CN111286774A - Metal micro-arc oxidation pretreatment method - Google Patents
Metal micro-arc oxidation pretreatment method Download PDFInfo
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- CN111286774A CN111286774A CN202010117475.4A CN202010117475A CN111286774A CN 111286774 A CN111286774 A CN 111286774A CN 202010117475 A CN202010117475 A CN 202010117475A CN 111286774 A CN111286774 A CN 111286774A
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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
- 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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- 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
- C25D11/30—Anodisation of magnesium or alloys based thereon
Abstract
The invention discloses a metal micro-arc oxidation pretreatment method, and relates to the technical field of metal surface pretreatment. Which comprises the following steps: s1, blowing the metal surface by using compressed air to remove dust on the metal surface; s2, under the ultrasonic condition, immersing the metal in a cleaning agent at the temperature of 40-50 ℃ for a period of time to remove oil stains; the cleaning agent comprises the following components in parts by weight: 20-40 parts of organic acid; 15-20 parts of sodium citrate, 25-30 parts of sodium metasilicate, 1-5 parts of sodium borate, 1-5 parts of dipropylene glycol, 8-10 parts of EDTA-2Na, 6-8 parts of fatty alcohol-polyoxyethylene ether, 6-8 parts of nonylphenol polyoxyethylene ether, 3-5 parts of triethanolamine oleate soap and 5-10 parts of dodecyl dimethyl amine oxide; 20-30 parts of water. And S3, washing with hot water, and drying to finish pretreatment. The invention has the advantages of good oil stain removing effect and high oil stain removing efficiency.
Description
Technical Field
The invention relates to the technical field of metal surface pretreatment, in particular to a metal micro-arc oxidation pretreatment method.
Background
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 the matrix and excellent comprehensive mechanical property
The invention discloses a micro-arc oxidation method in a Chinese patent with an authorization publication number of CN101503812B, and mainly aims to provide a micro-arc oxidation method which saves investment and obtains a uniform micro-arc oxidation film layer on a larger area. However, the general metal section is pretreated before micro-arc oxidation, otherwise, impurities such as oil stains on the surface of the untreated metal section are dissolved in the electrolyte for micro-arc oxidation, so that the electrolyte is polluted and turbid, and the service life of the electrolyte is seriously shortened.
Therefore, a new solution is needed to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a metal micro-arc oxidation pretreatment method which has the advantages of good degreasing effect and high degreasing efficiency.
In order to achieve the purpose, the invention provides the following technical scheme:
a metal micro-arc oxidation pretreatment method comprises the following steps:
s1, blowing the metal surface by using compressed air to remove dust on the metal surface;
s2, under the ultrasonic condition, immersing the metal in a cleaning agent at the temperature of 40-50 ℃ for a period of time to remove oil stains; the cleaning agent comprises the following components in parts by weight: 20-40 parts of organic acid; 15-20 parts of sodium citrate, 25-30 parts of sodium metasilicate, 1-5 parts of sodium borate, 1-5 parts of dipropylene glycol, 8-10 parts of EDTA-2Na, 6-8 parts of fatty alcohol-polyoxyethylene ether, 6-8 parts of nonylphenol polyoxyethylene ether, 3-5 parts of triethanolamine oleate soap and 5-10 parts of dodecyl dimethyl amine oxide; 20-30 parts of water.
And S3, washing with hot water, and drying to finish pretreatment.
Through adopting above-mentioned technical scheme, adopt compressed air to sweep the metal section surface earlier in order to remove dust, avoid dust to exert an influence and destroy stability to following cleaner, then with metal section submergence under the ultrasonic condition in hot cleaner greasy dirt of getting rid of, the ultrasonic condition produces cavitation, is favorable to the cleaner to peel off metal section surface greasy dirt, makes the greasy dirt disperse in the cleaner with the emulsification form, prevents that the greasy dirt from redepositing on the metal surface again.
In the cleaning agent prepared by the invention, sodium citrate is used as a cleaning agent and a chelating agent in the cleaning agent, and has good compounding capability on grease, on one hand, sodium metasilicate has a good surface activity effect, 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 capability of the surfactant is 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 bar
More preferably, in step S1, the purge pressure is 0.1 to 0.3MPa and the flow rate of the purge air is 8 to 12 m/S.
Through adopting above-mentioned technical scheme, adopt above-mentioned air pressure and velocity of flow, can be under the condition of the biggest energy saving and sweep the dust of getting rid of the metal section surface completely.
More preferably, in step S2, the ultrasonic frequency is 30-45kHz, and the power density is 0.4-0.5 w/cm.
By adopting the technical scheme and the ultrasonic parameters, the oil stains on the surface of the metal section can be quickly and completely removed, and the oil stain removal efficiency is improved.
More preferably, the pH of the cleaning agent is 5 to 6.5.
By adopting the technical scheme, the impurities on the surface of the metal section can be quickly removed by adopting the slightly acidic cleaning agent.
Further preferably, the organic acid is an organic carboxylic acid, and includes one of tartaric acid, citric acid and gluconic acid.
By adopting the technical scheme, the invention avoids adopting inorganic acid and organic acid, can prevent the metal surface from being corroded, does not contain strong acid and strong alkali, does not corrode the surface of the crushed metal section, and does not peel off the natural oxidation film on the metal surface.
More preferably, in step S2, the metal is immersed in the cleaning agent for 3-15 min.
By adopting the technical scheme, in the actual oil stain removing process, the immersion time can be selected according to the surface stain degree of the metal section bar, so that the oil stain on the surface of the metal section bar can be removed in a short time, and the effect of quickly and stably removing the oil stain on the surface of the metal section bar is achieved.
More preferably, in step S3, the hot water washing temperature is 55 to 60 ℃.
By adopting the technical scheme, in the step S2, the cleaning agent completely dissolves the oil stains on the metal surface, so that the deposition of the oil stains on the metal surface is avoided, and then the residual oil stains on the metal surface and the cleaning agent are washed away by hot water, so that the cleanness of the metal surface is ensured.
More preferably, in step S3, the temperature of the drying is 75 to 80 ℃.
By adopting the technical scheme, hot air at 75-80 ℃ is adopted to blow water stains on the metal surface, so that the metal surface is ensured to be quickly dried and enters the subsequent micro-arc oxidation process, and the processing progress is improved.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the method comprises the following steps of firstly adopting compressed air to sweep the metal surface to blow off floating dust and dust, so as to ensure that the subsequent oil stain removal process of the cleaning agent can be smoothly carried out;
(2) the cleaning agent disclosed by the invention is compounded by multiple stable and harmless components, is stable, has a good oil stain removing effect and high oil stain removing efficiency, does not contain phosphorus, strong acid and strong base, is stable in property, has a longer service life, and is simple to operate and low in preparation cost;
(3) the degreasing agent can be used for degreasing various metal profiles, including aluminum alloy profiles, magnesium alloy profiles and the like.
Detailed Description
The present invention will be described in detail with reference to examples. It is noted that the metal profiles in the following examples were all operated using aluminum alloy profiles.
Example 1: a metal micro-arc oxidation pretreatment method comprises the following steps:
and S1, blowing the metal surface by using compressed air to remove dust on the metal surface, wherein the blowing pressure of the compressed air is 0.1Mpa, and the blowing air flow rate is 8 m/S.
S2, immersing the metal in a cleaning agent at 40 ℃ for 15min under the ultrasonic condition that the frequency is 30kHz and the power density is 0.4w/cm, and removing oil stains; the cleaning agent comprises the following components in parts by weight: 20 parts of tartaric acid; 15 parts of sodium citrate, 25 parts of sodium metasilicate, 1 part of sodium borate, 1 part of dipropylene glycol, 8 parts of EDTA-2Na, 6 parts of fatty alcohol-polyoxyethylene ether, 6 parts of nonylphenol polyoxyethylene ether, 3 parts of triethanolamine oleate soap and 5 parts of dodecyl dimethyl amine oxide; 20 parts of water, and the pH value of the cleaning agent in the embodiment is 5.
S3, washing the metal section processed in the step S2 with hot water of 55 ℃ for 0.5min, taking out the metal section and drying with hot air of 75 ℃, thus finishing the pretreatment process of metal micro-arc oxidation.
Example 2: a metal micro-arc oxidation pretreatment method comprises the following steps:
and S1, blowing the metal surface by using compressed air to remove dust on the metal surface, wherein the blowing pressure of the compressed air is 0.2Mpa, and the blowing air flow rate is 10 m/S.
S2, immersing the metal in a cleaning agent at 40 ℃ for 10min under the ultrasonic condition that the frequency is 37kHz and the power density is 0.45w/cm, and removing oil stains; the cleaning agent comprises the following components in parts by weight: 30 parts of citric acid; 18 parts of sodium citrate, 28 parts of sodium metasilicate, 3 parts of sodium borate, 3 parts of dipropylene glycol, 9 parts of EDTA-2Na, 7 parts of fatty alcohol-polyoxyethylene ether, 7 parts of nonylphenol polyoxyethylene ether, 4 parts of triethanolamine oleate soap and 8 parts of dodecyl dimethyl amine oxide; 25 parts of water, and the pH of the cleaning agent in the example is 5.5.
S3, washing the metal section processed in the step S2 with hot water of 60 ℃ for 0.5min, taking out the metal section and drying with hot air of 78 ℃, thus finishing the pretreatment process of metal micro-arc oxidation.
Example 3: a metal micro-arc oxidation pretreatment method comprises the following steps:
and S1, blowing the metal surface by using compressed air to remove dust on the metal surface, wherein the blowing pressure of the compressed air is 0.3Mpa, and the blowing air flow rate is 12 m/S.
S2, immersing the metal in a cleaning agent at 50 ℃ for 3min under the ultrasonic condition that the frequency is 45kHz and the power density is 0.5w/cm, and removing oil stains; the cleaning agent comprises the following components in parts by weight: 40 parts of gluconic acid; 20 parts of sodium citrate, 30 parts of sodium metasilicate, 5 parts of sodium borate, 5 parts of dipropylene glycol, 10 parts of EDTA-2Na, 8 parts of fatty alcohol-polyoxyethylene ether, 8 parts of nonylphenol polyoxyethylene ether, 5 parts of triethanolamine oleate soap and 10 parts of dodecyl dimethyl amine oxide; 30 parts of water, and the pH value of the cleaning agent in the embodiment is 6.
S3, washing the metal section processed in the step S2 with hot water of 60 ℃ for 0.5min, taking out the metal section and drying with hot air of 80 ℃, thus finishing the pretreatment process of metal micro-arc oxidation.
Example 4: a preparation method of a cleaning agent comprises the following steps of:
weighing dipropylene glycol according to corresponding weight parts, and mixing with 1/2 of water in total amount to obtain a mixed solvent;
b, heating the mixed solvent obtained in the step a to 50 ℃, adding fatty alcohol-polyoxyethylene ether, nonylphenol polyoxyethylene ether, triethanolamine oleate soap and dodecyl dimethyl amine oxide into the mixed solvent under the condition of heat preservation, and uniformly dispersing to obtain a mixture A;
c, adding tartaric acid, citric acid and EDTA-2Na into the rest water to dissolve, then adding sodium metasilicate and sodium borate, and stirring to dissolve to obtain a mixture B;
and d, mixing the mixture A obtained in the step B with the mixture B obtained in the step c, and performing ultrasonic treatment to uniformly disperse the mixture A and the mixture B to obtain the cleaning agent.
Comparative example 1: a metal micro-arc oxidation pretreatment method is different from the embodiment 1 in that the cleaning agent is a sulfuric acid degreasing agent with the concentration of 200 g/L.
Comparative example 2: a method for pre-treatment of metal micro-arc oxidation, which is different from the method in the embodiment 1, is characterized in that no organic acid is added into the cleaning agent, and the pH value of the cleaning agent is 7.5.
Comparative example 3: a metal micro-arc oxidation pretreatment method is different from that of the embodiment 1 in that sodium citrate and sodium metasilicate are not added into a cleaning agent.
Performance testing
The treatment effects of the metal micro-arc oxidation pretreatment methods of examples 1 to 3 and comparative examples 1 to 3 were respectively examined.
The operation method comprises the following steps: and (3) cutting the LY12 aluminum alloy section into test pieces (100mm x 2mm) with consistent sizes, cleaning the surfaces of the test pieces by using acetone, washing the test pieces by using water, drying the test pieces at 105 ℃ to constant weight to obtain clean test pieces, and weighing the clean test pieces as m 0. 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. And (3) storing the test piece with the grease in an open air environment at room temperature for 30 days, adsorbing dust on the surface of the test piece to form oil stain to obtain a simulated test piece, and weighing the simulated test piece as m 1.
Respectively adopting the metal micro-arc oxidation pretreatment methods of examples 1-3 and comparative examples 1-3 to pretreat the simulated test piece, weighing the treated simulated test piece as m 2; 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.
As can be seen from Table 1, the degreasing rate of the metal micro-arc oxidation pretreatment method of examples 1-3 can reach more than 98%, which is better than that of comparative examples 2-3, while the degreasing rate of comparative example 1 reaches 99.36%, because sulfuric acid is a strong acid, sulfuric acid also corrodes the metal surface during degreasing, resulting in weight reduction. The experimental result shows that the metal micro-arc oxidation pretreatment method has good degreasing effect and higher degreasing efficiency, does not use strong acid, strong base and phosphorus-containing substances, is safe and environment-friendly, and is convenient to operate.
Table 1 results of performance testing
| Pretreatment method | m0，g | m1，g | m2，g | Oil contamination removal rate% |
| Example 1 | 55.8731 | 56.4011 | 55.8832 | 98.09 |
| Example 2 | 55.5542 | 56.1423 | 55.5581 | 99.34 |
| Example 3 | 55.8356 | 56.4281 | 55.8426 | 98.82 |
| Comparative example 1 | 55.8198 | 56.3863 | 55.8234 | 99.36 |
| Comparative example 2 | 55.8466 | 56.4390 | 55.8934 | 92.10 |
| Comparative example 3 | 55.8231 | 56.4211 | 55.8832 | 89.95 |
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. A metal micro-arc oxidation pretreatment method is characterized by comprising the following steps:
s1, blowing the metal surface by using compressed air to remove dust on the metal surface;
s2, under the ultrasonic condition, immersing the metal in a cleaning agent at the temperature of 40-50 ℃ for a period of time to remove oil stains; the cleaning agent comprises the following components in parts by weight: 20-40 parts of organic acid; 15-20 parts of sodium citrate, 25-30 parts of sodium metasilicate, 1-5 parts of sodium borate, 1-5 parts of dipropylene glycol, 8-10 parts of EDTA-2Na, 6-8 parts of fatty alcohol-polyoxyethylene ether, 6-8 parts of nonylphenol polyoxyethylene ether, 3-5 parts of triethanolamine oleate soap and 5-10 parts of dodecyl dimethyl amine oxide; 20-30 parts of water;
and S3, washing with hot water, and drying to finish pretreatment.
2. The pre-treatment method for metal micro-arc oxidation according to claim 1, wherein in step S1, the purge pressure is 0.1-0.3MPa, and the flow rate of purge air is 8-12 m/S.
3. The method for pre-treatment of metal micro-arc oxidation according to claim 1, wherein in step S2, the ultrasonic frequency is 30-45kHz, and the power density is 0.4-0.5 w/cm.
4. The method for pre-treatment of metal micro-arc oxidation according to claim 1, wherein the pH of the cleaning agent is = 5-6.5.
5. The pre-treatment method for metal micro-arc oxidation according to claim 1, wherein the organic acid is an organic carboxylic acid and comprises one of tartaric acid, citric acid and gluconic acid.
6. The method for pre-treatment of metal micro-arc oxidation according to claim 1, wherein in step S2, the metal is immersed in the cleaning agent for 3-15 min.
7. The method for pre-treatment of metal micro-arc oxidation according to claim 1, wherein the temperature of the hot water washing in step S3 is 55-60 ℃.
8. The method for pre-treatment of metal micro-arc oxidation according to claim 1, wherein the temperature for drying is 75-80 ℃ in step S3.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112264378A (en) * | 2020-09-29 | 2021-01-26 | 中国航发动力股份有限公司 | Rust prevention method for aluminum alloy part |
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