CN108103550A - A kind of illuminating colour and aluminum alloy die casting brown colouration method - Google Patents
A kind of illuminating colour and aluminum alloy die casting brown colouration method Download PDFInfo
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- CN108103550A CN108103550A CN201711400348.XA CN201711400348A CN108103550A CN 108103550 A CN108103550 A CN 108103550A CN 201711400348 A CN201711400348 A CN 201711400348A CN 108103550 A CN108103550 A CN 108103550A
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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
- C25D11/14—Producing integrally coloured layers
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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
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
- C25D11/246—Chemical after-treatment for sealing layers
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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
- C25D9/00—Electrolytic coating other than with metals
- C25D9/02—Electrolytic coating other than with metals with organic materials
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- General Chemical & Material Sciences (AREA)
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a kind of illuminating colour and aluminum alloy die casting brown colouration methods, belong to aluminum alloy die casting coloring field.The illuminating colour is to include：The aqueous solution of acid red, acid black and glacial acetic acid, wherein, the concentration of the acid red is 4 12g/L, and the concentration of the acid black is 0.2 2.5g/L, and the concentration of the glacial acetic acid is 0.1 5g/L.The described method includes：Aluminum alloy die casting is coloured using illuminating colour, the illuminating colour is to include：The aqueous solution of acid red, acid black and glacial acetic acid.Illuminating colour provided in an embodiment of the present invention can carry out aluminum alloy die casting brown colouration, and aluminum alloy die casting is colored as brown by aluminum alloy die casting brown colouration method provided in an embodiment of the present invention, and with metallic luster.
Description
Technical field
The present invention relates to aluminum alloy die castings to colour field, more particularly to a kind of illuminating colour and aluminum alloy die casting brown
Color method.
Background technology
Alloy colouring refers to that aluminium alloy passes through the table in aluminium alloy the methods of chemical impregnation, electrochemical process and heat treating process
Face forms one layer of film layer for carrying certain color, and the film layer has certain anti-corrosion capability.
Aluminum alloy die casting can only be colored as to bronze color method at present, aluminum alloy die casting can't be coloured to palm fibre
Color, the bronze colour color method include being passivated the surface of aluminium alloy to be colored, at anodic oxidation, coloring and closing
Reason, in coloring treatment, using acid dark-blue, alizarin yellow and glacial acetic acid as illuminating colour.
In the implementation of the present invention, inventor has found that the prior art has at least the following problems：
The coloring color of existing aluminum alloy die casting is single, and cannot aluminum alloy die casting be coloured to brown, this limit
The application range of aluminum alloy die casting is determined.
The content of the invention
In order to solve the problems, such as that aluminum alloy die casting coloring color of the prior art is single, an embodiment of the present invention provides
A kind of illuminating colour and aluminum alloy die casting brown colouration method.The technical solution is as follows：
On the one hand, an embodiment of the present invention provides a kind of illuminating colour, the illuminating colour is to include：Acid red, acidity
Black and glacial acetic acid aqueous solution, wherein, the concentration of the acid red is 4-12g/L, and the concentration of the acid black is 0.2-2.5g/
L, the concentration of the glacial acetic acid is 0.1-5g/L.
On the other hand, an embodiment of the present invention provides a kind of aluminum alloy die casting brown colouration method, the described method includes：
Aluminum alloy die casting is coloured using illuminating colour, the illuminating colour is to include：Acid red, acid black and
The aqueous solution of glacial acetic acid, wherein, the concentration of the acid red is 4-12g/L, and the concentration of the acid black is 0.2-2.5g/L, institute
The concentration for stating glacial acetic acid is 0.1-5g/L.
Specifically, the coloration temperature is 40-65 DEG C, and the coloration time is 5-20min.
Specifically, before the aluminum alloy die casting is coloured, the aluminum alloy die casting is subjected to coloring pretreatment,
The coloring pretreatment includes：
The aluminum alloy die casting is placed in concentrated nitric acid and impregnates 5-10s；Wherein, the concentration of concentrated nitric acid can be 85%.
Using fine aluminium as anode, will cathode, juxtaposition be used as by the aluminum alloy die casting after concentrated nitric acid immersion treatment
Coloring pretreatment is carried out in pretreatment fluid in colouring, the reaction temperature of the coloring pretreatment is 20-35 DEG C, the pre- place of coloring
The voltage of reason is 5-10V, current density 0.1-0.5A/dm2, the time of the coloring pretreatment is 0.5-2min；
The aluminum alloy die casting is heated into 6-12h at 80-90 DEG C.
Specifically, the coloring pretreatment fluid is the aqueous solution for including aluminum sulfate and glacial acetic acid, the concentration of the aluminum sulfate
For 0.5-2g/L, the concentration of the glacial acetic acid is 1-3g/L.
Further, the aluminum alloy die casting is subjected to anodized, the anodic oxidation before the coloring
Method include：The aluminum alloy die casting is placed in the sulfuric acid solution that concentration is 180-220g/L, the anodic oxidation
Temperature is 5-20 DEG C, and the voltage of the anodic oxidation is 8-18V, and the current density of the anodic oxidation is 0.8-1.5A/dm2。
Further, surface preparation is carried out to the aluminum alloy die casting before the anodic oxidation, the surface is pre-
The method of processing includes：
Remove remaining greasy dirt on the aluminum alloy die casting；
The surface of the aluminum alloy die casting is polished；
Wash the aluminum alloy die casting；
The aluminum alloy die casting is placed in concentrated nitric acid and impregnates 5-10min, obtains surface covered with described in passivating film
Aluminum alloy die casting；
The anodic oxidation is used for after the aluminum alloy die casting is cleaned.
Specifically, by the aluminum alloy die casting after coloring by washing and carrying out Seal treatment, the Seal treatment
Method include：The aluminum alloy die casting is placed in lock solution, the temperature of the Seal treatment is 80-85 DEG C, described
The time of Seal treatment is 15-20min.
Further, the lock solution is to include：The aqueous solution of nickel sulfate, cobaltous sulfate and sodium acetate, wherein, the sulphur
The concentration of sour nickel is 4.2g/L, and the concentration of the cobaltous sulfate is 0.7g/L, and the concentration of sodium acetate is 4.8g/L, the lock solution
PH value be 4.5-5.5.
Further, will be processed by shot blasting by the aluminum alloy die casting of Seal treatment.
The advantageous effect that technical solution provided in an embodiment of the present invention is brought is：Illuminating colour provided in an embodiment of the present invention
Aluminum alloy die casting can be colored as to brown, and the aluminum alloy die casting after dyeing is rich in metallic luster, the embodiment of the present invention
Aluminum alloy die casting is dyed brown by the aluminum alloy die casting brown colouration method of offer by illuminating colour, and after dyeing
Suppressing aluminium alloy has metallic luster.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the flow chart of aluminum alloy die casting brown colouration method provided by Embodiment 2 of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
The present embodiment provides acid red, acid black and glacial acetic acid to buy in being purchased from Chemical market.
Embodiment one
An embodiment of the present invention provides a kind of illuminating colour, which includes：Acid red, acid black and glacial acetic acid,
Wherein, the concentration of acid red is 4-12g/L, and the concentration of acid black is 0.2-2.5g/L, and the concentration of the glacial acetic acid is 0.1-5g/
L.The illuminating colour is suitable for coloring silumin die casting, wherein, silumin die casting refers to silicone content more than 10%
Aluminum alloy die casting.
Since acid red, the molecular weight of acid black and glacial acetic acid in the illuminating colour of the present invention are respectively less than 1000, according to
Dalton empirical table, molecular weight 1000, then corresponding aperture is 0.001 μm, meanwhile, which is utilized 1nm's
Filter membrane is filtered, which can pass through filter membrane, it was demonstrated that the illuminating colour is less than 1nm.
Illuminating colour provided in an embodiment of the present invention can colour aluminum alloy die casting, the aluminium alloy pressure after coloring
Casting is blackish green, and with metallic luster, which increase the colors of colored aluminum alloy die casting.Meanwhile the illuminating colour
Granular size is respectively less than 1nm, due to capillary absorption effect so that the illuminating colour is easy to be adsorbed to the hole of anode oxide film
Depths, and make the aluminum alloy die casting after coloring that there is higher color fastness.
Embodiment two
An embodiment of the present invention provides a kind of aluminum alloy die casting brown colouration method, this method is suitable for closing high sial
Golden die casting is coloured, wherein, silumin die casting refers to the aluminum alloy die casting that silicone content is more than 10%, with reference to Fig. 1,
This method includes：
Step 1：Surface preparation, including：
Remove remaining greasy dirt on aluminum alloy die casting；Specifically, chemical method may be employed, such as acid solution or caustic dip
Etc. modes remove remaining greasy dirt on aluminum alloy die casting.
The surface of aluminum alloy die casting is polished；Specifically, the method that mechanical polishing or chemical polishing may be employed
The surface of aluminum alloy die casting is polished.
Wash aluminum alloy die casting；
Aluminum alloy die casting is placed in concentrated nitric acid and impregnates 5-10min, obtains aluminium alloy pressure of the surface covered with passivating film
Casting；
After washing aluminum alloy die casting of the surface covered with passivating film and dried.
Step 2：Anodized, the method for anodic oxidation include：Aluminum alloy die casting is placed in concentration as 180-
In the sulfuric acid solution of 220g/L, the temperature of anodic oxidation is 5-20 DEG C, and the voltage of anodic oxidation is 8-18V, the electricity of anodic oxidation
Current density is 0.8-1.5A/dm2.The oxide film of high quality of water white transparency is obtained after anodic oxidation.Wash the aluminium after anodic oxidation
Alloy pressuring casting is simultaneously dried.It is meanwhile big by the hole of the anode oxide film on scanning electron microscope subsidiary aluminum alloy die casting
Small, the aperture for measuring the hole of anode oxide film is 10-15nm, obtains anode oxide film by stripping method, polishes anodic oxidation
Through hole is exposed in the bottom of film, and the thickness that film is measured microscopically with instrument is 10-15 μm, the depth of this thickness i.e. hole.
Step 3：Coloring pretreatment, 1) aluminum alloy die casting is placed in concentrated nitric acid after immersion 5-10s and is washed；
2) using fine aluminium as anode, will cathode be used as by the aluminum alloy die casting after concentrated nitric acid immersion treatment, be placed in
Coloring pretreatment is carried out in coloring pretreatment fluid, and coloring pretreatment fluid is the aqueous solution for including aluminum sulfate and glacial acetic acid, aluminum sulfate
Concentration for 0.5-2g/L, the concentration of glacial acetic acid is 1-3g/L glacial acetic acid, colours the reaction temperature of pretreatment as 20-35 DEG C,
The voltage of color pretreatment is 8-10V, current density 0.1-0.5A/dm2, the time for colouring pretreatment is 0.5-2min.
3) anode oxidation membrane of aluminum alloy die casting is subjected to stabilization processes, processing method is by aluminum alloy die casting
It is placed in 80-90 DEG C of insulating box, time 6-12h, and aluminum alloy die casting cools down together with insulating box.
Step 4：Coloring, colours aluminum alloy die casting using illuminating colour, illuminating colour is to include：Acid red,
The aqueous solution of acid black and glacial acetic acid, wherein, the concentration of acid red is 4-12g/L, and the concentration of acid black is 0.2-2.5g/L, ice
The concentration of acetic acid is 0.1-5g/L.
Specifically, coloration temperature is 40-65 DEG C, coloration time 5-20min, and the aluminum alloy die casting after coloring is passed through
It washes and is dried.
Step 5：Seal treatment, the method for Seal treatment include：Aluminum alloy die casting is placed in lock solution, at closing
The temperature of reason is 80-85 DEG C, and the time of Seal treatment is 15-20min, and lock solution is to include：Nickel sulfate, cobaltous sulfate and acetic acid
The aqueous solution of sodium, wherein, the concentration of nickel sulfate is 4.2g/L, and the concentration of cobaltous sulfate is 0.7g/L, and the concentration of sodium acetate is 4.8g/
L, the pH value of lock solution is 4.5-5.5, will be dried by the aluminum alloy die casting of Seal treatment after washing.
Step 6：Polishing, the aluminum alloy die casting after coloring is mechanically polished, in the present embodiment, the sun after polishing
Pole oxide-film is separated with stripping method from die casting, and the thickness that film is measured microscopically with instrument is 16 μm.It is obtained with stripping method
Anode oxide film is taken, its density is obtained as 2.47 × 10 beneficial to density formula by weighing method3kg/m3, measured by hardometer aobvious
Microhardness is HV503.
By the aluminum alloy die casting after coloring when 48 is small after neutral salt spray test, the lustrous surface of aluminum alloy die casting
It is unchanged.
Meanwhile the aluminum alloy die casting sample after colored polish is subjected to acetes chinensis, the results show with spectrophotometer
Aberration △ E are respectively less than 1, this illustrates that the color of the aluminum alloy die casting sample does not have the phenomenon that aberration or layering.It in addition, will coloring
Aluminum alloy die casting sample after polishing carries out metallic reflection rate measurement with spectrophotometer, in visible-range, measures this
The metallic reflection rate of aluminum alloy die casting sample is more than 61%, it can be seen that, which has good anti-
Performance is penetrated, good reflecting properties are obtained by the metallic luster of the aluminum alloy die casting after coloring.Meanwhile multi-angle is seen
The aluminum alloy die casting after colored polish is examined, the aluminum alloy die casting color after the colored polish is full uniformly, and range estimation, which has no, appoints
What aberration or layering.
Aluminum alloy die casting brown colouration method provided in an embodiment of the present invention passes through two kinds of colors of acid red and acid black
Cooperation aluminum alloy die casting is dyed into brown, and the compacting aluminium alloy after dyeing has metallic luster, meanwhile, in the present embodiment
In the first step of the coloring pretreatment of offer, the content of free silica in anode oxide film can be reduced by the immersion of concentrated nitric acid,
Prevent free silicon from adsorbing in the hole of anode oxide film, so as to improve the porosity of anode oxide film, and concentrated nitric acid
It can react with silicon, generate the silica of water white transparency, so as to reduce being presented by free silica in anode oxide film
The grey gone out, so enhance coloring after aluminum alloy die casting surface metallic luster.In the second step of coloring pretreatment
The sulfate ion and nitrate ion in anode oxide film are eliminated using the principle of charge " homopolar-repulsion ", on the one hand, go
After sulfate radical ion and nitrate ion, the hole of anode oxide film is cleaned up so that coloring provided in an embodiment of the present invention
Dyestuff can enter in the hole of anode oxide film, so as to improve the ability of anode oxide film absorption acid dyes, improve
On the other hand tinctorial yield, removes the anode oxide film of sulfate ion and nitrate ion, and make anode oxide film absorption more
More aluminium ions, these aluminium ions will be preferentially adsorbed at alumina diaphragm defect.It is handled in the constant temperature of the 3rd step of coloring pretreatment,
It is that stabilization processes are carried out to anode oxidation membrane so that the aluminium ion adsorbed on anode oxide film is fully oxidized, Huo Zheyue
It adjourns inside anode oxide film, during compensating for preceding processes, the position of the aluminium ion missing in aluminium oxide lattice lattice point, from
And increase the volume of anode oxide film, and make anode oxide film finer and close, more secured, on the one hand, this causes the aluminium after coloring
Alloy pressuring casting can be processed by shot blasting anode oxide film, and anode oxide film is made to have better metallic luster, another
Aspect, fine and close anode oxide film can cause anode oxide film to have higher corrosion resistance.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of illuminating colour, which is characterized in that the illuminating colour is to include：Acid red, acid black and glacial acetic acid it is water-soluble
Liquid, wherein, the concentration of the acid red is 4-12g/L, and the concentration of the acid black is 0.2-2.5g/L, the glacial acetic acid it is dense
It spends for 0.1-5g/L.
A kind of 2. aluminum alloy die casting brown colouration method, which is characterized in that the described method includes：
Aluminum alloy die casting is coloured using illuminating colour, the illuminating colour is to include：Acid red, acid black and ice vinegar
The aqueous solution of acid, wherein, the concentration of the acid red is 4-12g/L, and the concentration of the acid black is 0.2-2.5g/L, the ice
The concentration of acetic acid is 0.1-5g/L.
3. according to the method described in claim 2, it is characterized in that, the coloration temperature is 40-65 DEG C, the coloration time is
5-20min。
4. according to the method described in claim 2, it is characterized in that, before the aluminum alloy die casting is coloured, will described in
Aluminum alloy die casting carries out coloring pretreatment, and the coloring pretreatment includes：
The aluminum alloy die casting is placed in concentrated nitric acid and impregnates 5-10s；
Using fine aluminium as anode, will cathode be used as by the aluminum alloy die casting after concentrated nitric acid immersion treatment, be placed in
In color pretreatment fluid, the reaction temperature that the coloring pre-processes is 20-35 DEG C, and the voltage of the coloring pretreatment is 5-10V, electric
Current density is 0.1-0.5A/dm2, the time of the coloring pretreatment is 0.5-2min；
The aluminum alloy die casting is heated into 6-12h at 80-90 DEG C.
5. according to the method described in claim 4, it is characterized in that, the coloring pretreatment fluid is to include aluminum sulfate and glacial acetic acid
Aqueous solution, the concentration of the aluminum sulfate is 0.5-2g/L, and the concentration of the glacial acetic acid is 1-3g/L.
6. according to the method described in claim 5, it is characterized in that, by the aluminum alloy die casting before the coloring pretreatment
Anodized is carried out, the method for the anodic oxidation includes：The aluminum alloy die casting is placed in concentration as 180-220g/
In the sulfuric acid solution of L, the temperature of the anodic oxidation is 5-20 DEG C, and the voltage of the anodic oxidation is 8-18V, the anodic oxygen
The current density of change is 0.8-1.5A/dm2。
7. according to the method described in claim 6, it is characterized in that, before the anodic oxidation to the aluminum alloy die casting into
Row surface preparation, the method for the surface preparation include：
Remove remaining greasy dirt on the aluminum alloy die casting；
The surface of the aluminum alloy die casting is polished；
Wash the aluminum alloy die casting；
The aluminum alloy die casting is placed in concentrated nitric acid and impregnates 5-10min, the aluminium of the surface covered with passivating film is obtained and closes
Golden die casting；
The anodic oxidation is used for after the aluminum alloy die casting is cleaned.
8. according to the method described in claim 2, it is characterized in that, by the aluminum alloy die casting after coloring by washing simultaneously
Seal treatment is carried out, the method for the Seal treatment includes：The aluminum alloy die casting is placed in lock solution, the closing
The temperature of processing is 80-85 DEG C, and the time of the Seal treatment is 15-20min.
9. according to the method described in claim 8, it is characterized in that, the lock solution is to include：Nickel sulfate, cobaltous sulfate and vinegar
The aqueous solution of sour sodium, wherein, the concentration of the nickel sulfate is 4.2g/L, and the concentration of the cobaltous sulfate is 0.7g/L, the acetic acid
The concentration of sodium is 4.8g/L, and the pH value of the lock solution is 4.5-5.5.
10. according to the method described in claim 8, it is characterized in that, by by Seal treatment the aluminum alloy die casting into
Row polishing treatment.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1712575A (en) * | 2005-05-12 | 2005-12-28 | 江汉大学 | Bronze coloring process of pack alloy |
| CN103334140A (en) * | 2013-06-19 | 2013-10-02 | 佛山耀银山铝业有限公司 | Anodic oxidation and normal-temperature golden dyeing technology for aluminum alloy |
| CN105506706A (en) * | 2016-01-04 | 2016-04-20 | 沈阳建筑大学 | Aluminum alloy anodizing coloring treatment method |
| CN106867275A (en) * | 2017-01-09 | 2017-06-20 | 广东长盈精密技术有限公司 | The preparation method of aluminium alloy dyeing black dyes, the colouring method of aluminium alloy |
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2017
- 2017-12-22 CN CN201711400348.XA patent/CN108103550A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1712575A (en) * | 2005-05-12 | 2005-12-28 | 江汉大学 | Bronze coloring process of pack alloy |
| CN103334140A (en) * | 2013-06-19 | 2013-10-02 | 佛山耀银山铝业有限公司 | Anodic oxidation and normal-temperature golden dyeing technology for aluminum alloy |
| CN105506706A (en) * | 2016-01-04 | 2016-04-20 | 沈阳建筑大学 | Aluminum alloy anodizing coloring treatment method |
| CN106867275A (en) * | 2017-01-09 | 2017-06-20 | 广东长盈精密技术有限公司 | The preparation method of aluminium alloy dyeing black dyes, the colouring method of aluminium alloy |
Non-Patent Citations (2)
| Title |
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| 沈品华: "《现代电镀手册（下册）》", 31 July 2011, 机械工业出版社 * |
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Application publication date: 20180601 |