CN101597784A - A kind of method for sealing of anode oxide film of light metal material - Google Patents
A kind of method for sealing of anode oxide film of light metal material Download PDFInfo
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- CN101597784A CN101597784A CNA2008101086998A CN200810108699A CN101597784A CN 101597784 A CN101597784 A CN 101597784A CN A2008101086998 A CNA2008101086998 A CN A2008101086998A CN 200810108699 A CN200810108699 A CN 200810108699A CN 101597784 A CN101597784 A CN 101597784A
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Abstract
The invention provides a kind of method for sealing of anode oxide film of light metal material, wherein, this method comprises that the light metal material that the surface is formed with anode oxide film carries out oil paint coating.Adopt the light metal material behind the method for sealing sealing of hole of anode oxide film of light metal material provided by the invention to occur unusual through 3300-3790 hour rear surface, it is unusual to adopt light metal material behind the existing nickel acetate method for sealing sealing of hole to occur through 3400 hours rear surfaces, has illustrated that thus the light metal material behind the method for sealing sealing of hole of anode oxide film of light metal material provided by the invention does not only have nickel but also can reach sealing of hole effect preferably.
Description
Technical field
The present invention relates to a kind of method for sealing of anode oxide film of light metal material.
Background technology
Light metal material, for example aluminium, magnesium, zinc, titanium, aluminium alloy, magnesium alloy, zinc alloy and titanium alloy etc., but have that density is little, the conductive and heat-conductive ability is strong, mechanical property is excellent and advantage such as secondary processing, therefore in national economy, obtained using widely.But general easy being corroded of light metal material therefore in order to utilize light metal material better, needs to carry out surface treatment to light metal material usually and avoids light metal material to be corroded, and using more at present is that light metal material is carried out anodic oxidation.
Traditional anode oxidation process flow process is: removing oil-removing wax → chemical rightenning → anodic oxidation → sealing of hole → oven dry (per step all need wash fully), when the color to light metal material has requirement, can dye at the light metal material after the antianode oxidation before the sealing of hole.
The anode oxidation membrane of light metal material is fine and close porous layer, has higher adsorptive power, thereby be adsorbed with harmful substances easily and cause the contaminated or premature corrosion of light metal material, therefore for fear of because of being adsorbed with the contaminated or premature corrosion of harmful substances, need the light metal material after the antianode oxidation to carry out the sealing of hole processing.Industrial method for sealing commonly used has hydration sealing of hole, metal salt solution sealing of hole.
(1) hydration sealing of hole
The hydration sealing of hole comprises boiling water sealing hole and normal pressure, steam under pressure sealing of hole.The anodizing of aluminium film has the reaction of two kinds of forms in water; The one,, below 80 ℃, in the water of pH＜4, be combined into Bayer body hibbsite with water, this combination only is physical bond, is reversible.Another kind is in the neutral water more than 80 ℃, the monohydrate alumina of aluminum oxide and aquation composite wave rice build, the common reaction process of the hydration sealing of hole of indication that Here it is, because density (3014kg/ cubic meter) ratio aluminum oxide (3420kg/ cubic meter) of monohydrate alumina is little, volume increases about 33%, has stopped up the hole of oxide film.The another kind of method of hydration sealing of hole is the steam sealing of hole, and its handled oxide film corrosion stability, wear resistance are relevant with the sealing of hole time with vapor pressure.In general, reduce, can not satisfy the requirement of corrosion stability and wear resistance simultaneously with pressure rising, time lengthening, corrosion stability raising, wear resistance.For this reason, developed the metal salt solution sealing of hole.
(2) metal salt solution sealing of hole
Sealing of hole in metal salt solution, the hydration reaction of oxide film had both taken place, precipitate the process of separating out thereby exist the new metal complex of saline hydrolysis generation oxyhydroxide or metal ion and dye molecule reaction generation again in membrane pores, their actings in conjunction make pore closure.This treatment process is also referred to as the precipitation sealing of hole.What often use is nickel salt solution, and its sealing of hole is effective.
A kind of aluminium and aluminium alloy anode oxide film ordinary-temp pore-sealing liquid and compound method thereof are for example disclosed among the patent CN 1074956A, wherein, this pore-sealing liquid contains the single nickel salt of 1.0-3.0 grams per liter, the fluoroboric acid of 1.5-4.5 grams per liter, the nickel acetate of 0-4 grams per liter, the sodium hydroxide of 0.4-2.5 grams per liter;
The compound method of this ordinary-temp pore-sealing liquid comprises following step: (1) is that 30% fluoroboric acid is put into acid-resistant tank with content; (2) nickelous carbonate is joined in the above-mentioned fluoborate solution lentamente, the limit edged stirs, and dissolves fully until nickelous carbonate; (3) be the 0.5-1.5 grams per liter with being diluted with water to nickel ion content in the above-mentioned solution adding sealing of hole groove; (4) regulate the pH of above-mentioned mixing solutions between 5.0-7.0 with 50% sodium hydroxide solution.
The sealing quality of above-mentioned method for sealing is better, and all there is the halfway phenomenon of sealing of hole in other method for sealing.But because nickel is heavy metal material, the light metal material surface nickel content of using the nickel salt solution method for sealing to obtain is higher, harmful, therefore presses for a kind of no nickel hole sealing technology of exploitation.
Summary of the invention
The objective of the invention is for the nickeliferous defective of light metal material behind the method for sealing sealing of hole that overcomes the anode oxide film that uses existing light metal material, a kind of effective and method for sealing of the anode oxide film of nickeliferous light metal material not is provided.
The invention provides a kind of method for sealing of anode oxide film of light metal material, wherein, this method comprises that the light metal material that the surface is formed with anode oxide film carries out oil paint coating.
From the data of table 1 as can be seen, adopt the light metal material behind the method for sealing sealing of hole of anode oxide film of light metal material provided by the invention to occur unusual through 3300-3790 hour rear surface, it is unusual to adopt light metal material behind the existing nickel acetate method for sealing sealing of hole to occur through 3400 hours rear surfaces, has illustrated that thus the light metal material behind the method for sealing sealing of hole of anode oxide film of light metal material provided by the invention does not only have nickel but also can reach sealing of hole effect preferably.
Embodiment
The invention provides a kind of method for sealing of anode oxide film of light metal material, wherein, this method comprises that the light metal material that the surface is formed with anode oxide film carries out oil paint coating.
Oil paint coating described in the present invention is included in and applies finish paint on the anode oxide film and finish paint is solidified, and forming thickness is the top coat layer of 15-65 micron.
Described finish paint can be thermofixation finish paint and/or ultra-violet curing finish paint, and described curing can be thermofixation or UV curing; The method of thermofixation can comprise that the temperature of heating can be 100-250 ℃ with the finish paint heating, and can be 15-40 minute heat-up time; UV solidified method can comprise with UV-irradiation finish paint surface, the time of irradiation can be 1-3 minute, the ultraviolet light intensity can be 1000-1300 milli Jiao/square centimeter, and wavelength can be the 360-370 nanometer, and the distance of finish paint and light source can be 25-100 centimetre.
Described finish paint can be for well known to a person skilled in the art various functional finish paints, for example can be wear-resisting for having, fast light, the functional finish paint of function such as protection against corrosion, diamagnetic or radioprotective.What use in the embodiment of the invention is the anti-UV clear lacquer of long sincere coating (Guangdong) company limited of Akzo Nobel.
When the color to light metal material had requirement, described oil paint coating can also be included in and form before the described top coat layer, applies colored paint and colored paint is solidified on anode oxide film, and forming thickness is the colored paint layer of 10-20 micron.The method of cured colored paint can comprise the heating colored paint, and the temperature of heating can be 100-250 ℃, and the time of heating can be 15-40 minute.
Described colored paint can generally can for example can be versicolor colored paints such as redness, yellow, blueness, green, purple, black or white for containing the colored paint of polyurethanes compound for well known to a person skilled in the art versicolor colored paint.What use in the embodiment of the invention is the lilac colored paint of long sincere coating (Guangdong) SC-D-R24074 of company limited of the Akzo Nobel trade mark.
Generally, in order to strengthen the surface decoration effect of metallic substance, metallic substance is carried out need carrying out surface treatments such as wire drawing, CD line, sandblast and radium carving figure to the metallic surface before the anodic oxidation, but, cannot see the superficial makings of metallic substance behind the final oil paint coating owing to the flow leveling of colored paint.Therefore, under the preferable case, when the color to light metal material had requirement, described oil paint coating can also be included in and form before the described top coat layer, coating dyestuff and oven dry on anode oxide film.
The method of coating dyestuff is for impregnated in the light metal material after the anodic oxidation in the aqueous dye solutions on anode oxide film.
Described dyestuff can be for well known to a person skilled in the art versicolor dyestuff, generally can be water-soluble organic dye, for example can be versicolor dyestuffs such as redness, yellow, blueness, green, purple, black or white, the temperature of dipping can be 40-50 ℃, in addition, can select suitable dipping time according to the depth of required color, generally can be 0.5-6 minute.Temperature during described oven dry dyestuff can be 50-90 ℃, and the time can be 5-25 minute.The concentration of dyestuff can be the 1-15 grams per liter in the aqueous dye solutions.Because dye adsorption in the micropore of anode oxide film, can not resemble the decorative effect that covers the metallic surface texture the colored paint because of levelling property and opacity.
Before the further preferred oven dry, the light metal material after will dyeing in air-flow earlier dries up.The temperature of described air-flow can be 30-40 ℃, and the speed of described air-flow can be the 5-10 meter per second, described air-flow can for not with the inert gas flow of light metal material reaction, also can be the airflow of cleaning.According to this preferred implementation, the moisture on the light metal material surface after will dyeing in air-flow earlier before the oven dry dyestuff dries up, in the time of can preventing from directly to dry dyestuff, higher bake out temperature causes fenestra and water that self-enclosed reaction takes place, thereby influence the phenomenon of the carrying out of follow-up coating finish paint, so can further improve the erosion resistance of the light metal material behind the sealing of hole.Oven dry is for to toast at baking box described in the present invention.
Light metal material described in the present invention can be aluminium, magnesium, zinc, titanium, aluminium alloy, magnesium alloy, zinc alloy or titanium alloy.The thickness of described anode oxide film is generally the 0.5-18 micron.
Below will be for a more detailed description to the present invention by embodiment.Among each embodiment, unless specified otherwise, the solvent of used solution is water.The thickness tester of the Pocket-Surfix FN2.2 model that the thickness of rete is produced with German PHYNIX company among the embodiment records.The electrostatic coating equipment paint sprayer NDL-Q2 that all produces with the outstanding Electronics Co., Ltd. of the municipal intelligence in Wuhan among the embodiment sprays colored paint and finish paint, and the NMT-1950 type baking box of producing with Shenzhen Nai Meite company toasts.
Embodiment 1
This embodiment illustrates the method for sealing of the anode oxide film of light metal material provided by the invention.
1, pre-treatment
(1) removing oil-removing wax
The model that will have anaglyph be 6061 aluminum alloy base material to be immersed in 40 grams per liters, temperature be that 60 ℃ alloy removes in oil-bound distemper (purchase in the LD-208 alloy that Shenzhen's moral is contained chemical industry company limited and the remove oil-bound distemper) solution and takes out after 5 minutes, the alloy that water cleans substrate surface removes oil-bound distemper.
(2) chemical rightenning
Impregnated in the above-mentioned aluminum alloy base material that carries out behind the removing oil-removing wax by concentration is chemical rightenning after 5 seconds in the solution formed of the phosphoric acid of 700 grams per liters and sulfuric acid that concentration is 200 grams per liters, impregnated in immediately in the water to clean the residual acid of substrate surface, then base material be impregnated in the sodium hydroxide solution of 10 grams per liters after 10 minutes, impregnated in the residual alkali that cleans substrate surface in the water immediately.
2, anodic oxidation
The above-mentioned base material that carries out after the pre-treatment is immersed in the electrolytic solution as anode, simultaneously with stainless steel as negative electrode, negative electrode is connected with negative electricity with the positive pole of power supply respectively with anode.The solution that employing is made up of the Tai-Ace S 150 of the sulfuric acid of 180 grams per liters, 8 grams per liters is as electrolytic solution, and regulating volts DS is 13 volts, carries out anodic oxidation 35 minutes.Recording substrate surface, to form thickness be 13 microns anode oxide film.Base material after the anodic oxidation was toasted 0.5 hour in 100 ℃ baking oven.
3, sealing of hole
The anti-UV clear lacquer of producing in the above-mentioned long sincere coating (Guangdong) of substrate surface spraying Akzo Nobel company limited after carrying out anodic oxidation with spray gun, solidifying in the case with 1000 milli Jiao/square centimeters, wavelength at UV then is that the ultraviolet ray of 360 nanometers is shone from the one side that has applied the anti-UV clear lacquer in the place of 25 centimetres of distance base materials and finished UV curing in 1 minute, and the thickness that records the top coat layer of formation is 15 microns.
Comparative Examples 1
This Comparative Examples illustrates the method for sealing of the anode oxide film of existing light metal material.
Is that 6061 aluminum alloy base material carries out pre-treatment, anodic oxidation and sealing of hole with the method identical with embodiment 1 to the model with anaglyph, and different is to carry out sealing of hole with the following method.
50 gram nickelous carbonates slowly are added in 300 milliliters 30% the technical grade fluoroboric acid, the limit edged stirs until dissolving fully, thin up becomes 500 milliliters of sealing of hole strong solutions then, above-mentioned strong solution is further diluted, sodium hydroxide adjust pH with 50%, measuring nickel ion concentration with volumetry is 0.6 grams per liter, surveying fluorinion concentration with fluoride ion electrode is 0.53 grams per liter, surveying the pH value with pH meter is 5.0, makes ordinary-temp pore-sealing liquid.
To immerse in the above-mentioned pore-sealing liquid through pre-treatment and anodised base material and carry out sealing of hole in 10 minutes.
Embodiment 2
This embodiment illustrates the method for sealing of the anode oxide film of light metal material provided by the invention.
Is that the magnesium alloy base material of AZ91D carries out pre-treatment, anodic oxidation and sealing of hole with the method identical with embodiment 1 to the model with anaglyph, different is, in the anodic oxidation, anodizing time is 1 minute, and recording substrate surface, to form thickness be 0.5 micron anode oxide film; In addition, in the sealing of hole, behind the spraying UV clear lacquer, solidifying in the case with 1300 milli Jiao/square centimeters, wavelength at UV then is that the ultraviolet ray of 370 nanometers is shone from the one side that has applied the anti-UV clear lacquer in the place of 100 centimetres of distance base materials and finished UV curing in 3 minutes, and the thickness that records the top coat layer of formation is 65 microns.
Embodiment 3
This embodiment illustrates the method for sealing of the anode oxide film of light metal material provided by the invention.
With the method identical with embodiment 1 model with anaglyph is carried out pre-treatment, anodic oxidation and sealing of hole for the zinc-base material, different is, in the anodic oxidation, anodizing time is 40 minutes, and recording substrate surface, to form thickness be 18 microns anode oxide film; In addition, in the sealing of hole, behind the spraying UV clear lacquer, solidifying in the case with 1100 milli Jiao/square centimeters, wavelength at UV then is that the ultraviolet ray of 365 nanometers is shone from the one side that has applied the anti-UV clear lacquer in the place of 55 centimetres of distance base materials and finished UV curing in 2 minutes, and the thickness that records the top coat layer of formation is 40 microns.
Embodiment 4
This embodiment illustrates the method for sealing of the anode oxide film of light metal material provided by the invention.
Is that 6061 aluminum alloy base material carries out pre-treatment, anodic oxidation and sealing of hole with the method identical with embodiment 1 to the model with anaglyph, and different is to carry out sealing of hole with the following method.
Spray the lilac colored paint of the SC-D-R24074 of the long sincere coating (Guangdong) of Akzo Nobel company limited production with the substrate surface of spray gun after carrying out anodic oxidation, 100 ℃ oven for baking 40 minutes, the thickness that records the colored paint layer of formation was 10 microns then.
Be formed with the anti-UV clear lacquer of the long sincere coating (Guangdong) of the substrate surface spraying Akzo Nobel company limited production of colored paint layer on above-mentioned surface with spray gun, toast under 100 ℃ in baking oven then and finished thermofixation in 40 minutes, the thickness that records the top coat layer of formation is 15 microns.
Embodiment 5
This embodiment illustrates the method for sealing of the anode oxide film of light metal material provided by the invention.
Is that the titanium alloy base material of TA2 carries out pre-treatment, anodic oxidation and sealing of hole with the method identical with embodiment 1 to the model with anaglyph, and different is to carry out sealing of hole with the following method.
Spray the lilac colored paint of the SC-D-R24074 of the long sincere coating (Guangdong) of Akzo Nobel company limited production with the substrate surface of spray gun after carrying out anodic oxidation, toasted 15 minutes in 250 ℃ baking oven then, the thickness that records the colored paint layer of formation is 20 microns.
Be formed with the anti-UV clear lacquer of the long sincere coating (Guangdong) of the substrate surface spraying Akzo Nobel company limited production of colored paint layer on above-mentioned surface with spray gun, toast under 250 ℃ in baking oven then and finished thermofixation in 15 minutes, the thickness that records the top coat layer of formation is 65 microns.
Embodiment 6
This embodiment illustrates the method for sealing of the anode oxide film of light metal material provided by the invention.
Is that 6061 aluminum alloy base material carries out pre-treatment, anodic oxidation and sealing of hole with the method identical with embodiment 1 to the model with anaglyph, and different is to carry out sealing of hole with the following method.
Spray the lilac colored paint of the SC-D-R24074 of the long sincere coating (Guangdong) of Akzo Nobel company limited production with the substrate surface of spray gun after carrying out anodic oxidation, toasted 30 minutes in 150 ℃ baking oven then, the thickness that records the colored paint layer of formation is 15 microns.
Be formed with the anti-UV clear lacquer of the long sincere coating (Guangdong) of the substrate surface spraying Akzo Nobel company limited production of colored paint layer on above-mentioned surface with spray gun, toast under 150 ℃ in baking oven then and finished thermofixation in 25 minutes, the thickness that records the top coat layer of formation is 40 microns.
Embodiment 7
This embodiment illustrates the method for sealing of the anode oxide film of light metal material provided by the invention.
Is that 6061 aluminum alloy base material carries out pre-treatment, anodic oxidation and sealing of hole with the method identical with embodiment 1 to the model with anaglyph, and different is to apply earlier dyestuff with the following method in the sealing of hole before the coating finish paint.
To carry out base material after the anodic oxidation and impregnated in orchil (purchasing) aqueous solution of 40 ℃ 1 grams per liter 6 minutes in the Far East, Shenzhen plastic cement dyestuff company, after the flowing water cleaning, with 30 ℃ speed is that the airflow of 5 meter per seconds dries up base material, then 50 ℃ oven for baking 25 minutes.
Embodiment 8
This embodiment illustrates the method for sealing of the anode oxide film of light metal material provided by the invention.
Is that 6061 aluminum alloy base material carries out pre-treatment, anodic oxidation and sealing of hole with the method identical with embodiment 1 to the model with anaglyph, and different is to apply earlier dyestuff with the following method in the sealing of hole before the coating finish paint.
To carry out base material after the anodic oxidation and impregnated in orchil (purchasing) aqueous solution of 50 ℃ 15 grams per liters 0.5 minute in the Far East, Shenzhen plastic cement dyestuff company, after the flowing water cleaning, with 35 ℃ speed is that the airflow of 10 meter per seconds dries up base material, then 90 ℃ oven for baking 5 minutes.
Embodiment 9
This embodiment illustrates the method for sealing of the anode oxide film of light metal material provided by the invention.
Is that 6061 aluminum alloy base material carries out pre-treatment, anodic oxidation and sealing of hole with the method identical with embodiment 1 to the model with anaglyph, and different is to apply earlier dyestuff with the following method in the sealing of hole before the coating finish paint.
To carry out base material after the anodic oxidation and impregnated in orchil (purchasing) aqueous solution of 45 ℃ 7 grams per liters 3 minutes in the Far East, Shenzhen plastic cement dyestuff company, after the flowing water cleaning, with 40 ℃ speed is that the airflow of 8 meter per seconds dries up base material, then 70 ℃ oven for baking 15 minutes.
Embodiment 10
This embodiment illustrates the method for sealing of the anode oxide film of light metal material provided by the invention.
Is that 6061 aluminum alloy base material carries out pre-treatment, anodic oxidation and sealing of hole with the method identical with embodiment 9 to the model with anaglyph, and different is, does not dry up with airflow behind the coating dyestuff in the sealing of hole, directly toasts in baking oven.
Light metal material among the difference visual inspection embodiment 1-10 behind the sealing of hole, found that anaglyph that can't see the light metal material surface behind the sealing of hole among the embodiment 4-6, can see the anaglyph on the light metal material surface behind the sealing of hole among embodiment 1-3 and the 7-10.
Embodiment 11-20
This embodiment illustrates the erosion resistance of the light metal material behind the method for sealing sealing of hole of the anode oxide film that adopts light metal material provided by the invention.
Adopt the following method erosion resistance of carrying out the light metal material behind the sealing of hole of test implementation example 1-10 respectively.
Erosion resistance is weighed by salt-fog test, the salt-fog test method is that base material places in the YWX/Q-250 type salt-mist corrosion tester of Wuxi City southern Jiangsu testing installation company limited production, at 35 ℃ is that the sodium chloride aqueous solution splash of 5 weight % is after 16 hours with concentration down, base material being placed the another one temperature after the taking-up is that 40 ℃, relative humidity are 80% climatic chamber again, observe base material, be recorded in how long the back substrate surface occurs unusually, the time is long more, illustrates that the erosion resistance of rete is good more.Test result is as shown in table 1 below.
Comparative Examples 2
This Comparative Examples is used to illustrate the erosion resistance of the light metal material behind the method for sealing sealing of hole of anode oxide film of light metal material of Comparative Examples 1.
Erosion resistance with light metal material behind the sealing of hole of the method difference test comparison example 1 identical with embodiment 11-20.Test result is as shown in table 1 below.
Table 1
| Numbering | Erosion resistance (hour) |
| Embodiment 11 | 3300 |
| Comparative Examples 2 | 3400 |
| Embodiment 12 | 3500 |
| Embodiment 13 | 3420 |
| Embodiment 14 | 3750 |
| Embodiment 15 | 3660 |
| Embodiment 16 | 3790 |
| Embodiment 17 | 3540 |
| Embodiment 18 | 3490 |
| Embodiment 19 | 3610 |
| Embodiment 20 | 3390 |
From the data of table 1 as can be seen, adopt the light metal material behind the method for sealing sealing of hole of anode oxide film of light metal material provided by the invention to occur unusual through 3300-3790 hour rear surface, it is unusual to adopt light metal material behind the existing nickel acetate method for sealing sealing of hole to occur through 3400 hours rear surfaces, has illustrated that thus the light metal material behind the method for sealing sealing of hole of anode oxide film of light metal material provided by the invention does not only have nickel but also can reach sealing of hole effect preferably.
Claims (10)
1, a kind of method for sealing of anode oxide film of light metal material is characterized in that, this method comprises that the light metal material that the surface is formed with anode oxide film carries out oil paint coating.
2, method according to claim 1, wherein, described oil paint coating is included in and applies finish paint on the anode oxide film and finish paint is solidified, and forming thickness is the top coat layer of 15-65 micron.
3, method according to claim 2, wherein, described finish paint is thermofixation finish paint and/or ultra-violet curing finish paint, described thermofixation or the UV of being cured as solidifies; The method of thermofixation comprises that the temperature of heating is 100-250 ℃ with the finish paint heating, and be 15-40 minute heat-up time; UV solidified method comprises that the time of irradiation is 1-3 minute with UV-irradiation finish paint surface, and the ultraviolet light intensity is a 1000-1300 milli Jiao/square centimeter, and wavelength is the 360-370 nanometer, and the distance of finish paint and light source is 25-100 centimetre.
4, method according to claim 2, wherein, described oil paint coating also is included in and forms before the described top coat layer, applies colored paint and colored paint is solidified on anode oxide film, and forming thickness is the colored paint layer of 10-20 micron.
5, method according to claim 4, wherein, the method for cured colored paint comprises the heating colored paint, and the temperature of heating is 100-250 ℃, and the time of heating is 15-40 minute.
6, according to claim 2 or 4 described methods, wherein, described oil paint coating also is included in and forms before the described top coat layer, coating dyestuff and oven dry on anode oxide film.
7, method according to claim 6, wherein, the method of coating dyestuff is for impregnated in the light metal material after the anodic oxidation in the aqueous dye solutions on anode oxide film, the temperature of dipping is 40-50 ℃, dipping time is 0.5-6 minute, temperature during described oven dry dyestuff is 50-90 ℃, and the time is 5-25 minute, and the concentration of dyestuff is the 1-15 grams per liter in the aqueous dye solutions.
8, method according to claim 6, wherein, before described oil paint coating also comprised oven dry, the light metal material after will dyeing in air-flow dried up.
9, method according to claim 8, wherein, the temperature of described air-flow is 30-40 ℃, the speed of described air-flow is the 5-10 meter per second.
10, method according to claim 1, wherein, described light metal material is aluminium, magnesium, zinc, titanium, aluminium alloy, magnesium alloy, zinc alloy or titanium alloy, the thickness of described anode oxide film is the 0.5-18 micron.
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| CN101293460B (en) * | 2007-04-24 | 2011-08-17 | 比亚迪股份有限公司 | Surface decoration method for light metal material |
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