CN114369828A - Aluminum alloy acid etching liquid and preparation method thereof - Google Patents
Aluminum alloy acid etching liquid and preparation method thereof Download PDFInfo
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
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- C23F1/20—Acidic compositions for etching aluminium or alloys thereof
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Abstract
The invention relates to the field of acid etching liquid, and particularly discloses an aluminum alloy acid etching liquid and a preparation method thereof. The aluminum alloy acid etching solution comprises the following components in parts by mass: 48-50 parts of nitric acid; 24-25 parts of sulfuric acid; 5-6 parts of ammonium bifluoride; 0-1 part of degreasing agent; 18-23 parts of water; the total mass portion is 100 portions. The preparation method comprises the following steps: step 1), injecting water into a container, adding sulfuric acid into the water, stirring and cooling to room temperature to obtain a sulfuric acid solution; step 2), adding nitric acid into the sulfuric acid solution, stirring and cooling to room temperature to obtain a mixed solution; and 3) adding ammonium bifluoride and a degreasing agent into the mixed solution, and uniformly stirring to obtain the aluminum alloy acid etching solution. The invention has the effects of improving the acid etching efficiency and keeping the aluminum material with better quality.
Description
Technical Field
The invention relates to the field of acid etching liquid, in particular to aluminum alloy acid etching liquid and a preparation method thereof.
Background
The aluminum alloy is an alloy prepared by adding a certain amount of other alloying elements to aluminum serving as a base material, and is one of light metal materials.
In order to improve the corrosion resistance and weather resistance of the aluminum alloy material, the surface of the aluminum alloy material is generally required to be sprayed for protection, the surface of the aluminum alloy is required to be kept clean before spraying, and grease and impurities on the surface are required to be removed, so that the coating is tightly attached to the aluminum alloy and the peeling phenomenon is not easy to occur.
The existing aluminum alloy surface degreasing treatment mainly comprises alkaline etching and acid etching, wherein the alkaline etching is slow in reaction and easy to generate coarse crystal phenomenon, so that the acid etching process gradually occupies the mainstream.
The aluminum material acid etching needs to adopt acid etching liquid, sulfuric acid is one of main components of the acid etching liquid, the sulfuric acid can dissolve and strip a natural oxidation film formed on the surface of an aluminum alloy and can play a role in activating the surface of the aluminum material, when the concentration of the sulfuric acid is too high, the corrosion speed of the aluminum is high, over corrosion is easy to generate, and the brightness is reduced, so that the concentration of the sulfuric acid in the general acid etching liquid is not more than 15%.
However, the concentration of sulfuric acid is related to the reaction speed, so that the time required for acid etching is long due to the low concentration of sulfuric acid in order to avoid over corrosion caused by too high speed, usually 1-5min is required, although the efficiency is higher than that of alkaline etching, the efficiency is still low, if the efficiency is improved by simply increasing the concentration of sulfuric acid, the over corrosion phenomenon is easily caused because the acid etching time is difficult to control, the quality of the aluminum material is reduced, and therefore, the improvement space is provided.
Disclosure of Invention
In order to improve the acid etching efficiency and keep the aluminum material to have better quality, the application provides an aluminum alloy acid etching solution and a preparation method thereof.
In a first aspect, the present application provides an aluminum alloy acid etching solution, which adopts the following technical scheme:
an aluminum alloy acid etching solution comprises the following components in parts by weight:
48-50 parts of nitric acid;
24-25 parts of sulfuric acid;
5-6 parts of ammonium bifluoride;
0-1 part of degreasing agent;
18-23 parts of water;
the total mass portion is 100 portions.
Preferably, the composition comprises the following components in parts by mass:
48.5-49.5 parts of nitric acid;
24.25-24.75 parts of sulfuric acid;
5.25-5.75 parts of ammonium bifluoride;
0-1 part of degreasing agent;
19.25-21.75 parts of water;
the total mass portion is 100 portions.
By adopting the technical scheme, the acid etching speed is greatly improved by the concentration of the sulfuric acid being as high as 24-25%, the acid etching can be completed within 3-30 s basically according to the actual condition of the aluminum material, the acid etching speed is high, the nitric acid with the concentration being as high as 48-50% is added for the proportion over-corrosion phenomenon, the nitric acid is a strong oxidant, the content of the nitric acid is high, when the natural maintenance film on the surface of the aluminum material is corroded by the sulfuric acid, a brand-new and compact aluminum oxide passive film can be generated under the action of the nitric acid, the corrosion prevention effect of the aluminum oxide passive film is excellent, the corrosion speed of the sulfuric acid with the high concentration is restrained, the acid etching efficiency is improved, but once the aluminum material is exposed due to stripping of grease and impurities attached to the surface of the aluminum material due to the acid etching, the strong oxidation effect of the nitric acid can enable the aluminum material surface to rapidly form the aluminum oxide passive film to protect the aluminum material, make the aluminum product be difficult for receiving the rapid corrosion to dwell a period of time in the acid etching agent more, also can not lead to the overetching, the condition that luminance descends can not appear for the aluminum product can also have sufficient operation buffering time when making the aluminum product carry out the acid etching in the acid etching agent fast, keeps the aluminum product quality preferred.
The addition of ammonium bifluoride, can dissolve the natural oxide film on aluminium surface with higher speed, eliminate or reduce defects such as indentation, make the aluminum product surface level and smooth and clean, and still have stronger complex ability, can dissolve elements and impurities such as manganese, copper, silicon on aluminium alloy surface, make aluminium alloy surface be difficult for appearing the black film, make the luminance of aluminum alloy better, fluorine element also can accelerate the formation of aluminium oxide passive film simultaneously, supplementary nitric acid makes the clean aluminium alloy surface form aluminium oxide passive film fast in order to block further corruption of sulphuric acid, make the acid etching efficiency higher and be difficult for appearing the harm of excessive corrosion.
Preferably, the degreasing agent is a compound of ferrous sulfate, dipropylene glycol and a nonionic surfactant.
Through adopting above-mentioned technical scheme, through the addition of ferrous sulfate, under the strong oxidation of nitric acid, produce ferric ion, ferric ion can take place the replacement reaction on the aluminum alloy surface, forms little battery for the aluminum alloy surface produces trace hydrogen, makes the greasy dirt more easily leave the aluminum alloy surface through hydrogen, accelerates the degrease effect.
The solubility of the grease in the acid etching is greatly increased by the matching of the dipropylene glycol and the nonionic surfactant, the grease is not easy to attach to the surface of the aluminum alloy for the next time after falling off, the surface of the aluminum alloy after the acid etching is finished is cleaner, the service life of the acid etching solution is longer, more aluminum alloy materials can be treated, the frequency of replacing the acid etching solution is reduced, and the high-efficiency acid etching solution has high economic value.
Preferably, the mass ratio of the ferrous sulfate to the dipropylene glycol to the nonionic surfactant is 1: 0.2: 0.3.
by adopting the technical scheme, the degreasing effect is better and the speed is higher by selecting the specific proportion for compounding, and the acid etching efficiency is improved.
Preferably, the nonionic surfactant is a compound of alkylphenol ethoxylates and fatty alcohol-polyoxyethylene ether.
By adopting the technical scheme, through adopting the compounding of the alkylphenol ethoxylates and the fatty alcohol-polyoxyethylene ether, the grease has stronger solubility, the grease is accelerated to dissolve and fall off, the grease is not easy to be attached to the aluminum alloy again, and the degreasing effect is better.
Preferably, the mass ratio of the alkylphenol polyoxyethylene ether to the fatty alcohol polyoxyethylene ether is 1: 1.
by adopting the technical scheme, the degreasing effect is better, the acid etching efficiency is higher, the limit of oil dissolution of the acid etching liquid is higher, and the service life is longer by selecting specific proportion for matching.
In a second aspect, the application provides a preparation method of an aluminum alloy acid etching solution, which adopts the following technical scheme:
the preparation method of the aluminum alloy acid etching solution comprises the following steps:
step 1), injecting water into a container, adding sulfuric acid into the water, stirring and cooling to room temperature to obtain a sulfuric acid solution;
step 2), adding nitric acid into the sulfuric acid solution, stirring and cooling to room temperature to obtain a mixed solution;
and 3) adding ammonium bifluoride and a degreasing agent into the mixed solution, and uniformly stirring to obtain the aluminum alloy acid etching solution.
Through adopting above-mentioned technical scheme, through stirring cooling, reduce the temperature of acid etching liquid, because the content of concentrated acid is higher, if add too fast, arouse the boiling easily and lead to the acid spill, cause the incident easily, can make exothermic influence obtain declining by a wide margin through stirring cooling, improve production safety.
Preferably, in the step 1), when sulfuric acid is added into water, the sulfuric acid is injected at a constant speed for 10min, and in the step 2), when nitric acid is added into a sulfuric acid solution, the nitric acid is injected at a constant speed for 15 min.
By adopting the technical scheme, the concentrated accumulation of heat in the heat release process is further reduced by controlling the injection time of the acid, so that the production safety is higher in the acid etching solution blending process.
In summary, the present application has the following beneficial effects:
1. because the concentration of the sulfuric acid is as high as 24-25%, the acid etching speed is greatly improved, according to the actual condition of the aluminum material, the acid etching can be completed within 3-30 s basically, because the acid etching speed is high, nitric acid with the concentration of 48-50% is added for the proportion over-corrosion phenomenon, the nitric acid is a strong oxidant, because the content of the nitric acid is high, after the natural maintenance film on the surface of the aluminum material is corroded by the sulfuric acid, a brand-new and compact aluminum oxide passive film can be generated under the action of the nitric acid, the corrosion resistance effect of the aluminum oxide passive film is excellent, the corrosion speed of the sulfuric acid with high concentration is restrained, the acid etching efficiency is improved, but once the aluminum material is exposed due to stripping of grease and impurities attached to the surface of the aluminum material due to the acid etching, the strong oxidation effect of the nitric acid can enable the surface of the aluminum material to quickly form the aluminum oxide passive film to protect the aluminum material, make the aluminum product be difficult for receiving the rapid corrosion to dwell a period of time in the acid etching agent more, also can not lead to the overetching, the condition that luminance descends can not appear for the aluminum product can also have sufficient operation buffering time when making the aluminum product carry out the acid etching in the acid etching agent fast, keeps the aluminum product quality preferred.
2. Preferably the addition through ammonium bifluoride in this application, can accelerate the natural oxide film who dissolves the aluminium surface, eliminate or reduce defects such as indentation, make the aluminum product surface level and smooth, and still have stronger complex ability, can dissolve elements and impurity such as manganese on aluminum alloy surface, copper, silicon, make the difficult black film that appears in aluminum alloy surface, make the luminance of aluminum alloy better, fluorine element also can accelerate the formation of alumina passive film simultaneously, supplementary nitric acid makes the quick alumina passive film that forms on clean aluminum alloy surface in order to block the further corruption of sulphuric acid, make the higher harm that just is difficult for appearing the excessive corrosion of acid etching efficiency.
3. Through the preferable cooperation of the dipropylene glycol and the nonionic surfactant, the solubility of the grease in the acid etching is greatly increased, the grease is not easy to attach to the surface of the aluminum alloy in the next time after falling off, the surface of the aluminum alloy after the acid etching is finished is cleaner, the service life of the acid etching solution is longer, more aluminum alloy materials can be treated, the frequency of replacing the acid etching solution is reduced, and the higher economic value is achieved.
4. The method reduces the temperature of the acid etching liquid through stirring and cooling, and because the content of concentrated acid is high, if the concentrated acid is added too fast, the boiling is easily caused to cause acid splashing, so that safety accidents are easily caused, the influence of heat release can be greatly reduced through stirring and cooling, and the production safety is improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The information on the source of the raw materials used in the following examples and comparative examples is detailed in Table 1.
TABLE 1
| Source information | |
| Nitric acid | Jinan Yingdong chemical Limited company, concentrated nitric acid, 98% concentration |
| Sulfuric acid | The limited chemical formula of the great chemical industry in the Ministry of China, concentrated sulfuric acid, the concentration is 98 percent |
| Ammonium hydrogen fluoride | Wuhan Lioring science and technology Limited, CAS: 1341-49-7 |
| Ferrous sulfate | Shandong Qing Yixin chemical technology Co., Ltd, CAS: 7782-63-0 |
| Dipropylene glycol | Att (Shandong) New materials Co., Ltd., CAS110-98-5 |
| Alkylphenol ethoxylates | "Jinan hong cheng chemical Co., Ltd", emulsifier OP-10 |
| Fatty alcohol polyoxyethylene ether | Emulsifier AEO-9 from Jinan Maifeng chemical Co., Ltd |
Examples 1 to 5
An aluminum alloy acid etching solution comprises the following components:
nitric acid, sulfuric acid, ammonium bifluoride, a degreasing agent and water.
The degreasing agent is a compound of ferrous sulfate, dipropylene glycol and a nonionic surfactant, and the mass ratio of the ferrous sulfate, the dipropylene glycol and the nonionic surfactant is 1: 0.2: 0.3.
the nonionic surfactant is a compound of alkylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether, and the mass ratio of the alkylphenol polyoxyethylene ether to the fatty alcohol polyoxyethylene ether is 1: 1.
the specific amounts (in kg) of the ingredients used in examples 1-5 are detailed in Table 2.
TABLE 2
The preparation method of the aluminum alloy acid etching solution comprises the following steps:
step 1), injecting water into a stirring kettle, adding sulfuric acid into the water, injecting the sulfuric acid at a constant speed for 10min, starting stirring while injecting the sulfuric acid, rotating at a speed of 10r/min, and continuously stirring and cooling to room temperature to obtain a sulfuric acid solution;
step 2), adding nitric acid into a sulfuric acid solution, injecting the nitric acid at a constant speed for 15min at a rotation speed of 10r/min, and continuously stirring and cooling to room temperature to obtain a mixed solution;
and 3) adding ammonium bifluoride and a degreasing agent into the mixed solution, stirring at the rotating speed of 10r/min for 10min, and uniformly stirring to obtain the aluminum alloy acid etching solution.
Comparative example 1
An aluminum alloy acid etching solution is different from the aluminum alloy acid etching solution in example 3 only in that:
the mass ratio of the ferrous sulfate to the dipropylene glycol to the nonionic surfactant is 1: 1: 1
Comparative example 2
An aluminum alloy acid etching solution is different from the aluminum alloy acid etching solution in example 3 only in that:
the mass ratio of the alkylphenol polyoxyethylene ether to the fatty alcohol polyoxyethylene ether is 1: 2.
comparative example 3
An aluminum alloy acid etching solution comprises the following components:
49kg of nitric acid, 15kg of sulfuric acid, 5.5kg of ammonium bifluoride, 0.5kg of degreasing agent and 30kg of water.
The degreasing agent is a compound of ferrous sulfate, dipropylene glycol and a nonionic surfactant, and the mass ratio of the ferrous sulfate, the dipropylene glycol and the nonionic surfactant is 1: 0.2: 0.3.
the nonionic surfactant is a compound of alkylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether, and the mass ratio of the alkylphenol polyoxyethylene ether to the fatty alcohol polyoxyethylene ether is 1: 1.
the preparation method of the aluminum alloy acid etching solution comprises the following steps:
step 1), injecting water into a stirring kettle, adding sulfuric acid into the water, injecting the sulfuric acid at a constant speed for 10min, starting stirring while injecting the sulfuric acid, rotating at a speed of 10r/min, and continuously stirring and cooling to room temperature to obtain a sulfuric acid solution;
step 2), adding nitric acid into a sulfuric acid solution, injecting the nitric acid at a constant speed for 15min at a rotation speed of 10r/min, and continuously stirring and cooling to room temperature to obtain a mixed solution;
and 3) adding ammonium bifluoride and a degreasing agent into the mixed solution, stirring at the rotating speed of 10r/min for 10min, and uniformly stirring to obtain the aluminum alloy acid etching solution.
Comparative example 4
An aluminum alloy acid etching solution comprises the following components:
15kg of nitric acid, 24.5kg of sulfuric acid, 5.5kg of ammonium bifluoride, 0.5kg of degreasing agent and 54.5kg of water.
The degreasing agent is a compound of ferrous sulfate, dipropylene glycol and a nonionic surfactant, and the mass ratio of the ferrous sulfate, the dipropylene glycol and the nonionic surfactant is 1: 0.2: 0.3.
the nonionic surfactant is a compound of alkylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether, and the mass ratio of the alkylphenol polyoxyethylene ether to the fatty alcohol polyoxyethylene ether is 1: 1.
the preparation method of the aluminum alloy acid etching solution comprises the following steps:
step 1), injecting water into a stirring kettle, adding sulfuric acid into the water, injecting the sulfuric acid at a constant speed for 10min, starting stirring while injecting the sulfuric acid, rotating at a speed of 10r/min, and continuously stirring and cooling to room temperature to obtain a sulfuric acid solution;
step 2), adding nitric acid into a sulfuric acid solution, injecting the nitric acid at a constant speed for 15min at a rotation speed of 10r/min, and continuously stirring and cooling to room temperature to obtain a mixed solution;
and 3) adding ammonium bifluoride and a degreasing agent into the mixed solution, stirring at the rotating speed of 10r/min for 10min, and uniformly stirring to obtain the aluminum alloy acid etching solution.
Experiment 1
The acid etching time of the aluminum alloy of each embodiment and each comparative example is detected and recorded, and the specific experimental method is as follows:
an aluminum alloy sheet sample having a length of 0.1m, a width of 0.1m and a thickness of 0.01m was prepared from aluminum alloy 2A 11.
And naturally placing the aluminum alloy plate sample in an exposed environment for 30 d.
And (3) soaking the aluminum alloy plate after being placed in the aluminum alloy acid etching solution of each embodiment and comparative example, and observing the soaking time required when the surface of the aluminum alloy plate is completely clean, namely the aluminum alloy acid etching time.
The method for observing the required soaking time when the surface of the aluminum alloy plate is completely clean comprises the following steps:
six aluminum alloy plate samples are taken and soaked for 1s, 5s, 15s, 30s, 1min and 5min respectively.
Observing the surface state of each aluminum alloy plate sample after washing, for example, grease and impurities exist on the surface of a 15s plate, the acid etching time is locked within 15s-30s when the surface of a 30s plate is smooth, then soaking an aluminum alloy plate sample in an aluminum alloy acid etching solution for 22s, and after washing, observing, if the surface of the aluminum alloy plate sample is smooth, the acid etching time of the aluminum alloy plate sample is proved to be 15s-22s, otherwise, the acid etching time is 22s-30s, and obtaining the acid etching time of the aluminum alloy by repeating a plurality of experiments, wherein the unit is accurate to the second.
Experiment 2
The time from the acid etching to the occurrence of the over-etching of the aluminum alloy of each example and each comparative example is detected and recorded, and the specific experimental method is as follows:
an aluminum alloy sheet sample having a length of 0.1m, a width of 0.1m and a thickness of 0.01m was prepared from aluminum alloy 2A 11.
And naturally placing the aluminum alloy plate sample in an exposed environment for 30 d.
And (3) soaking the aluminum alloy plate after being placed in the aluminum alloy acid etching solution of each embodiment and comparative example, and observing the soaking time required when the brightness of the surface of the aluminum alloy plate completely begins to decrease, namely the aluminum alloy acid etching time.
The method for observing the required soaking time when the surface of the aluminum alloy plate is completely clean comprises the following steps:
six aluminum alloy plate samples are respectively soaked, and soaking time is 1s, 5s, 15s, 30s, 1min and 5min additionally added on the basis of the acid etching time obtained in experiment 1.
Observing the surface state of each aluminum alloy plate sample after washing, for example, additionally adding 30s for the surface smoothness of the plate, additionally adding 1min for the plate to compare with the 30s plate, if the brightness is reduced, locking the over-corrosion time to be additionally increased by 30s-1min, then soaking an aluminum alloy plate sample in an aluminum alloy acid etching solution, wherein the soaking time is additionally increased by 45s on the basis of the acid etching time obtained in the experiment 1, immediately soaking the aluminum alloy plate sample in clear water after taking out, taking out the aluminum alloy plate sample for 5s, wiping the aluminum alloy plate sample, observing, if the surface of the aluminum alloy plate sample is smooth, proving that the over-corrosion time of the aluminum alloy plate sample is additionally increased by 45s-1min, otherwise, additionally increasing 30s-45s, and repeating the experiments for multiple times to obtain the over-corrosion time of the aluminum alloy, wherein the unit is accurate to seconds.
The specific assay data for experiments 1 and 2 are detailed in table 3.
TABLE 3
According to the data comparison between the example 3 and the comparative example 1 in the table 3, the acid etching time is prolonged when the ferrous sulfate, the dipropylene glycol and the nonionic surfactant are not compounded in a specific ratio, and meanwhile, according to the data comparison between the examples 1, 2, 4 and 5 and the comparative example 1, the influence of the sulfuric acid concentration on the acid etching time is more obvious, and the degreasing agent is only selected to play an auxiliary effect.
According to the data comparison between the example 3 and the comparative example 2 in the table 3, the acid etching time is prolonged when the alkylphenol ethoxylate and the fatty alcohol ethoxylate are not mixed in a specific ratio, and according to the data comparison between the examples 1, 2, 4 and 5 and the comparative example 2, the influence of the sulfuric acid concentration on the acid etching time is more obvious, and the specific selection of the nonionic surfactant only has an auxiliary effect.
According to the comparison of the data of the example 3 and the comparative example 3 in table 3, the sulfuric acid concentration has a large influence on the acid etching time, the sulfuric acid concentration is reduced, the acid etching time is obviously prolonged, the efficiency is reduced, the over-etching time is also obviously prolonged, the sulfuric acid concentration is reduced, the longer buffer time can be provided, and the over-etching phenomenon is effectively reduced, but the buffer time of the example 3 is nearly 70s, although the buffer time is shorter than that of the low-concentration sulfuric acid, the time of about 50s is enough to finish the operations of unloading, flushing and the like, the acid etching efficiency is high, and the over-etching phenomenon is not easy to occur.
According to the comparison of the data of the embodiment 3 and the comparative example 4 in the table 3, the concentration of nitric acid is reduced, so that the oxidizability is reduced, the speed of generating an aluminum oxide passivation film is reduced, the aluminum alloy material cannot be protected in time, the buffer time from the completion of acid etching to the occurrence of over-etching is short and only about 12s is provided, although the aluminum alloy material can be taken out and soaked in clean water immediately in the experiment 2 to remove an acid etching agent, in the actual production, the aluminum alloy material is a large building material, the unloading and cleaning cannot be completed quickly, the hoisting operation is required in the unloading process, and the required time is relatively long, so that the unloading, flushing and other operations are not completed easily in about 12s, the over-etching phenomenon is easy to occur, the processing quality is unstable, the material waste is increased, and the economic benefit is low.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. An aluminum alloy acid etching solution is characterized in that: the paint comprises the following components in parts by mass:
48-50 parts of nitric acid;
24-25 parts of sulfuric acid;
5-6 parts of ammonium bifluoride;
0-1 part of degreasing agent;
18-23 parts of water;
the total mass portion is 100 portions.
2. The aluminum alloy acid etching solution of claim 1, wherein: the paint comprises the following components in parts by mass:
48.5-49.5 parts of nitric acid;
24.25-24.75 parts of sulfuric acid;
5.25-5.75 parts of ammonium bifluoride;
0-1 part of degreasing agent;
19.25-21.75 parts of water;
the total mass portion is 100 portions.
3. The aluminum alloy acid etching solution of claim 1 or 2, wherein: the degreasing agent is a compound of ferrous sulfate, dipropylene glycol and a nonionic surfactant.
4. The aluminum alloy acid etching solution of claim 3, wherein: the mass ratio of the ferrous sulfate to the dipropylene glycol to the nonionic surfactant is 1: 0.2: 0.3.
5. the aluminum alloy acid etching solution of claim 4, wherein: the nonionic surfactant is a compound of alkylphenol polyoxyethylene and fatty alcohol polyoxyethylene.
6. The aluminum alloy acid etching solution of claim 5, wherein: the mass ratio of the alkylphenol polyoxyethylene ether to the fatty alcohol polyoxyethylene ether is 1: 1.
7. a method for preparing an aluminum alloy pickling solution according to any one of claims 1 to 6, wherein the method comprises the following steps: the method comprises the following steps:
step 1), injecting water into a container, adding sulfuric acid into the water, stirring and cooling to room temperature to obtain a sulfuric acid solution;
step 2), adding nitric acid into the sulfuric acid solution, stirring and cooling to room temperature to obtain a mixed solution;
and 3) adding ammonium bifluoride and a degreasing agent into the mixed solution, and uniformly stirring to obtain the aluminum alloy acid etching solution.
8. The method for preparing the aluminum alloy acid etching solution according to claim 7, wherein the method comprises the following steps: in the step 1), when sulfuric acid is added into water, the sulfuric acid is injected at a constant speed for 10min, and in the step 2), when nitric acid is added into a sulfuric acid solution, the nitric acid is injected at a constant speed for 15 min.
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| CN104372359A (en) * | 2014-11-11 | 2015-02-25 | 无锡鸿声铝业有限公司 | Aluminum alloy surface spraying pretreatment process |
| CN107130251A (en) * | 2017-06-13 | 2017-09-05 | 东莞宜安科技股份有限公司 | A kind of aluminium alloy automobile fitting part sprays pre-treating method |
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