CN109056025B - Micro-arc oxidation pretreatment method for aluminum alloy section - Google Patents
Micro-arc oxidation pretreatment method for aluminum alloy section Download PDFInfo
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- CN109056025B CN109056025B CN201811066422.3A CN201811066422A CN109056025B CN 109056025 B CN109056025 B CN 109056025B CN 201811066422 A CN201811066422 A CN 201811066422A CN 109056025 B CN109056025 B CN 109056025B
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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
- C25D11/16—Pretreatment, e.g. desmutting
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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
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/16—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions using inhibitors
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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
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/22—Light metals
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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
- C25D11/026—Anodisation with spark discharge
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Abstract
The invention relates to a micro-arc oxidation pretreatment method for an aluminum alloy section, which comprises the following steps: a) blowing the surface of the aluminum alloy section by using compressed air to remove dust; b) under the ultrasonic condition, immersing the aluminum alloy section in a cleaning agent at the temperature of 40-50 ℃ for 3-5min to remove oil stains; the cleaning agent comprises water and the following components: sodium citrate, sodium metasilicate, sodium borate, dipropylene glycol, EDTA-2Na, fatty alcohol-polyoxyethylene ether, nonylphenol polyoxyethylene ether, triethanolamine oleate soap and dodecyl dimethyl amine oxide; c) and (4) washing with hot water and drying to finish pretreatment. The method can stably and quickly wash and remove oil, and does not corrode the aluminum alloy section; the used cleaning agent has stable property, strong oil stain containing capability, good oil removing effect and longer service life; strong acid, strong base and phosphorus-containing substances are not used, the method is safe and reliable, the cleaning time is short, and the method is suitable for degreasing operation of micro-arc oxidation pretreatment of the aluminum alloy section.
Description
Technical Field
The invention belongs to the technical field of surface treatment of aluminum alloy sections, and particularly relates to a micro-arc oxidation pretreatment method for an aluminum alloy section.
Background
The aluminum is one of six metals which are widely distributed in nature, accounts for about 8.0 percent of the total mass of the earth crust, has small density and low melting point, is easy to process, and can be made into various sectional materials; however, pure aluminum has a very low strength and is not suitable as a structural material. Through long-term production practice and scientific research, people gradually add alloy elements and apply heat treatment and other methods to strengthen aluminum to obtain a series of aluminum alloys, and the aluminum alloys have higher strength while keeping the advantages of light weight and the like of pure aluminum and become ideal structural materials. Aluminum alloy profiles have been used in a large number of applications in aerospace, transportation, machinery manufacturing, construction, decorative and finishing, and chemical industries because of their advantages of lightness, low cost, high specific strength, high electrical and thermal conductivity, weldability, recyclability, and the like.
However, aluminum alloy as a structural material has the disadvantages of soft texture, poor wear resistance, non-corrosion resistance in special environment, non-high temperature resistance and the like, although aluminum alloy can spontaneously form Al on the surface in the air2O3However, the film layer is very thin and has many defects, and the substrate cannot be effectively protected, so that the performance of the aluminum alloy section bar is improved by performing surface treatment on the aluminum alloy section bar by various methods. According to the process characteristics and the properties of the obtained protective layer, the surface treatment technology of the aluminum alloy section can be divided into chemical oxidation treatment, chemical plating, thermal spraying, common anodic oxidation treatment, micro-arc oxidation treatment and the like.
The micro-arc oxidation treatment is also called micro-plasma surface ceramic technology, is a new high-voltage plasma-assisted anodic oxidation process, and is characterized in that on the basis of common anodic oxidation, arc discharge is utilized to enhance and activate reaction generated on an anode, and metal on the surface of a section bar interacts with electrolyte solution, so that a stable strengthened ceramic film layer is formed in situ under the action of factors such as high temperature, electric field and the like by micro-arc discharge on the surface of valve metal such as aluminum, magnesium, titanium and the like and alloy materials thereof. Compared with the common anodic oxidation technology, the micro-arc oxidation treatment technology has simple process, easy control and high treatment efficiency, and the surface oxide film prepared by the technology has compact structure, good combination with a matrix and excellent comprehensive mechanical property.
The process flow of the micro-arc oxidation treatment technology generally comprises pretreatment, micro-arc oxidation and post-treatment, based on the working principle of micro-arc oxidation of the aluminum alloy section, a series of chemical pretreatment processes such as degreasing, acid washing, alkali washing, neutralization and the like are not required to be strictly carried out on the surface of the section in the pretreatment process like common anodic oxidation in principle, only oil stains and dust on the surface of the aluminum alloy section need to be removed, and the alkaline electrolyte for micro-arc oxidation and the micro-arc oxidation process can play a role in cleaning the chemical pretreatment such as degreasing and the like. However, in actual operation, if micro-arc oxidation is directly carried out without pretreatment or after simple washing and drying, residual oil stains on the surface of the aluminum alloy section can enter into the micro-arc oxidized electrolyte, the electrolyte is polluted and turbid, and the service life of the electrolyte is seriously shortened; if the aluminum alloy section is subjected to chemical pretreatment by adopting a pretreatment process of common anodic oxidation, the process is multiple, the operation is complex, the cost is high, and strong acid and strong base reagents are used more, so that the damage to operators and the environment is large, and the popularization and the use are not facilitated. Therefore, there is a need to develop a micro-arc oxidation pretreatment method for aluminum alloy sections to solve the above problems.
Disclosure of Invention
The invention aims to provide a micro-arc oxidation pretreatment method for an aluminum alloy section, which does not use strong acid, strong alkali and phosphorus-containing substances, has good oil stain removal effect and does not corrode the aluminum alloy section.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a micro-arc oxidation pretreatment method for an aluminum alloy profile comprises the following steps:
a) blowing the surface of the aluminum alloy section by using compressed air to remove dust;
b) under the ultrasonic condition, immersing the aluminum alloy section in a cleaning agent at the temperature of 40-50 ℃ for 3-5min to remove oil stains;
the cleaning agent comprises the following components in concentration: 1.5-2.0g/L of sodium citrate, 2.6-2.8g/L of sodium metasilicate, 0.4-0.5g/L of sodium borate, 3.0-4.0g/L, EDTA-2Na0.8-1.0g/L of dipropylene glycol, 0.6-0.8g/L of fatty alcohol polyoxyethylene ether, 0.6-0.8g/L of nonylphenol polyoxyethylene ether, 0.3-0.4g/L of triethanolamine oleate soap, 0.6-0.8g/L of dodecyl dimethyl amine oxide and the balance of water;
c) and (4) washing with hot water and drying to finish pretreatment.
In the step a), the purging pressure is 0.2-0.3MPa, and the purging air flow rate is 5-10 m/s.
In the step b), the ultrasonic frequency is 28-40kHz, and the power density is 0.4-0.5w/cm2。
The pH value of the cleaning agent is 9-10.
The carbon atom number of the fatty alcohol-polyoxyethylene ether is 12-14.
The total concentration of the fatty alcohol-polyoxyethylene ether, the nonylphenol polyoxyethylene ether, the triethanolamine oleate soap and the dodecyl dimethyl amine oxide is not more than 2.5 g/L.
The cleaning agent is prepared by the following method:
1) mixing the dipropylene glycol with part of water according to the formula amount to obtain a mixed solvent;
2) heating the mixed solvent obtained in the step 1) to 45-50 ℃, adding the fatty alcohol-polyoxyethylene ether, the nonylphenol polyoxyethylene ether, the triethanolamine oleate soap and the dodecyl dimethyl amine oxide into the mixed solvent according to the formula ratio under the condition of heat preservation, and uniformly dispersing to obtain a mixture A;
3) adding the sodium citrate and the EDTA-2Na in the formula amount into the rest water to dissolve, then adding the sodium metasilicate and the sodium borate in the formula amount, and stirring to dissolve to obtain a mixture B;
4) mixing the mixture A obtained in the step 2) with the mixture B obtained in the step 3), and performing ultrasonic treatment to uniformly disperse the mixture A and the mixture B to obtain the material.
In the step 1), the part of water refers to 1/3-1/2 of the total water quantity.
In the step c), the hot washing refers to soaking and washing by adopting water at 55-60 ℃. The soaking time is 10-20 s.
In the step c, the drying temperature is 75-80 ℃.
The invention relates to a micro-arc oxidation pretreatment method for an aluminum alloy section, which comprises the steps of firstly adopting compressed air to sweep the surface of the aluminum alloy section so as to remove dust, and preventing floating dust and dust on the surface from entering a cleaning agent used later to pollute the cleaning agent and destroy the stability of the cleaning agent. The aluminum alloy section is immersed in a cleaning agent at 40-50 ℃ for 3-5min under the ultrasonic condition to remove oil stains, and the ultrasonic condition generates cavitation, so that the cleaning agent is favorable for removing the oil stains on the surface of the aluminum alloy section, the oil stains are dispersed in the cleaning agent in an emulsified form, and the oil stains are prevented from being redeposited.
The cleaning agent used in the method for the micro-arc oxidation pretreatment of the aluminum alloy section is prepared by compounding water, sodium citrate, sodium metasilicate, sodium borate, dipropylene glycol, EDTA-2Na, fatty alcohol-polyoxyethylene ether, nonylphenol polyoxyethylene ether, triethanolamine oleate soap and dodecyl dimethyl amine oxide. The sodium citrate is used as a cleaning agent and a coordination agent in the cleaning agent, has good dispersing capacity on grease, on one hand, the sodium metasilicate has good surface activity, and the sodium citrate and the sodium metasilicate are compounded for use, so that the comprehensive performance of an anionic surfactant and a nonionic surfactant in the components can be enhanced, and the oil removing capacity of the surfactant can be improved; on the other hand, the sodium citrate has a strong coordination effect on various metal ions, and can be matched with EDTA-2Na to complex metal ions on the surface of the aluminum alloy section bar and in oil stain and water, inhibit the adverse effect of ions existing in the cleaning agent on the oil stain removal process, and maintain the stability of the cleaning agent. The sodium metasilicate has good wettability and emulsibility, can be used as a builder to soften and shed oil stains adhered to the surface of the aluminum alloy section, and is matched with an anionic surfactant and a nonionic surfactant in the components to emulsify and disperse the oil stains in the cleaning agent, so that the stripped oil stains cannot be agglomerated into a sheet in the cleaning agent, the stability of the cleaning agent is improved, and the service life of the cleaning agent is prolonged. The sodium borate is used as a corrosion inhibitor to slow down and prevent the corrosion of the alkaline cleaning agent on the surface of the aluminum alloy section.
According to the micro-arc oxidation pretreatment method of the aluminum alloy section, the used cleaning agent is prepared by compounding fatty alcohol-polyoxyethylene ether, nonylphenol polyoxyethylene ether, triethanolamine oleate soap and dodecyl dimethyl amine oxide to serve as a degreasing agent, wherein the fatty alcohol-polyoxyethylene ether, the nonylphenol polyoxyethylene ether and the triethanolamine oleate soap are nonionic surfactants, and the dodecyl dimethyl amine oxide is a nonionic surfactant in an alkaline medium. The dipropylene glycol is used as a solubilizer, so that the dispersing capacity of each component, particularly the surfactant, is improved, the surface tension of the cleaning agent solution is reduced, and the cleaning capacity and the use stability of the cleaning agent solution are improved.
The micro-arc oxidation pretreatment method for the aluminum alloy section adopts the alkaline water-based cleaning agent, can stably and quickly wash and remove oil, does not corrode the aluminum alloy section, and does not strip a natural oxidation film on the surface of the aluminum alloy; the used cleaning agent has stable property, strong oil stain containing capability, good oil removing effect and longer service life; the pretreatment method does not use strong acid, strong base and phosphorus-containing substances, has simple operation, low cost, short cleaning time and good oil stain removal effect, and is particularly suitable for the oil stain removal operation of the micro-arc oxidation pretreatment of the aluminum alloy section.
Further, in the preparation process of the cleaning agent for the micro-arc oxidation pretreatment of the aluminum alloy section, the solubilizer dipropylene glycol is mixed with part of water to obtain a mixed solvent; adding fatty alcohol-polyoxyethylene ether, nonylphenol polyoxyethylene ether, triethanolamine oleate soap and dodecyl dimethyl amine oxide into the mixed solvent at the temperature of 45-50 ℃ for uniform dispersion; adding sodium citrate and EDTA-2Na into the rest water to dissolve, adding sodium metasilicate and sodium borate to stir and dissolve, finally mixing the mixture, and performing ultrasonic treatment to uniformly disperse the mixture. The preparation method can quickly and completely dissolve the components in the cleaning agent, thereby obtaining stable and quick washing and oil removing capability, and the preparation method has the advantages of simple process, convenient operation and suitability for popularization and use.
Detailed Description
The present invention will be further described with reference to the following embodiments.
In a specific embodiment, the sodium citrate used is sodium citrate dihydrate, and the amount of the formula is not counted by crystal water. The fatty alcohol-polyoxyethylene ether has 12 carbon atoms.
Example 1
The micro-arc oxidation pretreatment method for the aluminum alloy section comprises the following steps:
a) blowing the surface of the aluminum alloy section by using compressed air to remove dust; the purging pressure is 0.2MPa, and the purging air flow rate is 6 m/s;
b) under the ultrasonic condition, immersing the aluminum alloy section in a cleaning agent at 40 ℃ for 5min to remove oil stains;
the ultrasonic frequency is 28kHz, and the power density is 0.5w/cm2；
The cleaning agent consists of the following components in concentration: 1.5g/L of sodium citrate, 2.8g/L of sodium metasilicate, 0.5g/L of sodium borate, 3.0g/L, EDTA-2Na 1.0g/L of dipropylene glycol, 0.7g/L of fatty alcohol-polyoxyethylene ether, 0.7g/L of nonylphenol polyoxyethylene ether, 0.3g/L of triethanolamine oleate soap, 0.8g/L of dodecyl dimethyl amine oxide and the balance of water;
c) soaking in 55 deg.C water for 20s, washing, and oven drying at 75 deg.C to obtain the final product.
The cleaning agent used in the present example was prepared by the following method:
1) taking the dipropylene glycol with the formula amount and mixing the dipropylene glycol with water accounting for 1/3 of the total amount to obtain a mixed solvent;
2) heating the mixed solvent obtained in the step 1) to 50 ℃, adding fatty alcohol-polyoxyethylene ether, nonylphenol polyoxyethylene ether, triethanolamine oleate soap and dodecyl dimethyl amine oxide in formula amount into the mixed solvent under the condition of heat preservation, and uniformly dispersing to obtain a mixture A;
3) adding the sodium citrate and the EDTA-2Na in the formula amount into the rest water to dissolve, then adding the sodium metasilicate and the sodium borate in the formula amount, and stirring to dissolve to obtain a mixture B;
4) and (3) mixing the mixture A obtained in the step 2) with the mixture B obtained in the step 3), and performing ultrasonic treatment to uniformly disperse the mixture A and the mixture B to obtain the cleaning agent. The pH value of the obtained cleaning agent is 9.5 by detection.
Example 2
The micro-arc oxidation pretreatment method for the aluminum alloy section comprises the following steps:
a) blowing the surface of the aluminum alloy section by using compressed air to remove dust; the purging pressure is 0.25MPa, and the purging air flow rate is 8 m/s;
b) under the ultrasonic condition, immersing the aluminum alloy section in a cleaning agent at 45 ℃ for 4min to remove oil stains;
the ultrasonic frequency is 28kHz, and the power density is 0.5w/cm2；
The cleaning agent consists of the following components in concentration: 1.7g/L of sodium citrate, 2.7g/L of sodium metasilicate, 0.4g/L of sodium borate, 3.5g/L, EDTA-2Na dipropylene glycol, 0.9g/L of fatty alcohol-polyoxyethylene ether, 0.6g/L of nonylphenol polyoxyethylene ether, 0.4g/L of triethanolamine oleate soap, 0.7g/L of dodecyl dimethyl amine oxide and the balance of water;
c) soaking in water at 60 deg.C for 10s, washing, and oven drying at 80 deg.C to obtain the final product.
The cleaning agent used in the present example was prepared by the following method:
1) taking the dipropylene glycol with the formula amount and mixing the dipropylene glycol with water accounting for 1/2 of the total amount to obtain a mixed solvent;
2) heating the mixed solvent obtained in the step 1) to 50 ℃, adding fatty alcohol-polyoxyethylene ether, nonylphenol polyoxyethylene ether, triethanolamine oleate soap and dodecyl dimethyl amine oxide in formula amount into the mixed solvent under the condition of heat preservation, and uniformly dispersing to obtain a mixture A;
3) adding the sodium citrate and the EDTA-2Na in the formula amount into the rest water to dissolve, then adding the sodium metasilicate and the sodium borate in the formula amount, and stirring to dissolve to obtain a mixture B;
4) and (3) mixing the mixture A obtained in the step 2) with the mixture B obtained in the step 3), and performing ultrasonic treatment to uniformly disperse the mixture A and the mixture B to obtain the cleaning agent. The pH value of the obtained cleaning agent is 9.4 by detection.
Example 3
The micro-arc oxidation pretreatment method for the aluminum alloy section comprises the following steps:
a) blowing the surface of the aluminum alloy section by using compressed air to remove dust; the purging pressure is 0.3MPa, and the purging air flow rate is 10 m/s;
b) under the ultrasonic condition, immersing the aluminum alloy section in a cleaning agent at 50 ℃ for 3min to remove oil stains;
the ultrasonic frequency is 28kHz, and the power density is 0.5w/cm2；
The cleaning agent consists of the following components in concentration: 2.0g/L of sodium citrate, 2.6g/L of sodium metasilicate, 0.5g/L of sodium borate, 4.0g/L, EDTA-2Na dipropylene glycol, 0.8g/L of fatty alcohol-polyoxyethylene ether, 0.8g/L of nonylphenol polyoxyethylene ether, 0.4g/L of triethanolamine oleate soap, 0.7g/L of dodecyl dimethyl amine oxide and the balance of water;
c) soaking in water at 60 deg.C for 15s, washing, and oven drying at 80 deg.C to obtain the final product.
The cleaning agent used in the present example was prepared by the following method:
1) taking the dipropylene glycol with the formula amount and mixing the dipropylene glycol with water accounting for 1/2 of the total amount to obtain a mixed solvent;
2) heating the mixed solvent obtained in the step 1) to 45 ℃, adding fatty alcohol-polyoxyethylene ether, nonylphenol polyoxyethylene ether, triethanolamine oleate soap and dodecyl dimethyl amine oxide in formula amount into the mixed solvent under the condition of heat preservation, and uniformly dispersing to obtain a mixture A;
3) adding the sodium citrate and the EDTA-2Na in the formula amount into the rest water to dissolve, then adding the sodium metasilicate and the sodium borate in the formula amount, and stirring to dissolve to obtain a mixture B;
4) and (3) mixing the mixture A obtained in the step 2) with the mixture B obtained in the step 3), and performing ultrasonic treatment to uniformly disperse the mixture A and the mixture B to obtain the cleaning agent. The pH value of the obtained cleaning agent is 9.6 through detection.
Experimental example 1
The experimental example detects the treatment effect of the micro-arc oxidation pretreatment method for the aluminum alloy section of the embodiment 1-3. The experimental contents are as follows: cutting LY12 aluminum alloy into test pieces (100mm × 100mm × 2.0mm) with consistent size, cleaning the surface of the test pieces with acetone, washing with water, drying at 105 deg.C to constant weight to obtain clean test pieces, and weighing m0. Uniformly coating a layer of grease (the mass ratio of lubricating oil, antirust oil and mineral oil is 1:1:1) on the surface of a clean test piece, and drying at 105 ℃ to constant weight. The test piece with the grease is stored for 30 days in an open air environment at room temperature, the grease on the surface absorbs dust to form oil stain, a simulated test piece is obtained, and the weight is recorded as m1。
The aluminum alloy section bar micro-arc oxidation pretreatment methods of examples 1-3 were respectively adopted to pretreat the simulated test pieces, and the weighed pieces were recorded as m2(ii) a Each group of detection is repeated three times, and an average value is taken; the degreasing rate was calculated and the results are shown in table 1.
The comparative example was conducted using a sulfuric acid degreasing agent having a concentration of 200g/L, and the same procedure as in example 1 was conducted.
TABLE 1 results of testing the treatment effect of the micro-arc oxidation pretreatment method for aluminum alloy sections of examples 1 to 3
| Pretreatment method | m0，g | m1，g | m2，g | Oil contamination removal rate% |
| Example 1 | 55.8911 | 56.4133 | 55.8941 | 99.42 |
| Example 2 | 55.5653 | 56.1535 | 55.5694 | 99.30 |
| Example 3 | 55.8466 | 56.4390 | 55.8508 | 99.29 |
| Comparative example | 55.8299 | 56.3982 | 55.8347 | 99.25 |
As can be seen from Table 1, the oil stain removal rate of the aluminum alloy profile micro-arc oxidation pretreatment method of examples 1-3 is above 99.29%, which is better than that of the comparative example (method using sulfuric acid degreasing agent with concentration of 200 g/L). Experimental results show that the micro-arc oxidation pretreatment method for the aluminum alloy section has a good effect of removing oil stains on the surface of the aluminum alloy section, does not use strong acid, strong base and phosphorus-containing substances, and is safe, environment-friendly and convenient to operate.
In order to examine the oil stain receiving capacity of the cleaning agent used in the aluminum alloy section bar micro-arc oxidation pretreatment method, the size of the test piece is increased to 200mm multiplied by 2.0mm according to the same conditionThe method prepares a simulation test piece, and carries out micro-arc oxidation pretreatment on the aluminum alloy section bar according to the methods of the embodiments 1 to 3 respectively. The cleaning agent for the micro-arc oxidation pretreatment of the 1L aluminum alloy section is effective according to the condition that the degreasing rate is more than or equal to 99 percent, and is continuously put in and taken out for pretreatment until the degreasing rate is less than 99 percent, so that the calculation shows that the surface area of the cleaning agent for the micro-arc oxidation pretreatment of the 1L aluminum alloy section can be treated by about 1.0m2The aluminum alloy section bar simulates the oil stain on the surface of a test piece, and the oil stain containing amount is 50-60 g/L. The detection result shows that the cleaning agent used in the micro-arc oxidation pretreatment method for the aluminum alloy section has the advantages of good use stability, strong oil stain containing capability and long service life.
Experimental example 2
In order to detect the corrosivity of the aluminum alloy section micro-arc oxidation pretreatment method for the aluminum alloy section, the experimental example is to cut the LY12 aluminum section into samples of 50cm multiplied by 20cm multiplied by 2mm, clean the surfaces of the samples with acetone and wash with water, dry at 105 ℃ to constant weight to obtain clean test pieces, and weigh and record the test pieces as m0. The aluminum alloy section bar micro-arc oxidation pretreatment methods of examples 1-3 were respectively adopted to pretreat the samples, in order to ensure the calculability of the experimental data, the soaking time of the cleaning agent under the ultrasonic condition was prolonged to 1h, and the samples were weighed after the treatment and recorded as m3. Each group of detection is repeated three times, and an average value is taken; the corrosion weight loss rate was calculated and the results are shown in table 2.
The comparative example was conducted using a sulfuric acid degreasing agent having a concentration of 200g/L, and the same procedure as in example 1 was conducted.
TABLE 2 Corrosion test results of the cleaners and pretreatment methods used in examples 1-3
| Test object | Area of corrosion, m2 | m0，g | m2，g | Corrosion weight loss rate, g/(m)2·h) |
| Example 1 | 0.2 | 556.8064 | 556.7874 | 0.0951 |
| Example 2 | 0.2 | 555.4381 | 555.4222 | 0.0796 |
| Example 3 | 0.2 | 557.1923 | 557.1742 | 0.0903 |
| Comparative example | 0.2 | 556.7190 | 556.4619 | 1.2857 |
As can be seen from table 2, compared with the corrosivity of the comparative example (the method using the sulfuric acid degreasing agent) on the aluminum alloy profile matrix, the aluminum alloy profile micro-arc oxidation pretreatment method and the cleaning agent used in the method of examples 1 to 3 hardly corrode the aluminum alloy profile matrix, belong to a milder aluminum alloy profile surface degreasing and decontamination method, and are particularly suitable for the micro-arc oxidation surface treatment technology which does not need to remove the natural oxide film on the aluminum alloy profile surface in advance.
By adopting the micro-arc oxidation pretreatment method for the aluminum alloy section, the oil stain on the surface of the aluminum alloy section can be quickly and effectively removed in a short time, and the natural oxidation film on the surface is hardly damaged (the micro-arc oxidation surface treatment technology does not need to break the natural oxidation film), so that the pretreatment process is shortened, the follow-up micro-arc oxidation electrolyte is ensured not to be polluted by the oil stain on the surface of the aluminum alloy section, the service life of the electrolyte is prolonged, the resources are saved, and the cost is reduced. The micro-arc oxidation pretreatment method for the aluminum alloy section does not use strong acid, strong base and phosphorus-containing substances, has small influence on operators and environment, is safe and reliable, and is suitable for popularization and application in the technical field of micro-arc oxidation of the aluminum alloy section.
Claims (5)
1. A micro-arc oxidation pretreatment method for aluminum alloy sections is characterized by comprising the following steps: the method comprises the following steps:
a) blowing the surface of the aluminum alloy section by using compressed air to remove dust;
b) under the ultrasonic condition, immersing the aluminum alloy section in a cleaning agent at the temperature of 40-50 ℃ for 3-5min to remove oil stains;
the ultrasonic frequency is 28-40kHz, and the power density is 0.4-0.5w/cm2；
The cleaning agent consists of the following components in concentration: 1.5-2.0g/L of sodium citrate, 2.6-2.8g/L of sodium metasilicate, 0.4-0.5g/L of sodium borate, 3.0-4.0g/L, EDTA-2Na0.8-1.0g/L of dipropylene glycol, 0.6-0.8g/L of fatty alcohol-polyoxyethylene ether, 0.6-0.8g/L of nonylphenol polyoxyethylene ether, 0.3-0.4g/L of triethanolamine oleate soap, 0.6-0.8g/L of dodecyl dimethyl amine oxide and the balance of water; the pH value of the cleaning agent is 9-10;
c) hot water washing and drying to finish pretreatment;
in the step c), the hot washing refers to soaking and washing by adopting water at 55-60 ℃.
2. The aluminum alloy profile micro-arc oxidation pretreatment method as set forth in claim 1, characterized in that: in the step a), the purging pressure is 0.2-0.3MPa, and the purging air flow rate is 5-10 m/s.
3. The aluminum alloy profile micro-arc oxidation pretreatment method as set forth in claim 1, characterized in that: the carbon atom number of the fatty alcohol-polyoxyethylene ether is 12-14.
4. The aluminum alloy profile micro-arc oxidation pretreatment method as set forth in claim 1, characterized in that: the cleaning agent is prepared by the following method:
1) mixing the dipropylene glycol with part of water according to the formula amount to obtain a mixed solvent;
2) heating the mixed solvent obtained in the step 1) to 45-50 ℃, adding the fatty alcohol-polyoxyethylene ether, the nonylphenol polyoxyethylene ether, the triethanolamine oleate soap and the dodecyl dimethyl amine oxide into the mixed solvent according to the formula ratio under the condition of heat preservation, and uniformly dispersing to obtain a mixture A;
3) adding the sodium citrate and the EDTA-2Na in the formula amount into the rest water to dissolve, then adding the sodium metasilicate and the sodium borate in the formula amount, and stirring to dissolve to obtain a mixture B;
4) mixing the mixture A obtained in the step 2) with the mixture B obtained in the step 3), and performing ultrasonic treatment to uniformly disperse the mixture A and the mixture B to obtain the material.
5. The aluminum alloy profile micro-arc oxidation pretreatment method as set forth in claim 1, characterized in that: in the step c, the drying temperature is 75-80 ℃.
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