleaning solution, the specific power of the ultrasonic oscillation is 20W/L, the frequency is 30kHZ, and the soaking time is 4 min; the concentration of the dilute ammonia water is 2.5g/L, and the reaming time is 3 min.
Comparative example 5
This comparative example was prepared by mixing sodium dodecylbenzenesulfonate, aluminum chloride, acetamide, ethanol, 3-oxocyclobutanecarboxylic acid, diethylenetriaminepentamethylenephosphonic acid, 6-trifluoromethylnicotinic acid, nitric acid, chromium acetate, agar, and sulfamic acid in a ratio of 4: 11: 1.2: 20: 6: 9: 0.8: 1.5: 3.2: 0.3: 43 mass percent of the cleaning solution with the concentration of 5 percent is prepared, the cleaning solution is soaked at 60 ℃ for neutralizing residual acid and then is washed with water, wherein the soaking time is 3min, and the washing condition is the same as that of the embodiment 1.
Comparative example 6
The method for removing residual acid in this comparative example was the same as in example 1, except that the treating liquid in this comparative example included: nicotinic acid, sodium acetate, sulfamic acid, water and glycerol, wherein the concentration of the nicotinic acid is 0.15mol/L, the concentration of the sulfamic acid is 30g/L, the concentration of the sodium acetate is 12g/L, and the concentration of the glycerol is 3 mL/L.
Comparative example 7
The method for removing residual acid in this comparative example was the same as in example 1, except that the treating liquid in this comparative example included: the feed comprises nicotinic acid, nitric acid, sodium acetate, sulfamic acid, water and glycerol, wherein the concentration of the nicotinic acid is 0.15mol/L, the concentration of the nitric acid is 0.15mol/L, the concentration of the sulfamic acid is 30g/L, and the concentration of the glycerol is 3 mL/L.
Test example 1
After the aluminum alloy shells obtained in examples 1 to 10 and comparative examples 1 to 7 after removing residual acid were subjected to normal dyeing (dark black), sealing and drying procedures, GB/T12967.6-2008 "method for detecting anodic oxide films of aluminum and aluminum alloys part 6: and (4) inspecting the film quality of the joint of the aluminum alloy and the plastic in the aluminum alloy shell by a visual inspection method. If residual acid is precipitated due to dark black dyeing, the aluminum alloy oxide film in the area has obvious white dotted or strip-shaped dyeing defects, and the occurrence of the dyeing defects is counted, and specific results are shown in table 1.
TABLE 1
As can be seen from table 1, the film layer treated with the treatment solution of the present disclosure had no visible adverse phenomena. Therefore, the treatment liquid for removing the residual acid after the anodic oxidation of the aluminum alloy shell can stably and efficiently remove the residual acid.
The preferred embodiments of the present disclosure have been described in detail above, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A treatment liquid for removing residual acid after anodic oxidation of aluminum alloy is characterized by comprising nicotinic acid, nitric acid, sodium acetate, sulfamic acid and water.
2. The treatment solution according to claim 1, wherein the concentration of the nicotinic acid is 0.05 to 0.2 mol/L; the concentration of the nitric acid is 0.05-0.2 mol/L; the concentration of the sodium acetate is 5-20 g/L; the concentration of the sulfamic acid is 8-40 g/L;
preferably, the concentration of the nicotinic acid is 0.1-0.2 mol/L; the concentration of the nitric acid is 0.1-0.2 mol/L; the concentration of the sodium acetate is 10-15 g/L; the concentration of the sulfamic acid is 20-40 g/L.
3. The treatment liquid according to claim 1, wherein a concentration ratio of the nicotinic acid to the nitric acid is 1: 0.75-1.5.
4. The treatment liquid according to claim 1, further comprising a cleaning assistant; the cleaning auxiliary agent is at least one of glycerol, glycol and glycol ether, and preferably glycerol; the concentration of the cleaning auxiliary agent is 1-5mL/L, preferably 2-3 mL/L.
5. A method for removing residual acid after anodic oxidation of aluminum alloy is characterized by comprising the following steps: the treatment liquid of any one of claims 1 to 4 is used for removing residual acid from the anodized aluminum alloy injection molded part.
6. The method of claim 5, wherein the conditions of the acid residue removal treatment comprise: the treatment temperature is 15-50 ℃, preferably 40-50 ℃; the treatment time is 2-15min, preferably 2-10 min.
7. The method of claim 5, wherein the method further comprises: and respectively washing the aluminum alloy injection molding before and after residual acid removal treatment.
8. The method of claim 7, wherein the conditions of the water wash comprise: the pH value of the water is 6-7, and the conductivity is below 1 mu s/cm; the washing time of the water washing is 5 to 60s, preferably 30 to 60 s.
9. The method according to claim 7 or 8, wherein the acid stripping treatment is performed at least twice, and water washing is also performed between two adjacent acid stripping treatments.
10. The method according to claim 6, wherein the acid residue removal treatment is performed under ultrasonic oscillation; the conditions of the ultrasonic oscillation include: the specific power is 5-70W/L, preferably 30-40W/L; the frequency is 20-100kHZ, preferably 25-45 kHZ.
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