CN108505096A - A kind of workpiece color method - Google Patents
A kind of workpiece color method Download PDFInfo
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- CN108505096A CN108505096A CN201810352730.6A CN201810352730A CN108505096A CN 108505096 A CN108505096 A CN 108505096A CN 201810352730 A CN201810352730 A CN 201810352730A CN 108505096 A CN108505096 A CN 108505096A
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- coloring
- current density
- workpiece
- coverage rate
- cell current
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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
-
- 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
-
- 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
Abstract
The present invention provides a kind of workpiece color methods, including following process：1) workpiece is pre-processed；2) anode oxidation coloration operation is cleaned and carries out, the coloring operation includes carrying out camera shooting analysis feedback control to workpiece surface；3) nickel-containing waste water is recycled using RO reverse osmosis technologies.Workpiece surface colour changing value in electroplating process is creatively utilized in it; and the current density of control plating is carried out according to the electroplating process that the degree of color change is reacted; to accurately control the coloring cell current density value or electrode voltage of important link during anode oxidation coloration; it is accurately controlled in this way; so that the entire production process time shortens; production product qualification rate can reach absolutely; and examination and test of products process can be saved, technique is finally also recycled nickel-containing waste water using RO reverse osmosis technologies very environmentally friendly.
Description
Technical field
The present invention relates to non-ferrous metals processing field, a kind of especially workpiece color method.
Background technology
Workpiece coloring is extremely important to the performance improvement of workpiece, at present the generally all main packet of the anode oxidation coloration of this field
The time segment included as corresponding coloring cell current density or electrode voltage is controlled, as patent 85100657,
2012102654769 equal disclosed technical solutions.But all there is a control not in time in the scheme, there are certain failures
Rate, and be unfavorable for lasting mass production, and product also needs to progress anodic oxidation and the problem of inefficiency
Color effect detection increases a large amount of cost.
Therefore inventor is made that the present invention, that is, provides a kind of workpiece method for anodizing and coloring of creativeness.
Invention content
Present invention generally provides a kind of workpiece color methods, which is characterized in that the method includes following processes：
1) workpiece is pre-processed；
2) anode oxidation coloration operation is cleaned and carries out, the coloring operation includes carrying out camera shooting analysis instead to workpiece surface
Feedback control；
3) nickel-containing waste water is recycled using RO reverse osmosis technologies.
Preferably, the workpiece is Al alloy parts, and the pretreatment includes sandblasting and sulfuric acid etch processing, the sandblasting
For the sand size used for 400 microns, wind pressure is 3 atmospheric pressure, and the sulfuric acid percent concentration is 1%, and temperature is 24 DEG C, etch
Time is 0.4 minute.
Preferably, the pH value for the colorant that the anode oxidation coloration operation uses is 7.5, and temperature is 60 degrees Celsius, institute
It is the solution for including following component to state colorant：
Nickel sulfate：0.1 gram per liter, boric acid：0.35 gram per liter, sodium citrate：0.5 gram per liter, sodium chloride：30 gram per liters.
Preferably, described that workpiece surface is carried out in camera shooting analysis feedback control procedure, using high speed camera to workpiece
Surface carries out real-time photography sampling, and is supplied to master controller to carry out image procossing the image that sampling obtains every 0.5s,
The master controller converts image that camera shooting sampling obtains to gray level image, and master controller is by each pixel
The gray level of point is compared with preset threshold value, and is more than the pixel mark 1 of the threshold value by gray scale, and gray scale is less than or equal to
The pixel mark 0 of the threshold value；To 1 all summations, summed result and total pixel value of the Al alloy parts are compared
Coverage rate is coloured compared with to obtain；The master controller adjusts coloring cell current density according to the coloring coverage rate in real time：When
When colouring coverage rate less than 5%, coloring cell current density is 1A/dm2；It is more than or equal to 5% in the presence of color coverage rate and is less than 10%
When, coloring cell current density is 3A/dm2；When being more than or equal to 10% in the presence of color coverage rate and being less than 20%, cell current density is coloured
For 5A/dm2；When being more than or equal to 20% in the presence of color coverage rate and being less than 60%, coloring cell current density is 6A/dm2；In the presence of wrapping
When lid rate is more than or equal to 60% and is less than 80%, coloring cell current density is 5A/dm2；It is more than or equal to 80% in the presence of color coverage rate
And when less than 85%, coloring cell current density is 2A/dm2；It is more than or equal to 85% in the presence of color coverage rate and stops the camera shooting sampling,
And it is 0.5A/dm that will colour cell current density constant2It is kept for 10 minutes.
The method of the present invention, is creatively utilized workpiece surface colour changing value in electroplating process, and become according to color
The electroplating process of the degree reaction of change carries out the current density of control plating, to accurately control anode oxidation coloration process
In important link --- the current density value in plating is accurately controlled in this way so that the entire production process time shortens, raw
Production product qualification rate can reach absolutely, and can save examination and test of products process.
Description of the drawings
The workpiece surface figure of sampling acquisition is carried out when Fig. 1-3 is in coloring process to different coloring degrees.
Specific implementation mode
Below with reference to drawings and examples, the present invention is described in further detail.
Embodiment one.
The present embodiment mainly provides a kind of workpiece color method, and the method includes following processes：
1) workpiece is pre-processed；
2) anode oxidation coloration operation is cleaned and carries out, the coloring operation includes carrying out camera shooting analysis instead to workpiece surface
Feedback control；
3) nickel-containing waste water is recycled using RO reverse osmosis technologies.
Preferably, the workpiece is Al alloy parts, and the pretreatment includes sandblasting and sulfuric acid etch processing, the sandblasting
For the sand size used for 400 microns, wind pressure is 3 atmospheric pressure, and the sulfuric acid percent concentration is 1%, and temperature is 24 DEG C, etch
Time is 0.4 minute.
Preferably, the pH value for the colorant that the anode oxidation coloration operation uses is 7.5, and temperature is 60 degrees Celsius, institute
It is the solution for including following component to state colorant：
Nickel sulfate：0.1 gram per liter, boric acid：0.35 gram per liter, sodium citrate：0.5 gram per liter, sodium chloride：30 gram per liters.
Preferably, described that workpiece surface is carried out in camera shooting analysis feedback control procedure, using high speed camera to workpiece
Surface carries out real-time photography sampling, and is supplied to master controller to carry out image procossing the image that sampling obtains every 0.5s,
The master controller converts image that camera shooting sampling obtains to gray level image, and master controller is by each pixel
The gray level of point is compared with preset threshold value, and is more than the pixel mark 1 of the threshold value by gray scale, and gray scale is less than or equal to
The pixel mark 0 of the threshold value；To 1 all summations, summed result and total pixel value of the Al alloy parts are compared
Coverage rate is coloured compared with to obtain；The master controller adjusts coloring cell current density according to the coloring coverage rate in real time：When
When colouring coverage rate less than 5%, coloring cell current density is 1A/dm2；It is more than or equal to 5% in the presence of color coverage rate and is less than 10%
When, coloring cell current density is 3A/dm2；When being more than or equal to 10% in the presence of color coverage rate and being less than 20%, cell current density is coloured
For 5A/dm2；When being more than or equal to 20% in the presence of color coverage rate and being less than 60%, coloring cell current density is 6A/dm2；In the presence of wrapping
When lid rate is more than or equal to 60% and is less than 80%, coloring cell current density is 5A/dm2；It is more than or equal to 80% in the presence of color coverage rate
And when less than 85%, coloring cell current density is 2A/dm2；It is more than or equal to 85% in the presence of color coverage rate and stops the camera shooting sampling,
And it is 0.5A/dm that will colour cell current density constant2It is kept for 10 minutes.
Workpiece surface colour changing value in electroplating process is creatively utilized in the method for the present embodiment, and according to color
The electroplating process of the degree reaction of variation carries out the current density of control plating, to accurately control anode oxidation coloration mistake
Important link in journey --- the current density value in plating is accurately controlled in this way so that and the entire production process time shortens,
Production product qualification rate can reach absolutely, and can save examination and test of products process.
Embodiment two.
Present invention generally provides a kind of workpiece color methods, which is characterized in that the method includes following processes：
1) Al alloy parts are pre-processed；
2) it cleans and carries out anode oxidation coloration operation；
It 2-2) cleans and carries out complement plated operation.
Wherein preferably, the pretreatment includes that sandblasting and sulfuric acid etch are handled, the sand size that the sandblasting uses for
400 microns, wind pressure is 3 atmospheric pressure, and the sulfuric acid percent concentration is 1%, and temperature is 24 DEG C, and the etch time is 0.4 minute.
Preferably, for the pH value for the plating solution that the complement plated operation uses for 5, temperature is 80 degrees Celsius, and the time is 1 hour, institute
Stating plating solution includes：
0.1 gram per liter nickel sulfate, 0.2 gram per liter sodium hypophosphite, 0.15 gram per liter sodium acetate, 30 gram per liter amino second
Acid.
Preferably, for the pH value for the plating solution that the anode oxidation coloration operation uses for 7.5, temperature is 60 degrees Celsius, described
Plating solution includes：
0.1 gram per liter nickel sulfate, 0.35 gram per liter boric acid, 0.5 gram per liter sodium citrate, 30 gram per liter sodium chloride.It is preferred that
In the anode oxidation coloration operation process, real-time photography sampling is carried out using high speed camera to workpiece surface for ground, and every
The image that sampling obtains is supplied to master controller to carry out image procossing by 0.5s, and the master controller obtains camera shooting sampling
Image be converted into gray level image, and master controller compares the gray level of each pixel with preset threshold value
Compared with this threshold value can carry out camera shooting conversion by being repeatedly electroplated to be obtained after i.e. plating obtains multiple finished products or semi-finished product
Then using average gray level as the threshold value, and it is more than the pixel mark 1 of the threshold value by gray scale, by gray scale for gray level image
Less than or equal to the pixel mark 0 of the threshold value；To 1 all summations, by total pixel of summed result and the Al alloy parts
Value is compared to obtain coloring coverage rate, i.e., the total value of all pixels point covered summed result divided by Al alloy parts
To obtain a percentage；The master controller adjusts coloring cell current density according to the coloring coverage rate in real time：In the presence of
When color coverage rate is less than 5%, coloring cell current density is 1A/dm2；When being more than or equal to 5% in the presence of color coverage rate and being less than 10%,
Coloring cell current density is 3A/dm2；When being more than or equal to 10% in the presence of color coverage rate and being less than 20% (such as Fig. 1), cell current is coloured
Density is 5A/dm2；When being more than or equal to 20% in the presence of color coverage rate and being less than 60%, coloring cell current density is 6A/dm2；In the presence of
When color coverage rate is more than or equal to 60% and is less than 80% (such as Fig. 2), coloring cell current density is 5A/dm2；It is big in the presence of color coverage rate
In equal to 80% and less than 85% when, coloring cell current density be 2A/dm2；It is more than or equal to 85% (such as Fig. 3) in the presence of color coverage rate
Stop the camera shooting sampling, and is that 0.5A/dm2 is kept for 10 minutes by coloring cell current density constant.
Embodiment three.
The present embodiment mainly provides the processing that a kind of workpiece color method is used for aluminium alloy, and the method includes following works
Sequence：
1) Al alloy parts are pre-processed comprising sandblasting and sulfuric acid etch processing, what the sandblasting used
Sand size is 300-500 microns, and wind pressure is 1-3 atmospheric pressure, and the sulfuric acid percent concentration is 1% or so, and temperature is room
Temperature, etch time are that can be adjusted depending on product situation within 1 minute.
2) it cleans and carries out anode oxidation coloration operation；The pH value for the plating solution that the anode oxidation coloration operation uses for
7.5, temperature is 60 degrees Celsius, and the plating solution is the solution for including following component：
Nickel sulfate：0.1 gram per liter, boric acid：0.35 gram per liter, sodium citrate：0.5 gram per liter, sodium chloride：30 gram per liters.
Preferably, in the anode oxidation coloration operation process, workpiece surface is taken the photograph in real time using high speed camera
It is supplied to master controller to carry out image procossing, the master controller image that sampling obtains as sampling, and every 0.5s
Convert the image that camera shooting sampling obtains to gray level image, and master controller is by the gray level of each pixel and in advance
If threshold value be compared, this threshold value can be obtained i.e. plating and obtain multiple finished products or semi-finished product by being repeatedly electroplated
After carry out camera shooting be converted into gray level image, then using average gray level as the threshold value, and by gray scale be more than the threshold value picture
Gray scale is less than or equal to the pixel mark 0 of the threshold value by vegetarian refreshments mark 1；To 1 all summations, summed result and the aluminium are closed
Total pixel value of metal working part is compared to obtain coloring coverage rate, i.e., covers summed result divided by Al alloy parts all
The total value of pixel is to obtain a percentage；The master controller adjusts coloring slot according to the coloring coverage rate in real time
Current density, this adjustment mode be be electroplated start when current density it is smaller, and current density during intermediate major part
It is larger, and restore smaller current density before end, and smaller current density is kept to be electroplated for a period of time to completion.Electricity
The size of current density can refer to the prior art and Binding experiment and be adjusted, such as the current density size that embodiment one provides,
But faster electroplating velocity or better electroplating effect can be obtained by increasing either reduction current density.
Finally, nickel-containing waste water is recycled using RO reverse osmosis technologies.
Example IV.
The present embodiment mainly provides a kind of workpiece color method, which is characterized in that the method includes following processes：
1) Al alloy parts are pre-processed comprising sandblasting and sulfuric acid etch processing, what the sandblasting used
Sand size is 300-500 microns, and wind pressure is 1-3 atmospheric pressure, and the sulfuric acid percent concentration is 1% or so, and temperature is room
Temperature, etch time are that can be adjusted depending on product situation within 1 minute.
2) it cleans and carries out anode oxidation coloration operation；The pH value for the plating solution that the anode oxidation coloration operation uses for
7.5, temperature is 60 degrees Celsius, and the plating solution is the solution for including following component：
Nickel sulfate：0.1 gram per liter, boric acid：0.35 gram per liter, sodium citrate：0.5 gram per liter, sodium chloride：30 gram per liters.
Preferably, in the anode oxidation coloration operation process, workpiece surface is taken the photograph in real time using high speed camera
It is supplied to master controller to carry out image procossing, the master controller image that sampling obtains as sampling, and every 0.5s
Convert the image that camera shooting sampling obtains to gray level image, and master controller is by the gray level of each pixel and in advance
If threshold value be compared, this threshold value can be obtained i.e. plating and obtain multiple finished products or semi-finished product by being repeatedly electroplated
After carry out camera shooting be converted into gray level image, then using average gray level as the threshold value, and by gray scale be more than the threshold value picture
Gray scale is less than or equal to the pixel mark 0 of the threshold value by vegetarian refreshments mark 1；To 1 all summations, summed result and the aluminium are closed
Total pixel value of metal working part is compared to obtain coloring coverage rate, i.e., covers summed result divided by Al alloy parts all
The total value of pixel is to obtain a percentage；The master controller adjusts coloring slot according to the coloring coverage rate in real time
Current density, this adjustment mode be be electroplated start when current density it is smaller, and current density during intermediate major part
It is larger, and restore smaller current density before end, and smaller current density is kept to be electroplated for a period of time to completion.Electricity
The size of current density can refer to the prior art and Binding experiment and be adjusted, such as the current density size that embodiment one provides,
But faster electroplating velocity or better electroplating effect can be obtained by increasing either reduction current density.
It 2-2) cleans and carries out complement plated operation.Preferably, for 5, temperature is the pH value for the plating solution that the complement plated operation uses
80 degrees Celsius, the time is 1 hour, and the plating solution is the solution for including following component：
Nickel sulfate：0.1 gram per liter, sodium hypophosphite：0.2 gram per liter, sodium acetate：0.15 gram per liter, amion acetic acid：30 grams
Every liter.
Embodiment five.
The present embodiment provides another Al alloy parts method for anodizing and coloring, and the method includes following processes：
1) Al alloy parts are pre-processed comprising sandblasting and sulfuric acid etch processing, what the sandblasting used
Sand size is 300-500 microns, and wind pressure is 1-3 atmospheric pressure, and the sulfuric acid percent concentration is 1% or so, and temperature is room
Temperature, etch time are that can be adjusted depending on product situation within 1 minute.
2) it cleans and carries out anode oxidation coloration operation；The pH value for the plating solution that the anode oxidation coloration operation uses for
7.5, temperature is 60 degrees Celsius, and the plating solution is the solution for including following component：
Nickel sulfate：0.1 gram per liter, boric acid：0.35 gram per liter, sodium citrate：0.5 gram per liter, sodium chloride：30 gram per liters.
Wherein preferably, in the anode oxidation coloration operation process, workpiece surface is carried out using high speed camera real
When camera shooting sampling, and be supplied to master controller to carry out image procossing, the center control image that sampling obtains every 0.5s
Device processed converts image that camera shooting sampling obtains to gray level image, and master controller is by the gray level of each pixel
It is compared with preset threshold value, this threshold value can be obtained the i.e. multiple finished products of plating acquisition or half by being repeatedly electroplated
Camera shooting is carried out after finished product and is converted into gray level image, then using average gray level as the threshold value, and is more than the threshold value by gray scale
Pixel mark 1, by gray scale be less than or equal to the threshold value pixel mark 0；To all 1 summations, by summed result with it is described
Total pixel value of Al alloy parts is compared to obtain coloring coverage rate, i.e., covers summed result divided by Al alloy parts
The total value of all pixels point is to obtain a percentage；The master controller adjusts sun in real time according to the coloring coverage rate
Pole tension, this adjustment mode are that when aoxidizing beginning, voltage is relatively low, and voltage is higher during intermediate major part, and is tying
Restore smaller voltage before beam, and smaller electrode voltage is kept extremely to complete plating for a period of time.The size of voltage can join
It examines the prior art and Binding experiment is adjusted, such as the voltage swing that embodiment one provides, but increasing or reduce voltage can be with
Faster electroplating velocity or better electroplating effect are obtained, and ceiling voltage should be controlled and be no more than breakdown voltage.
Claims (4)
1. a kind of workpiece color method, which is characterized in that the method includes following processes：
1) workpiece is pre-processed；
2) anode oxidation coloration operation is cleaned and carries out, the coloring operation includes carrying out camera shooting analysis feedback control to workpiece surface
System；
3) nickel-containing waste water is recycled using RO reverse osmosis technologies.
2. workpiece color method as described in claim 1, which is characterized in that the workpiece is Al alloy parts, the pre- place
Reason includes sandblasting and sulfuric acid etch processing, and for the sand size that the sandblasting uses for 400 microns, wind pressure is 3 atmospheric pressure, the sulphur
Sour percent concentration is 1%, and temperature is 24 DEG C, and the etch time is 0.4 minute.
3. workpiece color method as claimed in claim 2, which is characterized in that the coloring that the anode oxidation coloration operation uses
The pH value of agent is 7.5, and temperature is 60 degrees Celsius, and the colorant is the solution for including following component：
Nickel sulfate：0.1 gram per liter, boric acid：0.35 gram per liter, sodium citrate：0.5 gram per liter, sodium chloride：30 gram per liters.
4. the workpiece color method as described in one of claim 1-3, which is characterized in that described to carry out camera shooting analysis to workpiece surface
In feedback control procedure, real-time photography sampling is carried out to workpiece surface using high speed camera, and sampling is obtained every 0.5s
Image be supplied to master controller carry out image procossing, the master controller by camera shooting sampling obtain image be converted into ash
Image is spent, and the gray level of each pixel is compared by master controller with preset threshold value, and gray scale is surpassed
Gray scale is less than or equal to the pixel mark 0 of the threshold value by the pixel mark 1 for crossing the threshold value；To 1 all summations, will sum
As a result it is compared with total pixel value of the Al alloy parts to obtain coloring coverage rate；The master controller is according to
Coloring coverage rate adjusts coloring cell current density in real time：When being less than 5% in the presence of color coverage rate, coloring cell current density is 1A/
dm2；When being more than or equal to 5% in the presence of color coverage rate and being less than 10%, coloring cell current density is 3A/dm2；It is big in the presence of color coverage rate
In equal to 10% and less than 20% when, coloring cell current density be 5A/dm2；It is more than or equal to 20% in the presence of color coverage rate and is less than
When 60%, coloring cell current density is 6A/dm2；When being more than or equal to 60% in the presence of color coverage rate and being less than 80%, cell current is coloured
Density is 5A/dm2；When being more than or equal to 80% in the presence of color coverage rate and being less than 85%, coloring cell current density is 2A/dm2；In the presence of
Color coverage rate is more than or equal to 85% and stops the camera shooting sampling, and is 0.5A/dm by coloring cell current density constant2Kept for 10 points
Clock.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113322470A (en) * | 2021-06-07 | 2021-08-31 | 湖北欣洁顺幕墙材料有限公司 | Surface treatment process and processing method of aluminum veneer for curtain wall |
| CN115976587A (en) * | 2023-02-21 | 2023-04-18 | 中国地质大学（北京） | Production process and system for electrolytically coloring surface oxide layer with low reflectivity |
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| CN107313097A (en) * | 2016-04-26 | 2017-11-03 | 昆山汉鼎精密金属有限公司 | Die-cast aluminum alloy workpiece method for coloring surface and products thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113322470A (en) * | 2021-06-07 | 2021-08-31 | 湖北欣洁顺幕墙材料有限公司 | Surface treatment process and processing method of aluminum veneer for curtain wall |
| CN115976587A (en) * | 2023-02-21 | 2023-04-18 | 中国地质大学（北京） | Production process and system for electrolytically coloring surface oxide layer with low reflectivity |
| CN115976587B (en) * | 2023-02-21 | 2023-08-22 | 中国地质大学（北京） | Production process and system for electrolytic coloring surface oxide layer low reflectivity |
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Application publication date: 20180907 |