CN117230505A - Metal structural member and preparation method thereof - Google Patents
Metal structural member and preparation method thereof Download PDFInfo
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- CN117230505A CN117230505A CN202210639688.2A CN202210639688A CN117230505A CN 117230505 A CN117230505 A CN 117230505A CN 202210639688 A CN202210639688 A CN 202210639688A CN 117230505 A CN117230505 A CN 117230505A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 76
- 239000002184 metal Substances 0.000 title claims abstract description 76
- 238000002360 preparation method Methods 0.000 title claims abstract description 37
- 239000010410 layer Substances 0.000 claims abstract description 194
- 238000000576 coating method Methods 0.000 claims abstract description 179
- 239000011248 coating agent Substances 0.000 claims abstract description 172
- 239000000758 substrate Substances 0.000 claims abstract description 53
- 239000003973 paint Substances 0.000 claims abstract description 48
- 239000000463 material Substances 0.000 claims abstract description 46
- 238000001962 electrophoresis Methods 0.000 claims abstract description 43
- 239000011247 coating layer Substances 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000005507 spraying Methods 0.000 claims abstract description 28
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 claims abstract description 26
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 27
- 238000004519 manufacturing process Methods 0.000 claims description 20
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 18
- 239000011777 magnesium Substances 0.000 claims description 18
- 229910052749 magnesium Inorganic materials 0.000 claims description 18
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 18
- 238000004040 coloring Methods 0.000 claims description 16
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 230000001590 oxidative effect Effects 0.000 claims description 10
- 239000004115 Sodium Silicate Substances 0.000 claims description 9
- 239000011698 potassium fluoride Substances 0.000 claims description 9
- 235000003270 potassium fluoride Nutrition 0.000 claims description 9
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 9
- 238000004070 electrodeposition Methods 0.000 claims description 7
- 230000003647 oxidation Effects 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- 238000010422 painting Methods 0.000 claims description 7
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 38
- 238000005260 corrosion Methods 0.000 abstract description 13
- 230000007797 corrosion Effects 0.000 abstract description 12
- 239000011229 interlayer Substances 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 10
- 230000008439 repair process Effects 0.000 abstract description 7
- 239000000843 powder Substances 0.000 description 12
- 229910000861 Mg alloy Inorganic materials 0.000 description 10
- 238000004512 die casting Methods 0.000 description 7
- 239000004925 Acrylic resin Substances 0.000 description 6
- 229920000178 Acrylic resin Polymers 0.000 description 6
- 239000011324 bead Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000003822 epoxy resin Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 229920000647 polyepoxide Polymers 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 238000004513 sizing Methods 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005524 ceramic coating Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000007591 painting process Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Laminated Bodies (AREA)
Abstract
The application relates to the technical field of electronic products, in particular to a metal structural member and a preparation method thereof, comprising the following steps: providing a substrate; performing micro-arc oxidation treatment on the surface of the base material to form an oxide layer; performing electrophoretic coating on the oxide layer to form an electrophoretic layer; and spraying paint on the electrophoresis layer to form a coating. According to the preparation method disclosed by the application, before the coating is formed on the surface of the substrate, the micro-arc oxidation electrochemical process is utilized to generate the ceramic-like oxide film, so that the corrosion resistance reliability is improved, and meanwhile, the electrophoretic layer is deposited by utilizing the electrophoretic coating process and combined with the oxide layer formed by the micro-arc oxidation treatment to provide a better protection effect and interlayer bonding force, so that the coating can be tightly combined with the electrophoretic layer in the process of spraying paint to form the coating, the manual repair and recoating can be effectively avoided, the number of coating layers is reduced, and the coating thickness is reduced, so that the coating appearance is ensured to be good, the fineness of a metal structural member is greatly improved, and a better CMF effect is presented.
Description
Technical Field
The application relates to the technical field of electronic products, in particular to a metal structural member and a preparation method thereof.
Background
Along with the increasing demand of mobile phones, flat panels, PCs and other terminal consumer electronic products for light weight, the application of light metals (such as magnesium alloy) in product structural members is more and more extensive, and the light metal structural members are required to have the CMF (Color-Material-Finishing) effect and strict anti-corrosion reliability requirements. However, the light metal structural member in the related art has problems of low definition, poor corrosion resistance reliability, thick coating, complex manufacturing process, high manufacturing cost and the like.
Disclosure of Invention
The application provides a metal structural member and a preparation method thereof, which are used for solving the problems of low definition, poor corrosion resistance reliability, thick coating, complex preparation process, high preparation cost and the like of the existing light metal structural member.
According to a first aspect of the present application, there is provided a method of manufacturing a metal structural member, comprising the steps of:
providing a substrate;
performing micro-arc oxidation treatment on the surface of the base material to form an oxide layer;
performing electrophoretic coating on the oxide layer to form an electrophoretic layer;
and spraying paint on the electrophoresis layer to form a coating.
In one possible design, the oxide layer is a non-pigmented oxide layer or a pigmented oxide layer.
In one possible design, the electrophoretic layer is a transparent electrophoretic layer or a colored electrophoretic layer.
In one possible design, the coating is a clear coating or a tinted coating.
In one possible design, the substrate is selected from one of a magnesium AZ31 rolled sheet, a magnesium AZ31 extruded sheet, a magnesium AZ91 rolled sheet, a magnesium AZ91 extruded sheet, an aluminum 5 series sheet, an aluminum 6 series sheet, or an aluminum 7 series sheet.
In one possible design, the thickness of the substrate is 0.6 mm to 1.2 mm.
In one possible design, the oxide layer has a brightness L value of 70 to 90.
In one possible design, the oxide layer has a thickness of 4 μm to 12 μm.
In one possible design, the conditions of the micro-arc oxidation process include: the oxidizing solution comprises sodium silicate, potassium hydroxide and potassium fluoride; the substrate was used as the anode and stainless steel as the cathode, with a maximum operating voltage of 350V.
In one possible design, the sodium silicate is present in the oxidizing solution at a mass concentration of 5g/L to 7g/L, the potassium hydroxide is present at a mass concentration of 10g/L to 12g/L, and the potassium fluoride is present at a mass concentration of 7g/L to 9g/L.
In one possible design, the thickness of the electrophoretic layer is 10 μm to 20 μm.
In one possible design, the electrodeposition coating is anodic electrodeposition coating or cathodic electrodeposition coating.
In one possible design, the conditions of the electrocoating are: the working voltage is 30V-120V, the curing temperature is 120-180 ℃, and the time is more than 0 and less than or equal to 2min.
In one possible design, the method of preparation further comprises the steps of:
before the electrophoretic coating is carried out on the oxide layer, the base material with the oxide layer is required to be cleaned by ultrasonic waves; the ultrasonic cleaning time is 7min-10min.
In one possible design, the painting of the electrophoretic layer to form a coating layer includes the steps of: and spraying paint on the electrophoresis layer to form a first coating.
In one possible design, the first coating is a clear coating or a pigmented coating.
In one possible design, the thickness of the first coating is 15 μm to 30 μm.
In one possible design, the material of the first coating is selected from PU or UV.
In one possible design, the painting of the electrophoretic layer to form a coating layer further includes the steps of: and spraying paint on the electrophoresis layer to form a second coating, and spraying paint on the second coating to form the first coating.
In one possible design, the thickness of the second coating is 5 μm to 10 μm.
According to a second aspect of the present application, there is also provided a metal structural member comprising a substrate, and an oxide layer, an electrophoretic layer and a coating layer formed on the surface of the substrate and sequentially disposed in a direction away from the substrate.
The application has the beneficial effects that:
according to the preparation method of the metal structural member, before the base material is sprayed with paint to form the coating, the surface of the base material is primed by combining micro-arc oxidation treatment with electrophoretic coating, a ceramic-like oxide film is generated by utilizing a micro-arc oxidation electrochemical process, so that the corrosion resistance reliability is improved, meanwhile, an electrophoretic layer is deposited by utilizing an electrophoretic coating process and is combined with an oxide layer formed by the micro-arc oxidation treatment, and a better protection effect and interlayer bonding force are provided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
Fig. 1 is a schematic structural view of a metal structural member according to embodiment 1 of the present application;
fig. 2 is a schematic structural view of a metal structural member according to embodiment 2 of the present application.
Reference numerals:
1-a substrate;
a 2-oxide layer;
3-an electrophoretic layer;
4-coating;
41-a first coating;
42-second coating.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
Detailed Description
For a better understanding of the technical solution of the present application, the following detailed description of the embodiments of the present application refers to the accompanying drawings.
As a light metal structural member, the magnesium alloy structural member is increasingly used in terminal consumer electronics products such as mobile phones, tablets, PCs and the like, and in the related art, the magnesium alloy structural member is generally prepared by adopting the following two preparation methods:
in the first preparation method, die-casting magnesium alloy is generally adopted as a base material, and then a film/passivation process and a coating process are sequentially carried out on the die-casting magnesium alloy base material. Disadvantages of this preparation method include: 1. the die-casting magnesium alloy base material has the defects of sand holes and the like, the surface quality is poor, the protection reliability of the coating film to the base material is insufficient, oxidation corrosion easily occurs in the preparation process, the reliability of the coating is affected, and the risk of protection reliability exists in the application of a user. 2. Generally, 2-3 layers of priming paint, 2-3 layers of middle color paint and 2-3 layers of finish paint are required to be sequentially formed on the surface of a substrate, manual repair and recoating are involved in the construction process, the preparation process is complex, the actual coating is 5-7 times, the coating is thicker (the total film thickness is generally 50-170 mu m), the cost is increased, the edge design is round, the coating is easy to produce defects such as finishing paint and the like, and the product fineness is insufficient.
In the second preparation method, die-casting magnesium alloy is generally adopted as a base material, then a micro-arc oxidation process and a coating process are sequentially carried out on the die-casting magnesium alloy base material, the preparation method adopts the micro-arc oxidation process to prime the base material before coating, so that the corrosion resistance of the base material is enhanced, and the CMF effect is realized by the coating. Disadvantages of this preparation method include: the micro-arc oxidation process can improve the corrosion resistance of the die-casting magnesium alloy base material, but cannot completely compensate the corrosion risk caused by the defects of the die-casting magnesium alloy base material, and the coating process also involves manual repair and recoating, recoats and leaks bare magnesium to cause reliability risk, and recoats and causes surface fineness problem.
The application provides a preparation method of a metal structural member, which aims to solve the problems of low definition, poor corrosion resistance reliability, thick coating, complex preparation process, high preparation cost and the like of the conventional light metal structural member.
In a first aspect, an embodiment of the present application provides a method for manufacturing a metal structural member, including the steps of:
providing a substrate;
performing micro-arc oxidation treatment on the surface of the base material to form an oxide layer;
performing electrophoretic coating on the oxide layer to form an electrophoretic layer;
and spraying paint on the electrophoresis layer to form a coating.
It should be noted that micro-arc oxidation is also called plasma electrolytic oxidation, and mainly depends on matching adjustment of electrolyte and electric parameters, and under the action of instantaneous high temperature and high pressure generated by arc discharge, a modified ceramic coating mainly comprising matrix metal oxide and supplemented with electrolyte component grows on the surfaces of metals such as aluminum, magnesium, titanium and the like, and the corrosion resistance and wear resistance of the modified ceramic coating are obviously superior to those of the traditional anodic oxidation coating. The electrophoretic coating is a coating method in which particles such as pigment and resin suspended in an electrophoretic liquid are directionally transferred and deposited on the surface of a substrate, which is one of electrodes, by an applied electric field.
In the scheme, the preparation method of the metal structural member uses the mode of combining micro-arc oxidation treatment with electrophoretic coating to prime the surface of the base material before the base material is sprayed with paint to form the coating, and utilizes the micro-arc oxidation electrochemical process to generate a ceramic-like oxide film, so that the corrosion resistance reliability is improved.
As an alternative technical scheme of the application, the oxide layer is a non-coloring oxide layer or a coloring oxide layer.
It is understood that coloring salt may be optionally added to the oxidizing solution during the micro-arc oxidation treatment to make the oxide layer a colored oxide layer (e.g., black, brown, etc. with a brightness L value of 40 or less), or coloring salt may be optionally not added to make the oxide layer a non-colored oxide layer. The oxide layer can be designed into a coloring oxide layer, so that the number of coating layers can be reduced, the coating layers (thinnest to one coating) can be reduced by matching with the metal plate material, the manual repair and recoating between layers are avoided, and the reliability is improved.
As an optional technical scheme of the application, the electrophoresis layer is a transparent electrophoresis layer or a coloring electrophoresis layer;
it is understood that color paste with color can be optionally added into the electrophoretic fluid to make the electrophoretic layer be a colored oxide layer in the electrophoretic coating process, or no color paste can be optionally added into the electrophoretic fluid to make the electrophoretic layer be a non-colored oxide layer. Through can design into the coloured electrophoresis layer with the electrophoresis layer, can reduce the coating number, cooperate sheet metal material can reduce the coating (thinnest to one scribble), avoid the manual work between the layers to repair and recoat, promote the reliability.
As an alternative solution of the present application, the coating is a transparent coating or a colored coating.
It will be appreciated that during the painting process, the paint may be chosen to be colored so that the coating is a pigmented coating, or the paint may be chosen to be clear so that the coating is a clear coating.
As an alternative to the application, the coating may also be a decorative coating. It can be understood that the metal-like powder, bead powder, fluff particles and the like can be added in the sprayed paint, so that higher-end CMF effect can be realized, and differentiated and higher-end CMF effect can be realized.
Different CMF effects can be achieved by choosing any coloring match in the oxide layer, the electrophoretic layer and the coating.
As an alternative technical scheme of the application, the base material is selected from one of magnesium AZ31 rolled plate, magnesium AZ31 extruded plate, magnesium AZ91 rolled plate, magnesium AZ91 extruded plate, aluminum 5 series plate, aluminum 6 series plate or aluminum 7 series plate.
As an optional technical scheme of the application, the thickness of the base material is 0.6 mm-1.2 mm.
Alternatively, the thickness of the base material may be 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, or the like, but may be other values within the above range, and is not limited thereto. It can be appreciated that the application requirements of the metal structural part in the terminal consumer electronic products such as mobile phones, tablets, PCs and the like can be met by selecting a substrate with a proper thickness.
As an alternative technical scheme of the application, the brightness L value of the oxide layer is 70-90.
Alternatively, the brightness L of the oxide layer may be 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, or 90, or the like, but may be other values within the above range, which is not limited thereto. It can be understood that the brightness of the oxide layer can be ensured by limiting the brightness L value of the oxide layer, so as to improve the visual effect of the metal structural member.
As an alternative embodiment of the application, the thickness of the oxide layer is 4 μm to 12 μm.
Alternatively, the thickness of the oxide layer may be 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, or the like, but other values within the above range are also possible, and are not limited thereto. It is understood that by limiting the thickness of the oxide layer, the corrosion prevention reliability of the metal structural member and the interlayer bonding force with the electrophoretic layer can be ensured while the film layer on the surface of the substrate is in an ideal thickness range. When the thickness of the oxide layer is less than 4 mu m, the corrosion resistance reliability of the metal structural member and the interlayer binding force between the oxide layer and the electrophoresis layer are affected, and when the thickness of the oxide layer is more than 12 mu m, the thickness of the film layer on the surface of the substrate is increased, and the fineness of the metal structural member is affected.
As an alternative technical scheme of the application, the conditions of the micro-arc oxidation treatment comprise: the oxidizing solution comprises sodium silicate, potassium hydroxide and potassium fluoride; the substrate was used as the anode and stainless steel was used as the cathode with a maximum operating voltage of 350V.
It is understood that the micro-arc oxidation treatment effect can be ensured by limiting the conditions of the micro-arc oxidation treatment so as to form a desired oxide layer on the surface of the substrate.
As an optional technical scheme of the application, in the oxidation solution, the mass concentration of sodium silicate is 5g/L-7g/L, the mass concentration of potassium hydroxide is 10g/L-12g/L, and the mass concentration of potassium fluoride is 7g/L-9g/L.
Alternatively, the sodium silicate may be present in the oxidizing liquid at a mass concentration of 5g/L, 5.2g/L, 5.5g/L, 5.8g/L, 6g/L, 6.3g/L, 6.5g/L, 6.8g/L, 7g/L, etc., the potassium hydroxide may be present at a mass concentration of 10g/L, 10.2g/L, 10.5g/L, 10.8g/L, 11g/L, 11.2g/L, 11.5g/L, 11.8g/L, 12g/L, etc., and the potassium fluoride may be present at a mass concentration of 7g/L, 7.2g/L, 7.5g/L, 7.8g/L, 8.0g/L, 8.2g/L, 8.5g/L, 8.8g/L, 9g/L, etc., although other values within the above range are not limited thereto. It can be understood that the micro-arc oxidation treatment effect can be ensured by limiting the mass concentration of each component in the oxidation liquid, so that an ideal oxidation layer is formed on the surface of the substrate.
As an alternative technical scheme of the application, the thickness of the electrophoresis layer is 10 mu m-20 mu m;
alternatively, the thickness of the electrophoretic layer may be 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, or 20 μm, etc., but other values within the above range are also possible, and are not limited thereto. It can be understood that the thickness of the electrophoretic layer is limited, so that the interlayer binding force between the oxide layer and the electrophoretic layer can be ensured, the coating of the coating is facilitated, and the film layer on the surface of the substrate is in an ideal thickness range. When the thickness of the electrophoresis layer is less than 10 mu m, the interlayer binding force between the oxidation layer and the electrophoresis layer is influenced, the coating of the coating is influenced, and when the thickness of the electrophoresis layer is more than 20 mu m, the thickness of the film layer on the surface of the substrate is increased, and the fineness of the metal structural part is influenced.
As an alternative technical scheme of the application, the electrophoretic coating adopts anode electrophoretic coating or cathode electrophoretic coating.
As an alternative technical scheme of the application, the conditions of the electrophoretic coating are as follows: the working voltage is 30V-120V, the curing temperature is 120-180 ℃, and the time is more than 0 and less than or equal to 2min.
It will be appreciated that by limiting the conditions of the electrocoating, the electrocoating effect can be ensured to form a desired electrocoat on the oxide layer.
As an optional technical scheme of the application, the preparation method further comprises the following steps:
before the electrophoretic coating is carried out on the oxide layer, the base material with the oxide layer is required to be cleaned by ultrasonic waves; the ultrasonic cleaning time is 7min-10min. Alternatively, the ultrasonic cleaning time may be 7min, 7.5min, 8min, 8.5min, 9min, 9.5min, or 10min, or the like, but may be other values within the above range, which is not limited thereto.
It can be understood that, before the electrophoretic coating is performed on the oxide layer, the substrate on which the oxide layer is formed is subjected to ultrasonic cleaning, so that the dryness of the surface of the substrate can be ensured, and the electrophoretic coating effect is further ensured, so that an ideal electrophoretic layer is formed on the oxide layer. Through limiting the ultrasonic time, a good cleaning effect can be achieved, and meanwhile, the binding force between the oxide layer and the base material is not affected. When the ultrasonic time is less than 7min, the cleaning effect is not ideal, and when the ultrasonic time is more than 10min, the bonding force between the oxide layer and the substrate may be affected.
As an alternative technical scheme of the application, the step of spraying paint on the electrophoretic layer to form a coating comprises the following steps: and spraying paint on the electrophoresis layer to form a first coating.
As an alternative solution of the present application, the first coating is a transparent coating or a colored coating.
It will be appreciated that when the first coating is a clear coating, it may be achieved by coloring the oxide layer or the electrophoretic layer if it is desired to render the metallic structure to exhibit the CMF effect. When the first coating is a colored coating, the first coating can display CMF effect, and can also be matched with a colored oxide layer and/or an electrophoresis layer to display high-end CMF effect.
As an alternative embodiment of the present application, the thickness of the first coating layer is 15 μm to 30. Mu.m.
Alternatively, the thickness of the first coating layer may be 15 μm, 18 μm, 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, or the like, but may be other values within the above range, without limitation. It will be appreciated that the thickness of the first coating layer is defined so as to ensure the interlayer bonding force between the electrophoretic layer and the first coating layer, and at the same time, the film layer on the surface of the substrate is in a desired thickness range. When the thickness of the first coating is less than 15 mu m, the interlayer binding force between the first coating and the electrophoresis layer can be influenced, and when the thickness of the first coating is more than 30 mu m, the thickness of the film layer on the surface of the substrate can be increased, and the fineness of the metal structural part is influenced.
As an alternative embodiment of the application, the material of the first coating is selected from PU or UV.
As an optional technical solution of the present application, the step of spraying paint on the electrophoretic layer to form a coating layer further includes the following steps: and spraying paint on the electrophoresis layer to form a second coating, and spraying paint on the second coating to form the first coating.
It will be appreciated that when the second coating layer is used as a primer, a first coating layer may be further coated on the second coating layer in order to make the coating layer exhibit CMF effects, and the first coating layer may be colored with color paste or added with bead powder, silver powder, fluff powder, etc. to achieve different CMF effects.
As an alternative to the application, the material of the second coating may be selected from PU or UV.
As an alternative embodiment of the application, the thickness of the second coating layer is 5 μm to 10 μm.
Alternatively, the thickness of the second coating layer may be 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, or the like, but may be other values within the above range, without limitation. It will be appreciated that the thickness of the second coating layer is defined so as to ensure the interlayer bonding force between the second coating layer and the electrophoretic layer and between the second coating layer and the first coating layer, and at the same time, the film layer on the surface of the substrate is in a desired thickness range. When the thickness of the second coating is less than 5 mu m, the interlayer binding force between the second coating and the electrophoresis layer and between the second coating and the first coating can be influenced, and when the thickness of the second coating is more than 10 mu m, the thickness of the film layer on the surface of the substrate can be increased, and the fineness of the metal structural part is influenced.
In a second aspect, the present application further provides a metal structural member, where the metal structural member may be applied to a terminal consumer electronic product such as a mobile phone, a tablet, a PC, etc., and the metal structural member is prepared by the preparation method of the present application, as shown in fig. 1, the metal structural member of the present application includes a substrate 1, and an oxide layer 2, an electrophoretic layer 3, and a coating layer formed on a surface of the substrate 1 and sequentially disposed in a direction away from the substrate 1, where the coating layer is a first coating layer 41.
The following describes embodiments of the present application in more detail. The embodiments of the present application are not limited to the following specific embodiments. The modification can be appropriately performed within the scope of protection.
Example 1
As shown in fig. 1, the metal structural member of the present embodiment includes a substrate 1, and an oxide layer 2, an electrophoretic layer 3 and a first coating 41 formed on the surface of the substrate 1 and sequentially disposed in a direction away from the substrate 1, wherein the oxide layer 2 is a non-colored oxide layer, the electrophoretic layer 3 is a colored electrophoretic layer, the first coating 41 is a colored coating, and the material of the colored coating is selected from UV. The preparation method of the metal structural part comprises the following steps:
step S1: providing a substrate 1, wherein the substrate 1 is selected from magnesium AZ31 extruded sheet materials, and the thickness of the substrate 1 is 0.6 mm-1.2 mm.
Step S2: the surface of the substrate 1 is subjected to micro-arc oxidation treatment to form an oxide layer 2. Wherein the thickness of the oxide layer 2 is 4-12 mu m, the brightness L value is 70-90, and the preparation method of the oxide layer 2 is as follows: the oxide layer 2 is prepared by using 5g/L to 7g/L of sodium silicate, 10g/L to 12g/L of potassium hydroxide and 7g/L to 9g/L of potassium fluoride as an oxidizing solution, a base material as an anode, stainless steel as a cathode and the maximum voltage of 350V.
Step S3: after the oxide layer 2 is formed, the ultrasonic cleaning is carried out for 7 to 10 minutes.
Step S4: and (3) cleaning, then, entering an electrophoresis tank, and performing electrophoretic coating on the oxide layer 2 to form an electrophoresis layer 3. Wherein, the electrophoretic coating adopts cathode electrophoretic coating, wherein, the electrophoretic liquid for electrophoretic coating is added with sizing agent containing epoxy resin or acrylic resin, the sizing agent is added with color paste with color, wherein, the color paste accounts for less than or equal to 20 percent of the sizing agent, the color can be adjusted according to the requirement, and the color paste can be black color paste with the brightness L value of 20 to 50; the film forming working voltage is 30V-120V, the electrophoresis time is more than 0 and less than or equal to 2min, and the curing temperature is 120-180 ℃; the thickness of the formed electrophoretic layer 3 is 10 μm to 15 μm.
Step S5: a first coating 41 is formed by painting on the electrophoretic layer 3. Wherein, the material used for paint spraying is colored UV paint, the proportion of color paste in the colored UV paint is less than or equal to 30 percent, and the UV energy used for paint spraying is 800mJ/cm 2 ～2500mJ/cm 2 Bead powder, silver powder and fluff powder (particle size 5-30 μm) can be added into the colored UV paint, and the thickness of the first coating 41 is 15-30 μm. The coating layer 4 is a first coating layer 41, and the number of layers is one.
The technical effects are as follows: compared with the prior art, the thickness of the film formed on the surface of the substrate 1 by the metal structural part in the embodiment is 15-30 mu m, the average film thickness is reduced by 90 mu m, the number of layers of the coating 4 is one, the number of the coating layers is reduced by 4-6 layers, the coating 4 is thin, the spraying defects are few, the edge design of the product can be less than R0.5, the fineness of the whole product is high, the pencil hardness of the surface of the coating 4 can reach 4-9H, and the pencil hardness is superior to 2H of the pencil hardness of the prior art. The metal structural member of the embodiment is subjected to neutral salt spray test, and the alternating damp-heat ring test can reach more than 500H under the conditions of high temperature and high humidity of 55-95 percent of humidity.
The preparation method of the metal structural part is simple in working procedures, all film forming working procedures can be finished by adopting automatic line body equipment, manual repair is not involved, uncertain interference is avoided, bare magnesium is not leaked in the preparation process, and reliability is guaranteed. The preparation method of the metal structural part of the embodiment can adjust the proportion of color paste in the electrophoresis layer 3 and the proportion of color paste in the coating layer 4 according to actual needs to realize the composite CMF effect, and meanwhile, bead powder, silver powder and fluff powder (with the particle size of 5-30 μm) can be added into the coating layer 4 to realize different CMF effects by matching with the coloring of the electrophoresis layer 3.
Example 2
As shown in fig. 2, the metal structural member of the present embodiment includes a substrate 1, and an oxide layer 2, an electrophoretic layer 3 and a coating layer 4 formed on the surface of the substrate 1 and sequentially disposed in a direction away from the substrate 1, wherein the oxide layer 2 is a non-colored oxide layer, the electrophoretic layer 3 is a colored electrophoretic layer, the coating layer 4 includes a first coating 41 and a second coating 42, the second coating 42 is a transparent coating, the first coating 41 is a colored coating, and the material of the colored coating is selected from UV. The preparation method of the metal structural part comprises the following steps:
step S1: providing a substrate 1, wherein the substrate 1 is selected from magnesium AZ31 extruded sheet materials, and the thickness of the substrate 1 is 0.6 mm-1.2 mm.
Step S2: the surface of the substrate 1 is subjected to micro-arc oxidation treatment to form an oxide layer 2. Wherein the thickness of the oxide layer 2 is 4-12 mu m, the brightness L value is 70-90, and the preparation method of the oxide layer 2 is as follows: the oxide layer 2 is prepared by using 5g/L to 7g/L of sodium silicate, 10g/L to 12g/L of potassium hydroxide and 7g/L to 9g/L of potassium fluoride as an oxidizing solution, a base material as an anode, stainless steel as a cathode and the maximum voltage of 350V.
Step S3: after the oxide layer 2 is formed, the ultrasonic cleaning is carried out for 7 to 10 minutes.
Step S4: and (3) cleaning, then, entering an electrophoresis tank, and performing electrophoretic coating on the oxide layer 2 to form an electrophoresis layer 3. Wherein, the electrophoretic coating adopts cathode electrophoretic coating, wherein, the electrophoretic liquid for electrophoretic coating is added with sizing agent containing epoxy resin or acrylic resin, the sizing agent is added with color paste with color, wherein, the color paste accounts for less than or equal to 20 percent of the sizing agent, the color can be adjusted according to the requirement, and the color paste can be black color paste with the brightness L value of 20 to 50; the film forming working voltage is 30V-120V, the electrophoresis time is more than 0 and less than or equal to 2min, and the curing temperature is 120-180 ℃; the thickness of the formed electrophoretic layer 3 is 10 μm to 15 μm.
Step S5: the first painting is performed on the electrophoretic layer 3 to form a second coating 42, and the second painting is performed on the second coating 42 to form a first coating 41. Wherein, the second coating 42 adopts transparent paint, and the thickness of the second coating 42 is 5 μm-10 μm; the material used for the paint spraying of the first coating 41 is colored UV paint, the proportion of color paste in the colored UV paint is less than or equal to 30%, and the UV energy used for the paint spraying is 800mJ/cm 2 ～2500mJ/cm 2 Bead powder, silver powder and fluff powder (particle size 5-30 μm) can be added into the colored UV paint, and the thickness of the first coating 41 is 15-30 μm. The number of layers of the coating layer 4 is two.
Compared with the prior art, the thickness of the film formed on the surface of the substrate 1 by the metal structural part in the embodiment is 35-55 mu m, the average film thickness is reduced by 70 mu m, the number of layers of the coating 4 is two, the number of the coating is reduced by 3-5 layers, the coating 4 is thin, spraying defects are few, the edge design of the product can be less than R0.5, the fineness of the whole product is high, the pencil hardness of the surface of the coating 4 can reach 4-9H, and the pencil hardness is superior to 2H of the pencil hardness of the prior art. The metal structural member of the embodiment is subjected to neutral salt spray test, and the alternating damp-heat ring test can reach more than 500H under the conditions of high temperature and high humidity of 55-95% of humidity.
The preparation method of the metal structural part is simple in working procedures, all film forming working procedures can be finished by adopting automatic line body equipment, manual repair is not involved, uncertain interference is avoided, bare magnesium is not leaked in the preparation process, and reliability is guaranteed. The preparation method of the metal structural part of the embodiment can adjust the proportion of color paste in the electrophoresis layer 3 and the proportion of color paste in the coating layer 4 according to actual needs to realize the composite CMF effect, and meanwhile, bead powder, silver powder and fluff powder (with the particle size of 5-30 μm) can be added into the coating layer 4 to realize different CMF effects by matching with the coloring of the electrophoresis layer 3.
Example 3
In comparison with embodiment 1, in the metal structural member of this embodiment, the electrophoretic layer 3 is a colored electrophoretic layer 3 and is a transparent electrophoretic layer, and other technical features are the same as those of the metal structural member of embodiment 1. In the method for producing a metal structural member of this example, in step S4, a paste containing an epoxy resin or an acrylic resin is added to the electrophoretic fluid for electrophoretic coating, and a color paste having a color is not added to the paste, and the other production methods are the same as in example 1.
The metal structural member of the present embodiment has the same technical effects as those of embodiment 1 except that the CMF effect exhibited is different from that of embodiment 1.
Example 4
In comparison with embodiment 2, in the metal structural member of this embodiment, the electrophoresis layer 3 is a transparent electrophoresis layer, and other technical features are the same as those of the metal structural member of embodiment 2. In the method for producing a metal structural member of this example, in step S4, a paste containing an epoxy resin or an acrylic resin is added to the electrophoretic fluid for electrophoretic coating, and a color paste having a color is not added to the paste, and the other production methods are the same as in example 2.
The metal structural member of the present embodiment has the same technical effects as those of embodiment 2 except that the CMF effect exhibited is different from that of embodiment 2.
Example 5
In comparison with embodiment 1, in the metal structural member of this embodiment, the first coating 41 is a transparent UV coating, and other technical features are the same as those of the metal structural member of embodiment 1. In the method for manufacturing a metal structural member in this embodiment, in step S5, a transparent UV paint is selected as a material for paint spraying, and other manufacturing methods are the same as those in embodiment 1.
The metal structural member of the present embodiment has the same technical effects as those of embodiment 1 except that the CMF effect exhibited is different from that of embodiment 1.
Example 6
In comparison with embodiment 2, in the metal structural member of this embodiment, the second coating 42 is a transparent coating, the first coating 41 is a transparent UV coating, and other technical features are the same as those of the metal structural member of embodiment 2. In the method for manufacturing a metal structural member of this embodiment, in step S5, the second coating 42 is a transparent paint, the material for spraying the first coating 41 is a transparent UV paint, and other manufacturing methods are the same as those of embodiment 2.
The metal structural member of the present embodiment has the same technical effects as those of embodiment 2 except that the CMF effect exhibited is different from that of embodiment 2.
Example 7
Compared to embodiment 1, in the metal structural member of this embodiment, the first coating 41 is a transparent PU coating, and other technical features are the same as those of the metal structural member of embodiment 1. In the method for manufacturing a metal structural member in this embodiment, in step S5, a transparent PU paint is used as a material for paint spraying, the curing temperature after paint spraying is 80 ℃ and the curing time is 30min, and other manufacturing methods are the same as those in embodiment 1.
The metal structural member of the present embodiment has the same technical effects as those of embodiment 1 except that the CMF effect exhibited is different from that of embodiment 1.
Example 8
In comparison with embodiment 1, in the metal structural member of this embodiment, the oxide layer 2 is a colored oxide layer, the electrophoretic layer 3 is a transparent electrophoretic layer, the first coating 41 is a transparent UV coating, and other technical features are the same as those of the metal structural member of embodiment 1. In the method for preparing a metal structural member of this embodiment, in step S2, coloring salt is added to the oxidizing solution in the method for preparing the oxide layer 2, in step S4, a paste containing epoxy resin or acrylic resin is added to the electrophoretic solution for electrophoretic coating, no color paste having color is added to the paste, in step S5, a transparent UV paint is used as a material for paint spraying, and other preparation methods are the same as those of embodiment 1.
The metal structural member of the present embodiment has the same technical effects as those of embodiment 1 except that the CMF effect exhibited is different from that of embodiment 1.
Example 9
Compared with embodiment 2, in the metal structural member of this embodiment, the oxide layer 2 is a colored oxide layer, the electrophoretic layer 3 is a transparent electrophoretic layer, the second coating 42 is a transparent coating, the first coating 41 is a transparent UV coating, and other technical features are the same as those of the metal structural member of embodiment 2. In the method for preparing a metal structural member of this embodiment, in step S2, coloring salt is added to the oxidizing solution in the method for preparing the oxide layer 2, in step S4, a paste containing epoxy resin or acrylic resin is added to the electrophoretic solution for electrophoretic coating, no color paste having color is added to the paste, in step S5, a transparent paint is used for the second coating 42, a transparent UV paint is used as a material for paint spraying for the first coating 41, and other preparation methods are the same as those of embodiment 2.
The metal structural member of the present embodiment has the same technical effects as those of embodiment 2 except that the CMF effect exhibited is different from that of embodiment 2.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (11)
1. The preparation method of the metal structural member is characterized by comprising the following steps of:
providing a substrate;
performing micro-arc oxidation treatment on the surface of the base material to form an oxide layer;
performing electrophoretic coating on the oxide layer to form an electrophoretic layer;
and spraying paint on the electrophoresis layer to form a coating.
2. The method of manufacture of claim 1, wherein the method of manufacture meets at least one of the following characteristics:
(1) The oxide layer is a non-coloring oxide layer or a coloring oxide layer;
(2) The electrophoresis layer is a transparent electrophoresis layer or a coloring electrophoresis layer;
(3) The coating is a transparent coating or a colored coating.
3. The method of manufacturing of claim 1, wherein the substrate meets at least one of the following characteristics:
(1) The base material is selected from one of magnesium AZ31 rolled plate, magnesium AZ31 extruded plate, magnesium AZ91 rolled plate, magnesium AZ91 extruded plate, aluminum 5 plate, aluminum 6 plate or aluminum 7 plate;
(2) The thickness of the base material is 0.6 mm-1.2 mm.
4. The method of claim 1, wherein the micro-arc oxidation of the surface of the substrate to form an oxide layer meets at least one of the following characteristics:
(1) The brightness L value of the oxide layer is 70-90;
(2) The thickness of the oxide layer is 4-12 mu m;
(3) The conditions of the micro-arc oxidation treatment comprise: the oxidizing solution comprises sodium silicate, potassium hydroxide and potassium fluoride; taking the base material as an anode, stainless steel as a cathode, and setting the working maximum voltage to be 350V;
(4) In the oxidation solution, the mass concentration of sodium silicate is 5g/L-7g/L, the mass concentration of potassium hydroxide is 10g/L-12g/L, and the mass concentration of potassium fluoride is 7g/L-9g/L.
5. The method of manufacturing of claim 1, wherein the performing an electrocoating on the oxide layer to form an electrophoretic layer satisfies at least one of the following characteristics:
(1) The thickness of the electrophoresis layer is 10-20 mu m;
(2) The electrophoresis coating adopts anode electrophoresis coating or cathode electrophoresis coating;
(3) The conditions of the electrophoretic coating are as follows: the working voltage is 30V-120V, the curing temperature is 120-180 ℃, and the time is more than 0 and less than or equal to 2min.
6. The method of manufacturing as claimed in claim 1, further comprising the steps of:
before the electrophoretic coating is carried out on the oxide layer, the base material with the oxide layer is required to be cleaned by ultrasonic waves; the ultrasonic cleaning time is 7min-10min.
7. The method of claim 1, wherein said painting the electrophoretic layer to form a coating layer comprises the steps of: and spraying paint on the electrophoresis layer to form a first coating.
8. The method of manufacturing of claim 7, wherein the first coating meets at least one of the following characteristics:
(1) The first coating is a transparent coating or a coloring coating;
(2) The thickness of the first coating is 15-30 mu m;
(3) The material of the first coating is selected from PU or UV.
9. The method of preparing as claimed in claim 7, wherein said painting the electrophoretic layer to form a coating layer further comprises the steps of: and spraying paint on the electrophoresis layer to form a second coating, and spraying paint on the second coating to form the first coating.
10. The method of claim 9, wherein the second coating has a thickness of 5 μm to 10 μm.
11. The metal structural member is characterized by comprising a substrate, and an oxide layer, an electrophoresis layer and a coating layer which are formed on the surface of the substrate and are sequentially arranged in a direction away from the substrate.
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