CN101831685A - Electrophoretic coating method for surface of magnesium alloy part - Google Patents
Electrophoretic coating method for surface of magnesium alloy part Download PDFInfo
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- CN101831685A CN101831685A CN 201010185992 CN201010185992A CN101831685A CN 101831685 A CN101831685 A CN 101831685A CN 201010185992 CN201010185992 CN 201010185992 CN 201010185992 A CN201010185992 A CN 201010185992A CN 101831685 A CN101831685 A CN 101831685A
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- magnesium alloy
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Abstract
The invention discloses an electrophoretic coating method for a surface of a magnesium alloy part. The method is characterized in that the surface treatment is micro-arc oxidation ceramic layer treatment and the electrophoretic coating is forming an electrophoretic paint layer on the surface of the ceramic layer. The method has the characteristics of good processing property, adaptability to industrialized production, low process cost, high production efficiency, good quality of finished products and the like.
Description
Technical field
The present invention relates to a kind of method of magnesium alloy part surface electrical electrophoresis painting dressing, belong to the metal material surface treatment technology.
Background technology
Magnesium alloy has advantages such as low density, height ratio mould, high specific strength, high damping, electromagnetic shielding, is worth and wide application prospect and have important use in fields such as automobile, electronics, aviation, national defence.But, and magnesium alloy is carried out surface treatment methods such as chemical conversion film, sol-gel technique, electrophoretic painting, the etching problem of avoiding magnesium alloy in use to run into because magnesium alloy itself is perishable.
Organic coating is the most effective a kind of erosion shield.The method of organic coating is more, as sol-gel technique, spraying, brush, electrophoretic painting etc., wherein, sol-gel technique and spraying, the brushing technology exists complicated product internal layer, depression, weld seams etc. locate to be difficult to cover the problem of organic coating, and electrophoretic painting has not only solved this difficult problem, and the electrophoretic paint utilization ratio is up to 90%～95%, and good decorating effect, face is smooth, exquisite, is rich in metalluster, satisfying the excellent performance (lightweight of modern society's pursuit product itself, electromagnetic shielding etc.) outside, improved its added value (ornamental).The conventional electrophoretic application only limits to application on metals such as iron plate, stainless steel at present.In recent years, because product lightweight development trends such as 3C, electrophoretic painting more and more was applied on the Mg alloy surface.Yet the pH value of cathode electrodip painting is mostly in 5.5～6.5 scopes, negative electrode H+ increases during electrophoretic painting, the magnesium alloy during perishable negative electrode application, and the most casting techniques that adopt of magnesium alloy, there are defectives such as hole, crackle in the surface, has added a difficult problem for the magnesium alloy electrophoretic painting.
Document (Zinc phosphating of Mg alloy surface and ability cathode electrophoresis connect and build the journal Vol.28No.1 Jan.2007 of Jiangsu University) has been introduced a kind of magnesium alloy cathode electrophoretic coating process, is to add Ce (NO earlier
3)
3Phosphatization liquid in preparation one deck phosphatize phosphate coat, cathode electro-coating on phosphatize phosphate coat again.Patent CN200710097634.3 adopts anode oxidation method to carry out pre-treatment before magnesium alloy cathode electrophoretic.As everyone knows, phosphatization liquid and anodic oxidation electrolyte (electrolytic solution such as sulfuric acid, oxalic acid) are to pollute more serious corrosive fluid, and human body and environment are all had serious harm.Patent CN200610104404.0 then is by constantly adjusting frequency back and forth and the control of parameter such as duty arc differential oxide ceramic layer, electrophoretic painting on described arc differential oxide ceramic layer then; And patent CN200710131372.8 be by modes such as vacuum splashing and plating lining, electroless plating or plating to conducting electricity pre-treatment on the arc differential oxide ceramic layer, plate metals such as one deck nickel, silver.Because the method or the expensive or contaminate environment of metal plating layer, and can not match with electrophoretic painting efficient advantages of higher.Above-mentioned two kinds of patents are complex process not only, and volume production may be minimum.
Summary of the invention
The objective of the invention is to overcome magnesium alloy and be difficult to application, problems such as ornamental and existing pretreatment technology contaminate environment, complex process, and provide a kind of and can obtain sticking power on magnesium alloy part surface, solidity to corrosion is good, can be fit to the method for magnesium alloy part surface electrical electrophoresis painting dressing of the ability cathode electrophoresis organic coating of suitability for industrialized production.
Magnesium alloy part method for coating surface provided by the present invention, be included in the specified proportion silicate electrolytic solution by the control micro-arc oxidation process, it is better to form one deck electroconductibility at Mg alloy surface earlier, wettability is arc differential oxide ceramic layer preferably, and then is coated with on described arc differential oxide ceramic layer and loads onto the cathode electrodip painting layer by the control electrophoresis coating technique.
The present invention replaces technologies such as bonderizing and anodic oxidation by the differential arc oxidation pre-treating technology, can obtain sticking power, solidity to corrosion ability cathode electrophoresis organic layer preferably on the magnesium alloy part surface, and uniform and smooth, the beautiful appearance of this magnesium-alloy material surface paint film.
The above is the technical though that the present invention realizes its purpose.
Based on above-mentioned technical though, the present invention realizes that the technical scheme of its purpose is:
A kind of method of magnesium alloy part surface electrical electrophoresis painting dressing, its processing step comprise magnesium alloy part surface preparation and the processing of surface electrical electrophoresis painting dressing successively, and its innovative point is:
A, described magnesium alloy part surface preparation, be to handle to make arc differential oxide ceramic layer through the magnesium alloy part of clean, be in the silicate treatment solution in electrolyzer, with processed magnesium alloy part is negative electrode, with the stainless steel product is anode, between described cathode and anode, apply certain voltage, make processed magnesium alloy part surface form arc differential oxide ceramic layer;
B, described magnesium alloy part surface electrical electrophoresis painting dressing are handled, be by after the formed arc differential oxide ceramic layer in magnesium alloy part surface is cleaned, in the epoxy cathode electrodip painting, soak into and stirring, and form electrophoretic paint layer on magnesium alloy part arc differential oxide ceramic layer surface.
Can understand by above given technical scheme, the present invention is owing to adopting surface preparation and two steps of surface electrical electrophoresis painting dressing to carry out, and processing performance is good, suitability for industrialized is produced, and, described pre-treatment handles because being the magnesium alloy part surface by micro-arc oxidation, and form ceramic layer on magnesium alloy part surface, and have strong adhesion, corrosion-resistant superior performance such as good.This method is than the alramenting membrane technology, having workpiece can not be corroded, advantages such as environmental nonpollution, and it is more simple than the Technology of CN20061014404.0 patent, the finished product quality is easy to control, and more the production cost than metal process such as CN200710131372.8 vacuum splashing and plating Ni, Ag is low, the production efficiency height, environmental pollution is little, thereby has realized purpose of the present invention.
In technique scheme, the proportioning of the silicate treatment solution that the present invention advocated is that the component of described differential arc oxidation silicate treatment solution and the weight content of each component unit volume are: Na
2SiO
31～10g/L, KF 5～30g/L, C
3H
8O
310～35ml/L, NaOH 0～8g/L.This is preferred for this invention, but is not limited to this.
In technique scheme, the present invention advocates that also the processing parameter that described differential arc oxidation is handled is: current-mode is a pulse direct current, and current density is at 1～3A/dm
2In the scope, frequency is in 50～172.45HZ scope, and the treatment time, the thickness of described arc differential oxide ceramic layer was in 1～15 mu m range in 0～10min scope.
In technique scheme, the present invention advocates that the cleaning of described micro-arc oxidation ceramic layer on surface of magnesium alloy part is a ultrasonic cleaning; Scavenging period is in 5～10min scope, and infiltrating time is in 0～30s scope in cathode electrodip painting, and the work piece churning time is in 0～10s scope.But be not limited to this.In fact scavenging period is in direct ratio relevant with cleaning performance, but too much scavenging period will directly influence production efficiency.And the length of the infiltrating time of magnesium alloy part in cathode electrodip painting and the consequence that length produced of churning time are that the consequence that is produced with above-mentioned clean is identical.That is to say, described scavenging period and in cathode electrodip painting, soak into, churning time, have best cost performance, and by preferred for this invention.
In technique scheme, described electrophoretic paint layer is to be formed by electrophoresis by HED epoxy cathode electrodip painting; Its deposition condition comprises: voltage is in 100～200V scope, pH value is in 5.5～6.5 scopes, and the electrophoretic process temperature is in 20～35 ℃ of scopes, and electrophoresis time is in 20～150s scope, bake out temperature is in 160～180 ℃ of scopes, and drying time is in 20～30min scope.The trade mark of wherein said epoxy type electrocoating paint is not limited thereto.
In technique scheme, the present invention advocates, describedly forms the thickness of electrophoretic paint layer in 5～25 mu m ranges on the magnesium alloy part surface.This is preferred for this invention equally.
After technique scheme was implemented, the processing performance that the present invention had was good, and the surface coating densification is attractive in appearance, and sticking power and solidity to corrosion are good, and production cost is low, and characteristics such as production efficiency height and less energy-consumption environmental protection are conspicuous.
Description of drawings
Fig. 1 is a technical process schematic diagram of the present invention.
Embodiment
Ginseng is read accompanying drawing 1, and following examples are provided.
Embodiment 1,
The magnesium alloy part pre-treating technology, be to adopt No. 400～No. 1200 waterproof abrasive papers to polish successively magnesium alloy die casting, adopt acetone or alcohol wash 3min again, differential arc oxidation 50s in 25～40 ℃ specified proportion silicate treatment solution then, final voltage 100V, frequency 80.55HZ, base value time 2.99, current density 1A/dm
2
Described specified proportion silicate is handled (electrolysis) liquid and is consisted of:
Water glass 8g/L
Potassium monofluoride 10g/L
Glycerine (C
3H
8O
3) 18mL/L
Sodium hydroxide 2g/L
Magnesium alloy part behind the differential arc oxidation cleans with tap water and distilled water, after putting into ultrasonic cleaner cleaning 8min, change pH value over to and be in 5.90 the HED-5000 large red epoxy cathode electrodip painting and soak into 3s, stir 5s, electrophoretic voltage slowly is adjusted to 100V, is adjusted to 100V stabilized voltage time spent 5s, electrophoresis 135s, drying time 30min, 170 ℃ of bake out temperatures.
Arc differential oxide ceramic layer thickness: 12.414 μ m roughness are 0.214 μ m
Electrophoretic paint layer sticking power: 0 grade
Electrophoretic paint layer copper acetate etching time: 958h
Film quality: large red, color and luster is uniform and smooth, and the inside and outside coating total thickness is 25.7 μ m
Embodiment 2,
The magnesium alloy part pre-treating technology, be with magnesium alloy die casting adopt waterproof abrasive paper No. 400～No. 1200 successively the polishing, adopt acetone or alcohol wash 3min again, differential arc oxidation 60s in 25～40 ℃ specified proportion silicate treatment solution then, final voltage 147V, frequency 172HZ, base value time 2.99, current density 1.5A/dm
2
Described specified proportion silicate is handled (electrolysis) liquid and is consisted of:
Water glass 8g/L
Potassium monofluoride 15g/L
Glycerine (C
3H
8O
3) 12mL/L
Sodium hydroxide 3g/L
Magnesium alloy part behind the differential arc oxidation cleans with tap water and distilled water, after putting into ultrasonic cleaner cleaning 8min, change pH value over to and be in 5.90 the sky blue epoxy cathode electrodip painting of HED-5000 and soak into 10s, stir 8s, electrophoretic voltage slowly is adjusted to 160V, is adjusted to 160V stabilized voltage time spent 10s, electrophoresis 150s, drying time 20min, 180 ℃ of bake out temperatures.
Arc differential oxide ceramic layer thickness: 12.1 μ m roughness are 0.176 μ m
Electrophoretic paint layer sticking power: 0 grade
Electrophoretic paint layer copper acetate etching time: 923h
Film quality: sky blue, color and luster is uniform and smooth, and the inside and outside coating total thickness is 22.7 μ m
Embodiment 3,
The magnesium alloy part pre-treating technology, be to adopt No. 400～No. 1200 waterproof abrasive papers to polish successively magnesium alloy die casting, adopt acetone or alcohol wash 3min again, differential arc oxidation 80s in 25～40 ℃ specified proportion silicate treatment solution then, final voltage 117V, frequency 50.27HZ, base value time 2.99, current density 2A/dm
2
Described specified proportion silicate is handled (electrolysis) liquid and is consisted of:
Water glass 10g/L
Potassium monofluoride 15g/L
Glycerine (C
3H
8O
3) 18mL/L
Sodium hydroxide 2g/L
Magnesium alloy part behind the differential arc oxidation cleans with tap water and distilled water, after putting into ultrasonic cleaner cleaning 8min, change pH value over to and be in 5.90 the HED-5000 purple epoxy cathode electrodip painting and soak into 15s, stir 10s, electrophoretic voltage slowly is adjusted to 160V, is adjusted to 160V stabilized voltage time spent 12s, electrophoresis 90s, drying time 25min, 175 ℃ of bake out temperatures.
Arc differential oxide ceramic layer thickness: 12.46 μ m roughness are 0.224 μ m
Electrophoretic paint layer sticking power: 0 grade
Electrophoretic paint layer copper acetate etching time: 996h
Film quality: purple, color and luster is uniform and smooth, and the inside and outside coating total thickness is 17.74 μ m
Used epoxy cathode electrodip painting in above-mentioned 3 examples is not limited to HED-5000, for example can be HED-2000 or HED-6000 or the like.Because the cost performance height of HED-5000 epoxy cathode electrodip painting is so the present invention actively recommends.
By above 3 embodiment as seen, the present invention is very successful.
Claims (6)
1. the method for a magnesium alloy part surface electrical electrophoresis painting dressing, its processing step comprise that successively magnesium alloy part surface preparation and surface electrical electrophoresis painting dressing handle, and it is characterized in that:
A, described magnesium alloy part surface preparation are to handle make arc differential oxide ceramic layer through the magnesium alloy part of clean; Being in the silicate treatment solution in electrolyzer, is negative electrode with processed magnesium alloy part, is anode with the stainless steel product, applies certain voltage between described cathode and anode, makes processed magnesium alloy part surface form arc differential oxide ceramic layer;
B, described magnesium alloy part surface electrical electrophoresis painting dressing are handled, be by after the formed arc differential oxide ceramic layer in magnesium alloy part surface is cleaned, in the epoxy cathode electrodip painting, soak into and stirring, and form electrophoretic paint layer on magnesium alloy part arc differential oxide ceramic layer surface.
2. the method for magnesium alloy part surface electrical electrophoresis painting dressing according to claim 1 is characterized in that: the component of described differential arc oxidation silicate treatment solution and the weight content of each component unit volume are: Na
2SiO
31～10g/L, KF 5～30g/L, C
3H
8O
310～35ml/L, NaOH 0～8g/L.
3. the method for magnesium alloy part surface electrical electrophoresis painting dressing according to claim 1 is characterized in that, the processing parameter that described differential arc oxidation is handled is: current-mode is a pulse direct current, and current density is at 1～3A/dm
2In the scope, frequency is in 50～172.45HZ scope, and the treatment time, the thickness of described arc differential oxide ceramic layer was in 1～15 mu m range in 0～10min scope.
4. the method for magnesium alloy part surface electrical electrophoresis painting dressing according to claim 1 is characterized in that, the cleaning of described micro-arc oxidation ceramic layer on surface of magnesium alloy part is a ultrasonic cleaning; Scavenging period is in 5～10min scope, and infiltrating time is in 0～30s scope in cathode electrodip painting, and the work piece churning time is in 0～10s scope.
5. the method for magnesium alloy part surface electrical electrophoresis painting dressing according to claim 1 is characterized in that, described electrophoretic paint layer is to be formed by electrophoresis by HED epoxy cathode electrodip painting; Its deposition condition comprises: voltage is in 100～200V scope, pH value is in 5.5～6.5 scopes, and the electrophoretic process temperature is in 20～35 ℃ of scopes, and electrophoresis time is in 20～150s scope, bake out temperature is in 160～180 ℃ of scopes, and drying time is in 20～30min scope.
6. the method for magnesium alloy part surface electrical electrophoresis painting dressing according to claim 5 is characterized in that, the described thickness of electrophoretic paint layer that forms on magnesium alloy part surface is in 5～25 mu m ranges.
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|---|---|---|---|
| CN 201010185992 CN101831685A (en) | 2010-05-28 | 2010-05-28 | Electrophoretic coating method for surface of magnesium alloy part |
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|---|---|---|---|
| CN 201010185992 CN101831685A (en) | 2010-05-28 | 2010-05-28 | Electrophoretic coating method for surface of magnesium alloy part |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560486A (en) * | 2011-12-08 | 2012-07-11 | 东莞宜安科技股份有限公司 | Surface treatment and coating technology for magnesium alloy surface to resist neutral salt spray test |
| CN102677127A (en) * | 2012-06-11 | 2012-09-19 | 西北有色金属研究院 | Magnesium alloy microarc oxidation-electrophoresis composite coating and preparation method thereof |
| CN102943298A (en) * | 2012-10-11 | 2013-02-27 | 创金美科技（深圳）有限公司 | Magnesium alloy composite surface treatment method and magnesium alloy watch case |
| TWI782796B (en) * | 2021-11-19 | 2022-11-01 | 薩摩亞商大煜國際有限公司 | High gloss electrophoretic coating process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908246A (en) * | 2006-07-27 | 2007-02-07 | 西安理工大学 | Magnesium alloy differential arc electrophoresis composite surface treating method |
| CN101377000A (en) * | 2007-08-28 | 2009-03-04 | 汉达精密电子(昆山)有限公司 | Electrophoresis coating method for micro-arc oxidation workpiece |
-
2010
- 2010-05-28 CN CN 201010185992 patent/CN101831685A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908246A (en) * | 2006-07-27 | 2007-02-07 | 西安理工大学 | Magnesium alloy differential arc electrophoresis composite surface treating method |
| CN101377000A (en) * | 2007-08-28 | 2009-03-04 | 汉达精密电子(昆山)有限公司 | Electrophoresis coating method for micro-arc oxidation workpiece |
Non-Patent Citations (1)
| Title |
|---|
| 《硅酸盐学报》 20050930 王德云等 微弧氧化技术的研究进展 第1133-1138页 1-6 第33卷, 第9期 2 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560486A (en) * | 2011-12-08 | 2012-07-11 | 东莞宜安科技股份有限公司 | Surface treatment and coating technology for magnesium alloy surface to resist neutral salt spray test |
| CN102677127A (en) * | 2012-06-11 | 2012-09-19 | 西北有色金属研究院 | Magnesium alloy microarc oxidation-electrophoresis composite coating and preparation method thereof |
| CN102677127B (en) * | 2012-06-11 | 2014-08-06 | 西北有色金属研究院 | Magnesium alloy microarc oxidation-electrophoresis composite coating and preparation method thereof |
| CN102943298A (en) * | 2012-10-11 | 2013-02-27 | 创金美科技（深圳）有限公司 | Magnesium alloy composite surface treatment method and magnesium alloy watch case |
| TWI782796B (en) * | 2021-11-19 | 2022-11-01 | 薩摩亞商大煜國際有限公司 | High gloss electrophoretic coating process |
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Application publication date: 20100915 |