CN107829126A - A kind of aluminium alloy electrolytic colouring technology - Google Patents
A kind of aluminium alloy electrolytic colouring technology Download PDFInfo
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- CN107829126A CN107829126A CN201711271178.XA CN201711271178A CN107829126A CN 107829126 A CN107829126 A CN 107829126A CN 201711271178 A CN201711271178 A CN 201711271178A CN 107829126 A CN107829126 A CN 107829126A
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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
- C25D11/10—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic 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
- C25D11/06—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
- C25D11/12—Anodising more than once, e.g. in different baths
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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
- C25D11/16—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
- C25D11/04—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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Abstract
The invention discloses a kind of aluminium alloy electrolytic colouring technology, including：01, pre-treatment：Electrolysis, activation is carried out after aluminum alloy material surface is cleaned up in activating solution；S02, once electrolytic coloring：DC electrolysis coloring is carried out in once electrolytic coloring liquid to aluminium alloy；S03, re-electrolysis coloring：Ac electrolytic coloring is carried out in re-electrolysis coloring liquid to the aluminium alloy for completing S02 steps；S04, sealing of hole：Aluminum alloy surface after above-mentioned electrolytic coloring is sprayed the clean rear pore-sealing liquid that immerses and carries out sealing of hole.The technical process of alloy colouring technology utilization provided by the invention electrolytic coloring twice, make dyed layer evenly, stably, hardness it is higher, and the black colorant layer of good texture is finally presented in alloy colouring layer, is suitable for the preparation process of high-end aluminum alloy appearance part.Meanwhile it also proposed a kind of method for sealing suitable for above-mentioned coloring process in the present invention.
Description
Technical field
The invention belongs to aluminum alloy surface processing technique field, and in particular to a kind of aluminium alloy electrolytic colouring technology.
Background technology
Aluminium alloy density is low, intensity is than high.It is one of most widely used non-ferrous metal structural material in industry, has excellent
Good electric conductivity, thermal conductivity and corrosion stability.Simultaneously as aluminium alloy density is low, cheap, small toxicity, moulding process are ripe,
Compared to stainless steel and titanium alloy is played, there is boundless development space in fields such as medicine equipment, food, household appliances.
Aluminium alloy anode oxide electrolytic coloring is one of most commonly used processing method of applicability in aluminum alloy surface processing.
Fine and close, abundant oxidation film layer is formed in aluminum alloy surface using the method for anodic oxidation, so as to significantly improve the resistance to of aluminium alloy
Corrosion, lift its hardness, wearability and decoration performance.Aluminium alloy electrocolor process is that oxidation is first generated in general electrolyte
Film, be then electrolysed again in metallic salt electrolyte, make the cationic deposition of metal salt in oxide-film vacuum bottom and
Coloring, aluminium alloy electrocolor process liquid are referred to as re-electrolysis colouring.Re-electrolysis colouring is according to power supply type classification point
For direct current method and alternating current method, classify according to electrolytic colouring liquid, single salt, various metals composite salt and double staining can be divided into
Liquid method.
The essence of aluminium alloy electrolytic coloring is similar to plating, is all that the metal ion in metal salt solution is sunk by being electrolysed
When being mapped on such metallic diffusing scattering occurs for the long-pending vacuum stage in anode oxide film, light, so that oxide-film is presented
Color.Electrolytic coloring reaction belongs to by metal（Aluminium base）- semiconductor（Oxide-film barrier layer）The electrochemistry that-electrolyte is formed is anti-
Should, it is an extremely complex electrochemical reaction process.Method of the prior art is needed after preceding processing, by aluminium alloy
After common sulphuric acid anodizing, then in the electrolytic coloring groove containing metal salt coloured oxide-film.For example, Application No.
201010190868.4 Chinese invention patent " a kind of preparation method of aluminum alloy colored composite film " in propose a kind of aluminium
The preparation method of alloy colored composite film, this method includes pre-treatment and the DC electrolysis to aluminium alloy colour, DC electrolysis
Coloring is using by H2SO4、CuSO4, EDTA and water composition composite electrolyte, wherein H2SO4For 1000-1200g/L, CuSO4
For 200-300g/L, EDTA 40-55g/L, surplus is water；0.5=0.6A/cm is kept at a temperature of 20-30 DEG C2 Constant current
Density is coloured, and the ratio between negative electrode and annode area are（1.5-2）：1.This method preparation process is simple, production operation safety, raw
Production cost is low, and obtained coloring film not only possesses good corrosion resistance, and meets cosmetic requirement.
Although the aluminium alloy electrolysis coloring processes in the above method have the advantages of safety, cost is low, actually should
Easily appearance coloring is uneven during, and easily the problem of aberration occurs in the color with setting.
The content of the invention
In order to solve the deficiencies in the prior art, the invention provides a kind of aluminium alloy electric that can be uniformly coloured
Solve coloring process, the coloring process using electrolytic coloring twice technical process, make dyed layer evenly, stably, hardness it is higher,
And the black colorant layer of good texture is finally presented in alloy colouring layer, it is suitable for the preparation process of high-end aluminum alloy appearance part.
Meanwhile it also proposed a kind of method for sealing suitable for above-mentioned coloring process in the present invention.
The technique effect of the invention to be reached is realized by following scheme：
The aluminium alloy electrolysis coloring processes provided in the present invention, comprise the following steps：
S01, pre-treatment：Electrolysis, activation is carried out after aluminum alloy material surface is cleaned up in activating solution, the activating solution
Constituent content is concentrated sulfuric acid 2-5g/L, phosphatase 24 0-55g/L, chromic acid 0.2-0.3g/L, and surplus is water；Activation temperature is 65-70
DEG C, electrolysis time 15-30s, current density is 0.1-0.15 A/dm2；
S02, once electrolytic coloring：DC electrolysis coloring, the once electrolytic are carried out in once electrolytic coloring liquid to aluminium alloy
Coloring liquid constituent content is boric acid 28-32g/L, seven water nickel sulfate 35-50 g/L, cobaltous sulfate 25-30 g/L, sulfosalicylic acid 5-
8 g/L, the cobaltammine 2-3g/L of sulfuric acid nitrite anions five, arabic acid 5-7 g/L, EDTA3-5 g/L, surplus is water；Utilize
0.1-0.5wt% dilute sulfuric acids and ammoniacal liquor adjust pH value in the range of 4.0-4.5, and coloration temperature is 20-25 DEG C, the constant current of coloring
Density is 0.6-0.8A/dm2, a length of 1-3min during coloring, using graphite electrode；
S03, re-electrolysis coloring：Alternating current electrolysis is carried out in re-electrolysis coloring liquid to the aluminium alloy for completing S02 steps
Color, the re-electrolysis coloring liquid constituent content be cobaltous sulfate 12-18 g/L, ammonium sulfate 8-10 g/L, boric acid 12-18 g/L,
Concentrated sulfuric acid 25-30 g/L, aluminum sulfate 8-10 g/L, the ammoniacal liquor of sulfuric acid five close cobalt 3-5 g/L, arabic acid 5-7 g/L, EDTA3-5
G/L, surplus are water；PH value is adjusted in the range of 4.2-4.5 using 0.1-0.5wt% dilute sulfuric acids and ammoniacal liquor, coloration temperature 20-
25 DEG C, the current density of coloring is 0.3-0.6A/dm2, a length of 8-13min during coloring, using aluminium electrode；
S04, sealing of hole：Aluminum alloy surface after above-mentioned electrolytic coloring is sprayed the clean rear pore-sealing liquid that immerses and carries out sealing of hole, institute
The constituent content for stating pore-sealing liquid is nickel acetate 6-6.2g/L, cobalt acetate 1.2-1.3 g/L, boric acid 9.1-9.2 g/L, sodium carbonate
5.2-5.4 g/L, sodium metasilicate 7-7.5 g/L, surplus is water, and the pore-sealing liquid is adjusted using 0.1-0.5wt% dilute sulfuric acids and ammoniacal liquor
For pH value in the range of 5.5-5.8, sealing of hole temperature is 70-75 DEG C, a length of 15-20min during sealing of hole.
The main component of oxide-film is aluminum oxide, and pure aluminum oxide is nonconducting insulator, but made of reality
Oxide-film and impure aluminum oxide, but close to a kind of material of insulator, more similar to the state of semiconductor.In order that
Electrolytic coloring process is more uniform, even if metal ion carries out electrolysis precipitation in fenestra is aoxidized, electronics must be to barrier layer table
Move in face.In addition to special coloring liquid, metal is the reason for oxide-film deposits coloring in the air using " gold colloid particle
Light reflects " illustrate.Most metallic plates have argenteous metallic luster, but if the metal are milled into fine-powder
Grain, then become black, as white in the glass plate of water white transparency is milled into fine-powder.As can be seen here, the color of object because
Whether its species, state are colloidal particle and variant.
The principle of above-mentioned electrolytic coloring is understood, surface has been generated to the aluminum alloy materials of oxide-film first in the present invention
Surface clean is clean, then its surface is formed activation point using electrolysis, activation, so that follow-up electrolytic coloring process can be rapid
Carry out.The electrolysis of short time, low current density in the present invention in mix acid liquor are activated, and on the one hand enable aluminum alloy to surface
Oxide-film more even uniform, on the other hand activates surface film oxide, due to processing time is short, to oxide-film almost without any
Substantial influence.
Using electrocolor process twice in the present invention, matched somebody with somebody in once electrolytic coloring using nickel sulfate and the double salt of cobaltous sulfate
Fang Jinhang electrolytic colorings, coordinate weak acid and the cobaltammine of sulfuric acid nitrite anions five to form specific pH environment, while provide electrolysis
Ion buffer environment in coloring process, the speed of control electrolytic coloring process intermediate ion attachment, on Process on Aluminum Alloy Oxidation Film surface
Form the colored film of one layer of inclined coppery of light cyan.Using cobaltous sulfate and the double salt formulas of aluminum sulfate in re-electrolysis coloring, one
Adhere to one layer of more firm, tough and tensile dyed layer on secondary electrolytic coloring layer, the dyed layer color is black.Once electrolytic coloring liquid
Coordinate with the arabic acid in re-electrolysis coloring liquid and EDTA as stabilizer and used, on the one hand in stable coloring process
The severe degree of surface reaction, on the other hand it can slow down as electrolytic coloring process occurs, reactive ion concentration in coloring liquid
Reactions change caused by change.The ammonia of sulfuric acid five in the cobaltammine of sulfuric acid nitrite anions five and re-electrolysis liquid in once electrolytic liquid
Hydration cobalt is used to balance during electrolytic coloring the ion concentration balance in coloring liquid.
When carrying out re-electrolysis coloring, caused oxidation film layer is by secondary mass-tone liquid in once electrolytic coloring process
Sour environment is transformed into ac oxide film, and the structure on its barrier layer will not change, macroscopic view apparently, aluminum alloy surface dyed layer
More uniformly, coloring is deeply without " loose colour ".
The selection of electrode material is most important in electrolytic colouring technology, and once electrolytic is coloured in the present invention and re-electrolysis
Graphite electrode and aluminium electrode is respectively adopted in color, can not use other electrodes.
The hole-sealing technology after electrolytic colouring technology in the present invention should not use traditional hydration hole-sealing technology（Boiling water sealing hole
With steam sealing of hole）, can be bad to manufactured coloured oxide-film surface formation current mark shape, provide a kind of applicable gold in the present invention
Belong to salting liquid hole-sealing technology, improved sealing of hole effect.
Further, during S01 electrolysis, activations, aluminum alloy materials are hung on hanger, and the hanger is in polishing fluid
Uniform rotation, velocity of rotation 10-30r/min.
Further, S01 electrolysis, activation process is carried out under ultrasound environments, supersonic frequency 80-120KHz.
During electrolysis, activation, due to as electrolyte, certain corrosiveness can be produced to aluminium using Acidic Liquid, when
When voltage rises, the minute bubbles of insulating properties are gathered on anode, quickly form one layer of closely adhesion layer.At this moment, electric current passes through exhausted
If the position of edge is electrolysed, place more than the bubble is difficult to, by the way that electrolysis, activation seldom occurs, to cause due to electric current
Oxidized aluminum alloy layer forms uneven, therefore needs to exclude bubble using the rotation of hanger or ultrasonic technique, while also can
Reaction speed is controlled, acid solution is minimized to the erosion degree of aluminum alloy surface, is smoothed out electrolysis, activation process.
Further, 0.2-0.3g/L silver nitrate is added in the once electrolytic coloring liquid.
Further, 5-10g/L accelerator GKC is added in the once electrolytic coloring liquid.
Further, 8-12g/L sodium selenite is added in the re-electrolysis coloring liquid.
Further, 5-6g/L citric acid is added in the re-electrolysis coloring liquid.
Further, 0.2-0.3g/L silver nitrate is added in the re-electrolysis coloring liquid.
Further, the once electrolytic coloring is bar-shaped electricity with the electrode shape used in re-electrolysis coloring process
Pole.
Further, the once electrolytic coloring is tubulose electricity with the electrode shape used in re-electrolysis coloring process
Pole.
The present invention has advantages below：
In order to solve the deficiencies in the prior art, the invention provides a kind of aluminium alloy that can be uniformly coloured to be electrolysed
Color technique, the coloring process using electrolytic coloring twice technical process, make dyed layer evenly, stably, hardness it is higher, and aluminium
The black colorant layer of good texture is finally presented in alloy dyed layer, is suitable for the preparation process of high-end aluminum alloy appearance part.Meanwhile
A kind of method for sealing suitable for above-mentioned coloring process is also proposed in the present invention.
Embodiment
With reference to embodiment, the present invention will be described in detail.
6063 wrought aluminium alloys are struck out into 10 × 15cm mobile phone shells in the embodiment of the present invention, and utilize sulphuric acid anodizing
Thickness is made on its surface and is 25-30 μm of anode oxide film for technique, and there is the aluminum alloy sample of anode oxide film to enter this
Row electrolytic coloring.
Embodiment 1
The processing of following steps is carried out to above-mentioned 1000PCS aluminium alloy mobile phone shell sample：
S01, pre-treatment：
Carry out electrolysis, activation after specimen surface is cleaned up in activating solution, the constituent content of activating solution is concentrated sulfuric acid 4g/L,
Phosphoric acid 55g/L, chromic acid 0.20g/L activation temperatures are 70 DEG C, electrolysis time 15s, current density 0.15A/dm2.Electrolysis is lived
During change, aluminum alloy specimen is hung on hanger, hanger uniform rotation in polishing fluid, velocity of rotation 30r/min.
Deionized water rinsing is utilized after activation 3-5 times.
S02, once electrolytic coloring：
DC electrolysis coloring is carried out in once electrolytic coloring liquid to sample, once electrolytic coloring liquid constituent content is boric acid 30g/
L, the g/L of seven water nickel sulfate 40, cobaltous sulfate 30g/L, the g/L of sulfosalicylic acid 8, the cobaltammine 3.0g/L of sulfuric acid nitrite anions five, Ah
Draw primary acid 5 g/L, EDTA4g/L.It is 4.3 using 0.1wt% dilute sulfuric acids and ammoniacal liquor regulation pH value, coloration temperature is 25 DEG C, coloring
Constant current density be 0.8A/dm2, a length of 1min during coloring, using bar-shaped graphite electrode.Once electrolytic utilizes after colouring
Deionized water rinsing, remove surface loose colour residual.
S03, re-electrolysis coloring：
Ac electrolytic coloring, re-electrolysis coloring liquid group are carried out in re-electrolysis coloring liquid to the sample for completing S02 steps
It is the g/L of cobaltous sulfate 16, the g/L of ammonium sulfate 9, boric acid 15g/L, the g/L of the concentrated sulfuric acid 25, aluminum sulfate 8.0g/L, the ammonia of sulfuric acid five to divide content
The g/L of cobalt 3.4, arabic acid 7g/L, EDTA5 g/L are hydrated, is 4.4 using 0.1wt% dilute sulfuric acids and ammoniacal liquor regulation pH value, coloring
Temperature is 25 DEG C, and the current density of coloring is 0.5A/dm2, a length of 12min during coloring, using bar-shaped aluminium electrode.
In processing procedure, it is in canescence that pre-treatment, which terminates rear aluminum alloy sample surface, is presented after the completion of once electrolytic coloring
The inclined coppery of light cyan, surface slightly have inequality, and homogeneous black surface is presented after the completion of re-electrolysis coloring, and re-electrolysis coloring finishes
Deionized water rinsing is utilized afterwards, removes surface loose colour residual.
S04, sealing of hole：
Aluminum alloy surface after above-mentioned electrolytic coloring is sprayed the clean rear pore-sealing liquid that immerses and carries out sealing of hole, the pore-sealing liquid
Constituent content is nickel acetate 6.15g/L, the g/L of cobalt acetate 1.26, the g/L of boric acid 9.14, the g/L of sodium carbonate 5.23, sodium metasilicate 7.0
G/L, surplus are water, and pore-sealing liquid is 5.6 using 0.1wt% dilute sulfuric acids and ammoniacal liquor regulation pH value, and sealing of hole temperature is 72 DEG C, during sealing of hole
A length of 18min.
The total yield of process section is 99.1%.
Embodiment 2
The present embodiment terms and conditions is same as Example 1, is carried out in pretreatment process under ultrasound environments, and supersonic frequency is
100KHz.Yield 99.0%.
Embodiment 3
The present embodiment terms and conditions is same as Example 1, and 0.25g/L silver nitrate is added in once electrolytic coloring liquid.It is once electric
After solution coloring, aluminum alloy surface has fairy green gloss, and after re-electrolysis coloring, light gold is presented in aluminium alloy black surface
Gloss.
Yield is same as Example 1.
Embodiment 4
The present embodiment terms and conditions is same as Example 1, and 6g/L accelerator GKC is added in once electrolytic coloring liquid, once electric
The process of solution coloring is speeded, and surface is more uniform than embodiment 1.
Yield is same as Example 1.
Embodiment 5
The present embodiment terms and conditions is same as Example 1, and 10g/L sodium selenite is added in re-electrolysis coloring liquid.Secondary electricity
Thick 3-5 μm in caused black film thickness ratio embodiment 1 after the completion of solution coloring, outward appearance is more hard abundant.
Yield is same as Example 1.
Embodiment 6
The present embodiment terms and conditions is same as Example 1, and 5.1g/L citric acid is added in re-electrolysis coloring liquid.Re-electrolysis
Liquid is more stable, and it is lifted 2-3 times using cycle period.
Yield is same as Example 2.
Embodiment 7
The present embodiment terms and conditions is same as Example 1, and 0.3g/L silver nitrate is added in re-electrolysis coloring liquid.Re-electrolysis
After coloring, fairy green gloss is presented in aluminium alloy black surface, with more metal-like.
Yield is same as Example 2.
Embodiment 8
The present embodiment terms and conditions is same as Example 1, the electrode used in once electrolytic coloring and re-electrolysis coloring process
Shape is tubulose.
Yield is same as Example 2.
Embodiment 1 makes electric current distribution uniform with the electrode shape in embodiment 8, preferably edge can be avoided to imitate
Should.
It can be seen that by above-described embodiment, the invention provides a kind of aluminium alloy electrolytic colouring that can be uniformly coloured
Skill, the coloring process using electrolytic coloring twice technical process, make dyed layer evenly, stably, hardness it is higher, and aluminium alloy
The black colorant layer of good texture is finally presented in dyed layer, is suitable for the preparation process of high-end aluminum alloy appearance part.Meanwhile this hair
A kind of method for sealing suitable for above-mentioned coloring process is also proposed in bright.
It is last it should be noted that above example is only illustrating the technical scheme of the embodiment of the present invention rather than it is entered
Row limitation, although the embodiment of the present invention is described in detail with reference to preferred embodiment, one of ordinary skill in the art
It should be understood that can still be modified to the technical scheme of the embodiment of the present invention or equivalent substitution, and these modifications or wait
The scope of amended technical scheme disengaging technical scheme of the embodiment of the present invention can not also be made with replacement.
Claims (10)
1. a kind of aluminium alloy electrolytic colouring technology, it is characterised in that comprise the following steps：
S01, pre-treatment：Electrolysis, activation is carried out after aluminum alloy material surface is cleaned up in activating solution, the activating solution
Constituent content is concentrated sulfuric acid 2-5g/L, phosphatase 24 0-55g/L, chromic acid 0.2-0.3g/L, and surplus is water；Activation temperature is 65-70
DEG C, electrolysis time 15-30s, current density is 0.1-0.15 A/dm2；
S02, once electrolytic coloring：DC electrolysis coloring, the once electrolytic are carried out in once electrolytic coloring liquid to aluminium alloy
Coloring liquid constituent content is boric acid 28-32g/L, seven water nickel sulfate 35-50 g/L, cobaltous sulfate 25-30 g/L, sulfosalicylic acid 5-
8 g/L, the cobaltammine 2-3g/L of sulfuric acid nitrite anions five, arabic acid 5-7 g/L, EDTA3-5 g/L, surplus is water；Utilize
0.1-0.5wt% dilute sulfuric acids and ammoniacal liquor adjust pH value in the range of 4.0-4.5, and coloration temperature is 20-25 DEG C, the constant current of coloring
Density is 0.6-0.8A/dm2, a length of 1-3min during coloring, using graphite electrode；
S03, re-electrolysis coloring：Alternating current electrolysis is carried out in re-electrolysis coloring liquid to the aluminium alloy for completing S02 steps
Color, the re-electrolysis coloring liquid constituent content be cobaltous sulfate 12-18 g/L, ammonium sulfate 8-10 g/L, boric acid 12-18 g/L,
Concentrated sulfuric acid 25-30 g/L, aluminum sulfate 8-10 g/L, the ammoniacal liquor of sulfuric acid five close cobalt 3-5 g/L, arabic acid 5-7 g/L, EDTA3-5
G/L, surplus are water；PH value is adjusted in the range of 4.2-4.5 using 0.1-0.5wt% dilute sulfuric acids and ammoniacal liquor, coloration temperature 20-
25 DEG C, the current density of coloring is 0.3-0.6A/dm2, a length of 8-13min during coloring, using aluminium electrode；
S04, sealing of hole：Aluminum alloy surface after above-mentioned electrolytic coloring is sprayed the clean rear pore-sealing liquid that immerses and carries out sealing of hole, institute
The constituent content for stating pore-sealing liquid is nickel acetate 6-6.2g/L, cobalt acetate 1.2-1.3 g/L, boric acid 9.1-9.2 g/L, sodium carbonate
5.2-5.4 g/L, sodium metasilicate 7-7.5 g/L, surplus is water, and the pore-sealing liquid is adjusted using 0.1-0.5wt% dilute sulfuric acids and ammoniacal liquor
For pH value in the range of 5.5-5.8, sealing of hole temperature is 70-75 DEG C, a length of 15-20min during sealing of hole.
2. aluminium alloy electrolysis coloring processes as claimed in claim 1, it is characterised in that：During S01 electrolysis, activations, aluminium alloy material
Material is hung on hanger, hanger uniform rotation in polishing fluid, velocity of rotation 10-30r/min.
3. aluminium alloy electrolysis coloring processes as claimed in claim 1, it is characterised in that：S01 electrolysis, activation process is in ultrasonic ring
Carried out under border, supersonic frequency 80-120KHz.
4. aluminium alloy electrolysis coloring processes as claimed in claim 1, it is characterised in that：Added in the once electrolytic coloring liquid
0.2-0.3g/L silver nitrate.
5. aluminium alloy electrolysis coloring processes as claimed in claim 1, it is characterised in that：5- is added in the once electrolytic coloring liquid
10g/L accelerator GKC.
6. aluminium alloy electrolysis coloring processes as claimed in claim 1, it is characterised in that：8- is added in the re-electrolysis coloring liquid
12g/L sodium selenite.
7. aluminium alloy electrolysis coloring processes as claimed in claim 1, it is characterised in that：5- is added in the re-electrolysis coloring liquid
6g/L citric acid.
8. aluminium alloy electrolysis coloring processes as claimed in claim 1, it is characterised in that：Added in the re-electrolysis coloring liquid
0.2-0.3g/L silver nitrate.
9. aluminium alloy electrolysis coloring processes as claimed in claim 1, it is characterised in that：The once electrolytic coloring and re-electrolysis
The electrode shape used in coloring process is stick electrode.
10. aluminium alloy electrolysis coloring processes as claimed in claim 1, it is characterised in that：The once electrolytic coloring and secondary electricity
The electrode shape used in solution coloring process is hollow edged electrode.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109183120A (en) * | 2018-09-30 | 2019-01-11 | 佛山市海化表面处理科技有限公司 | A kind of oxidation aluminium film titanium color electrolytic coloring production technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109183120A (en) * | 2018-09-30 | 2019-01-11 | 佛山市海化表面处理科技有限公司 | A kind of oxidation aluminium film titanium color electrolytic coloring production technology |
| CN113638025A (en) * | 2021-07-15 | 2021-11-12 | 惠州市安泰普表面处理科技有限公司 | Method suitable for coloring surface of aluminum alloy |
| CN115074800A (en) * | 2022-06-28 | 2022-09-20 | 重庆长安汽车股份有限公司 | Aluminum alloy automobile body coating method |
| CN115449878A (en) * | 2022-08-24 | 2022-12-09 | 四会市建鑫装饰材料有限公司 | Black coloring process for aluminum profile |
| CN115449878B (en) * | 2022-08-24 | 2023-08-11 | 四会市建鑫装饰材料有限公司 | Black coloring process for aluminum profile |
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