CN109957758B

CN109957758B - Colorful aluminum product and preparation method thereof, mobile phone middle frame and mobile phone shell

Info

Publication number: CN109957758B
Application number: CN201711415366.5A
Authority: CN
Inventors: 赵长涛; 吴金龙; 王继厚
Original assignee: Huizhou BYD Electronic Co Ltd
Current assignee: Huizhou BYD Electronic Co Ltd
Priority date: 2017-12-25
Filing date: 2017-12-25
Publication date: 2021-09-17
Anticipated expiration: 2037-12-25
Also published as: CN109957758A

Abstract

The invention discloses a colorful aluminum product and a preparation method thereof, a mobile phone middle frame and a mobile phone shell. The coating layer comprises a first Ti layer sequentially coated on the surface of the colored paint layer₃O₅Layer, first SiO₂Layer, second Ti₃O₅Layer, second SiO₂Layer, third Ti₃O₅And (3) a layer. The first Ti₃O₅The thickness of the layer is 30-150nm, the first SiO₂The thickness of the layer is 80-200nm, the second Ti₃O₅The thickness of the layer is 80-180nm, the second SiO₂The thickness of the layer is 100-₃O₅The thickness of the layer is 30-200 nm. The aluminum product can realize the colorful effect of various colors at the same angle, and the stability of the decorative film layer is good.

Description

Colorful aluminum product and preparation method thereof, mobile phone middle frame and mobile phone shell

Technical Field

The invention relates to the technical field of aluminum product surface decoration, in particular to a colorful aluminum product and a preparation method thereof, a mobile phone middle frame and a mobile phone shell.

Background

The existing middle frame material and the mobile phone shell material of the mobile phone are mostly aluminum materials, and as appearance pieces, the existing aluminum products are mostly single color, and the research on the aluminum products with colorful effects is less.

The patent with the application number of CN201511028728.6 discloses a lampshade capable of filtering blue light, sterilizing and increasing the transmittance and a manufacturing method thereof, wherein the lampshade comprises a substrate, and a first film layer, a second film layer, a third film layer, a fourth film layer, a fifth film layer, a sixth film layer, a seventh film layer, an eighth film layer and a ninth film layer are sequentially arranged on the outer surface of the substrate from inside to outside; the first film layer, the fourth film layer and the sixth film layer are all three titanium pentoxide layers, and the thicknesses of the first film layer, the fourth film layer and the sixth film layer are 10-100 nm; the second film layer, the fifth film layer and the seventh film layer are all silicon dioxide layers, and the thickness of the second film layer, the fifth film layer and the seventh film layer is 50-100 nm; the third film layer is a metal layer and is 5-20n thick; the eighth film layer is a nano silver layer, and the thickness of the eighth film layer is 5-20 nm; the ninth film layer is an acrylic acid layer and has a thickness of 5-15 nm. The lampshade can filter harmful blue light and dazzle light, can improve permeability, and also has bactericidal performance. The above patent schemes do not address the research on the glare effect.

The patent with the application number of CN201310563930.3 discloses an aluminum alloy product, which comprises an aluminum alloy part, wherein the surface of the aluminum alloy part is provided with coating films and plated films with different colors to form dazzling colors; wherein the coating film is covered and arranged above the coating film, and the color of the coating film is different from that of the aluminum alloy part. The coating film is 0.01-5 μm. The coating mode is as follows: performing secondary coloring treatment by vacuum plating to form a plating film on the coating film; according to the requirement, the colorful decorative film can be plated, or the colorful decorative film can be plated with an aluminum film, and then various colors can be dyed, or other vacuum electroplating coloring treatment modes can be selected. And controlling the color meeting the requirement by controlling relevant parameters in the film coating process. Above-mentioned patent reaches through the spraying and electroplates the rete of different colours and dazzles various effect, however this kind dazzles various effect and can only reach the seven various effects of "fixed observation angle corresponds fixed colour", and can not really realize "realizing the various colour of same angle" dazzling various effect.

Patent application No. CN201480079866.4 discloses a method of manufacturing a multilayer coating, comprising: providing a substrate having an electrically conductive surface, said substrate being optionally aluminum; electrophoretically depositing a first layer comprised of a first material on at least a portion of the conductive surface of the substrate; depositing a second layer comprised of a second material on at least a portion of the first layer using physical vapor deposition, wherein the second material is electrically conductive; and electrophoretically depositing a third layer of a third material over at least a portion of the second layer. The second material is selected to be a metal material because the second material is electrically conductive. The aluminum product of the above patent is mainly used for the housing of the computer equipment, and the color of the aluminum product is still a single color, so the above patent does not research on the aluminum product with a dazzling color effect.

The patent with the application number of CN201621128832.2 discloses a sheet with a golden and micro-dazzling effect, which comprises a transparent substrate (namely glass) with lines on one surface, a first dielectric layer with the thickness of 0.5-7.5nm, a second dielectric layer with the thickness of 0.5-10nm, an absorption layer with the thickness of 20-50nm and a third dielectric layer with the thickness of 43-95nm, wherein the first dielectric layer, the second dielectric layer, the absorption layer and the third dielectric layer are sequentially plated on the line surface of the substrate; the lines are obtained by ultraviolet curing of UV resin; the first dielectric layer is a silicon dioxide layer, the coating materials of the second dielectric layer and the third dielectric layer are the same and are one of titanium pentoxide and niobium pentoxide, and the absorption layer is an indium layer. In the above patent, since the substrate is glass, the coating layer is disposed on the reverse side of the glass, i.e., on the side not in direct contact with the user, so that the thickness of the coating layer is small, the strength of the coating layer is low, and the bonding force between the coating layer and the substrate is also low, and thus it is not suitable to apply the coating layer directly on the surface of the aluminum substrate (the side in contact with the user).

To sum up, the aluminum product which can realize the colorful effect of multiple colors at the same angle and has good stability of the decorative film layer is needed.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, the invention aims to provide a colorful aluminum product which can realize colorful effects of multiple colors at the same angle and has a good stability of a decorative film layer. Another object of the invention is also to propose a method for the production of said aluminium article. Still another object of the present invention is to provide a middle frame and a casing of a mobile phone.

In order to achieve the purpose, the invention discloses a colorful aluminum product, which comprises a substrate and a decorative film layer arranged on the surface of the substrate, wherein the decorative film layer comprises a colored paint layer and a coating layer which are sequentially arranged on the surface of the substrate;

the coating layer comprises a first Ti layer sequentially coated on the surface of the colored paint layer₃O₅Layer, first SiO₂Layer, second Ti₃O₅Layer, second SiO₂Layer, third Ti₃O₅A layer;

the thickness of the first Ti3O5 layer is 30-150nm, the thickness of the first SiO2 layer is 80-200nm, the thickness of the second Ti3O5 layer is 80-180nm, the thickness of the second SiO2 layer is 100-200nm, and the thickness of the third Ti3O5 layer is 30-200 nm. The total thickness of the coating layer is preferably 500-600 nm.

Preferably, the surface of the colored paint layer provided with the coating layer has a surface roughness of 0.4-0.5 μm.

Preferably, the substrate material is pure aluminum or an aluminum alloy.

The first Ti₃Layer O5, second T_i3O₅Layer, third Ti₃O₅The refractive indices of the layers are 2.1-2.3, respectively; the first SiO₂Layer and second SiO₂The refractive indices of the layers are 1.4-1.55, respectively.

Preferably, the color paint layer is an electrophoretic layer or a sprayed layer. The color paint layer is an electrophoresis layer, and the thickness of the electrophoresis layer is 20-25 mu m. The color paint layer is a spraying layer, and the thickness of the spraying layer is 50-75 mu m.

The aluminum product disclosed by the invention has the following beneficial effects:

1. the colorful effect of dazzling of multiple colours of same angle has been realized to the setting of decorating the rete. Wherein the color paint layer provides a base color for the aluminum article. The coating layers are alternately coated Ti with high refractive index₃O₅Layer (first Ti)₃Layer O5, second T_i3O₅Layer, third Ti₃O₅Layer) and SiO with a low refractive index₂Layer (first SiO)₂Layer and second SiO₂Layer), this kind of coating film layer strengthens or weakens the reverberation through the interference effect of light, is one of the condition that realizes dazzling various effect, and in addition, reasonable setting decorates rete order, rete number of piles, rete thickness of rete and also is another requisite condition that realizes dazzling various effect.

2. The stability of the film layer is improved, and the binding force between the film layers is improved. In order to improve the stability of the decorative film layer, the inventor researches and discovers that when the surface roughness of the surface, provided with the coating layer, of the colored paint layer is controlled to be 0.4-0.5 mu m, the colorful effect can be realized, and the binding force between the colored paint layer and the decorative layer can be improved to a certain degree, so that the stability of the film layer is improved. In addition, the reasonable setting decorates rete order, rete number of piles, rete thickness of rete and also is favorable to improving rete intensity, improves rete stability.

The invention also discloses a preparation method of the colorful aluminum product, which comprises the following steps:

preparing a colored paint layer: forming a color paint layer on the surface of the substrate;

preparing a coating layer: placing the base material in a vacuum evaporation coating machine, and sequentially coating a first Ti layer on the colored paint layer₃O₅Layer, first SiO₂Layer, second Ti₃O₅Layer, second SiO₂Layer, third Ti₃O₅And (3) a layer.

The invention also discloses a mobile phone middle frame which is made of any one of the aluminum products.

The invention also discloses a mobile phone shell which is made of any one of the aluminum products.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a colorful aluminum product according to the present invention.

Reference numerals:

1. a substrate; 2. decorating the film layer; 3. coating a film layer; 31. first Ti₃O₅A layer; 32. first SiO₂A layer; 33. second Ti₃O₅A layer; 34. second SiO₂A layer; 35. third Ti₃O₅A layer; 4. and a colored paint layer.

Detailed Description

The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

As shown in fig. 1, the invention discloses a colorful aluminum product, which comprises a substrate 1 and a decorative film layer 2 disposed on an outer surface of the substrate 1, wherein the outer surface of the substrate 1 is a surface facing a user, i.e., the decorative film layer 2 is in direct contact with the user. The material of the base material 1 can be selected from aluminum alloy or pure aluminum. The decorative film layer 2 comprises a colored paint layer 4 and a coated film layer 3, the colored paint layer 4 is arranged on the outer surface of the substrate 1, the coated film layer 3 is arranged on the outer surface of the colored paint layer 4, and the coated film layer 3 comprises a first Ti layer sequentially coated on the surface of the colored paint layer 4₃O₅Layer 31, first SiO₂Layer 32, second Ti₃O₅Layer 33, second SiO₂Layer 34, third Ti₃O₅Layer 35. First Ti₃O₅The thickness of layer 31 is 30-150nm, first SiO₂The thickness of the layer 32 is 80-200nm, second Ti₃O₅The thickness of layer 33 is 80-180nm, second SiO₂The thickness of the layer 34 is 100-200nm, the third Ti₃O₅The thickness of layer 35 is 30-200 nm.

In the present invention, the color paint layer 4 is mainly used for providing a base color for the aluminum product, the color paint layer 4 may be an electrophoresis layer prepared by an electrophoresis process, and the color paint layer 4 may also be a spray coating layer prepared by a spray coating process. When the colored paint layer 4 is an electrophoretic layer, the thickness of the electrophoretic layer is 20-25 μm. When the pigmented paint layer 4 is a sprayed layer, the thickness of the sprayed layer is 50-75 μm. The specific thickness of the color paint layer 4 can be set according to specific requirements. The material of the colored paint layer 4 is a colored paint coating which is conventional in the art, the paint can be acrylic resin paint or epoxy resin paint, for example, the paint for electrophoresis can be Japanese clear water ELECOAT electrophoresis paint, and the paint for spraying can be American PPG paint.

The coating layer 3 is one of the conditions for realizing the dazzling effect, and Ti is known by those skilled in the art₃O₅Film layer (i.e. first Ti)₃ O5 layer 31, second T_i3O₅Layer 33, third Ti₃O₅Layer 35) and SiO₂Film layer (i.e. first SiO)₂ Layer 32 and secondSiO₂Layers 34) each have a different refractive index, wherein₂Film layer of Ti₃O₅The film layer has a higher refractive index, and the range of the refractive index is 2.1-2.3; compared with Ti₃O₅Film layer of SiO₂The film layer has a low refractive index in the range of 1.4 to 1.55. The coating layer 3 is formed by alternately coating Ti₃O₅Film layer and SiO₂And the film layer strengthens or weakens the reflected light through the interference effect of the light, so that the dazzling effect of presenting various colors at the same angle is realized.

Of course, it is known to those skilled in the art that the "strengthening or weakening of reflected light by light interference" is a complicated process, which is not only related to the material of the coating layer, but also related to the thickness, sequence and number of layers of the coating layer, and the effect of the coating layer is completely different once a certain parameter is changed, for example, in the prior art, Ti is alternately coated₃O₅Film layer and SiO₂The film layer can also be used for permeability increasing and blue light filtering.

In addition, since the substrate 1 is made of an opaque material (non-glass material), the decorative film layer 2 can be provided only on the outer surface of the substrate 1, and therefore, when the decorative film layer 2 is provided, the stability of the decorative film layer 2 needs to be considered. If the decorative film layer 2 is too thin, the strength of the decorative film layer 2 is too low, and the decorative film layer is easily damaged and falls off; if the decorative film layer 2 is too thick, the coating layer 3 may fall off from the colored paint layer 4 due to insufficient bonding force between the film layers.

In view of the above factors, the inventors of the present invention have made extensive studies and found that when the thickness, the sequence and the number of the film layers of the film coating layer 3 are limited within the range required by the present invention, the aluminum product can exhibit a colorful effect of presenting various colors at the same angle, and the stability of the decorative film layer 2 can be improved. Preferably, the total thickness of the coating layer 3 is 500-600nm, so as to avoid the coating layer 3 from falling off due to the excessively thick thickness of the coating layer 3 and avoid the unobvious dazzling effect due to the excessively thin thickness of the coating layer 3.

Furthermore, the inventors have found that the surface roughness of the outer surface of the pigmented paint layer 4 is also an important factor affecting the glare effect and the stability of the decorative film layer 2. On one hand, the surface of the colored paint layer 4 with the rough surface can be beneficial to improving the binding force of the colored paint layer 4 and the coating layer 3. On the other hand, the surface roughness and the glossiness of the colored paint layer 4 are two closely related parameters, and the glossiness of the colored paint layer 4 directly affects the dazzling effect. In view of the above, the inventors have conducted extensive studies and found that the surface of the colored paint layer 4 on which the plating layer 3 is provided (i.e., the outer surface) preferably has a surface roughness of 0.4 to 0.5 μm. When the surface roughness of the colored paint layer 4 is higher than the above range, the glossiness of the colored paint layer 4 is too high, so that the color of the substrate is too thick, and the dazzling effect is not ideal; when the surface roughness of the colored paint layer 4 is lower than the above range, the glossiness of the colored paint layer 4 is too low, so that the color of the substrate is too light, and the dazzling effect is also not ideal, and in addition, the binding force between the coating layer 3 and the colored paint layer 4 is also reduced due to too low surface roughness of the colored paint layer 4.

The invention also discloses a method for preparing the aluminum product, which comprises the following steps:

sand blasting treatment: the surface of the base material 1 is subjected to sand blasting, specifically, the outer surface of the base material 1 is subjected to sand blasting. This is advantageous for improving the bonding force between the substrate 1 and the pigmented paint layer 4.

Preparing a colored paint layer: a layer of colour paint 4 is formed on the outer surface of the substrate 1 by means of electrophoresis or spraying. The electrophoresis and spraying processes are well known to those skilled in the art, and the details of the electrophoresis and spraying processes are not described herein.

Roughening treatment: the outer surface of the colored paint layer 4 is roughened so that the surface roughness of the outer surface of the colored paint layer 4 is 0.4-0.5 μm. The roughening treatment can be performed by a physical method or a chemical method, and the roughening treatment is well known to those skilled in the art, and the manner of the roughening treatment is not limited herein.

Cleaning: the substrate 1 is cleaned to remove stains.

Ion cleaning: putting the cleaned substrate 1 into a vacuum evaporation coating machine, and heatingThe temperature is 40-60 ℃. Before coating the base material 1, firstly carrying out ion bombardment on the base material 1, then vacuumizing and introducing argon, and controlling the vacuum degree to be 4-6.66 multiplied by 10^-3Pa, and simultaneously controlling the anode voltage of 100-120V, the anode current of 4-8A, the cathode current of 4-8A and the filament current of 30-37A, and carrying out ion cleaning on the substrate 1 for 2-10 min. The ion beam bombards the substrate 1, so that the dirt on the surface of the substrate 1 can be splashed and thrown out. By controlling the parameters, the invention can avoid the influence of ion cleaning on the surface roughness of the colored paint layer 4.

Preparing a coating layer: continuously putting the substrate 1 into a vacuum evaporation coating machine, and controlling the vacuum degree to be 1.33-6.66 multiplied by 10^- ³Pa, sequentially plating first Ti on the colored paint layer 4₃O₅Layer 31, first SiO₂Layer 32, second Ti₃O₅Layer 33, second SiO₂Layer 34, third Ti₃O₅Layer 35. In the first Ti plating₃O₅Layer, second Ti₃O₅Layer and third Ti₃O₅When in lamination, the coating rate is controlled to be 1-2A/s; in the first SiO deposition₂Layer and second SiO₂When coating, the coating rate is controlled to be 2-6A/s.

Finally obtaining the colorful aluminum product.

The invention also discloses a mobile phone middle frame which is made of the colorful aluminum product.

The invention also discloses a mobile phone shell which is made of the colorful aluminum product.

The following examples and comparative examples relate to the following test methods.

And (3) testing the hundred-lattice adhesive force:

1) before testing, checking whether the appearance of the aluminum product is abnormal or not, and defects such as color change, bubbles, cracks, falling and the like, and wiping the aluminum product clean by using dust-free cloth;

2) scribing right-angle cross lattices penetrating through the substrate on the decorative film layer to form 10 multiplied by 10 continuous square small lattices of 1mm multiplied by 1 mm;

3) brushing the fragments of the test area with a piece of dust-free cloth, uniformly pulling out a section of NICIBAN CT405AP-24 adhesive tape, removing the foremost section, then cutting off the adhesive tape with a length of about 55mm, placing the center point of the adhesive tape above the grid in a direction parallel to a set of cutting lines, and then flattening the adhesive tape at the position above the grid area with a fingernail to ensure that the adhesive tape is in good contact with the decorative film layer (note that the fingernail does not allow scratching the adhesive tape and the film layer), wherein the length of the adhesive tape at least exceeds 20mm of the grid;

4) sticking an adhesive tape, standing for 90s, holding the suspended end of the adhesive tape, and quickly pulling down the adhesive tape within 0.5-1.0s at an angle as close to 60 degrees as possible;

5) checking the falling conditions of the decorative film layer and the coating film layer, and calculating the falling rate: (number of lattice dropped off the decorative film layer + number of lattice dropped off the plating film)/total lattice number 100%.

Newton's pen test:

a Newton pen (Model: ERICHSEN, Hardness Test Pencil Model 318) is adopted, a proper spring is selected, the Newton pen is vertically placed on the surface of the aluminum product, is pressed downwards and draws 3 lines of 5mm on the surface at the speed of 5 mm/second, the surface of the aluminum product is lightly wiped by dust-free cloth, and then the surface of the aluminum product is observed under a 200-time metallographic microscope. And observing whether the surface of the aluminum product is scratched under the stress of 1N, 2N, 3N and 4N.

Measurement of surface roughness and gloss:

during the roughening treatment, the surface roughness of the color paint layer was measured using a TAYLOR HOBSON25 roughness meter to adjust the surface roughness of the color paint layer. The gloss of the surface of the pigmented layer can be measured by means of an A-4460 gloss meter.

Example 1

Firstly, selecting an aluminum alloy substrate, and carrying out sand blasting treatment and electrophoresis treatment on the surface of the substrate. The outer surface of the colored paint layer was then roughened so that its surface roughness was 0.47. mu.m. And cleaning the base material, and then putting the base material into a vacuum evaporation coating machine. Then, the temperature was heated to 40 ℃ and the degree of vacuum was controlled to 6.66X 10^-3Pa, and simultaneously controlling the anode voltage 110V, the anode current 7A, the cathode current 7A and the filament current 34A to carry out ion cleaning on the base material. Finally, the degree of vacuum was controlled to 4X 10^-5Pa, plating a first Ti₃O₅Layer, second Ti₃O₅Layer and third Ti₃O₅Controlling the coating rate to be 1A/s; plating first SiO₂Layer and second SiO₂When the film is coated, the coating rate is controlled at 6A/s. Finally, an aluminum product A1 is obtained.

Wherein the first Ti₃O₅Layer, first SiO₂Layer, second Ti₃O₅Layer, second SiO₂Layer, third Ti₃O₅The thicknesses of the layers are referred to in table 1.

Example 2

Firstly, selecting an aluminum alloy substrate, and carrying out sand blasting treatment and electrophoresis treatment on the surface of the substrate. The outer surface of the colored paint layer was then roughened so that its surface roughness was 0.4 μm. And cleaning the base material, and then putting the base material into a vacuum evaporation coating machine. Then, the temperature was heated to 45 ℃ and the degree of vacuum was controlled to 5X 10^-3Pa, and simultaneously controlling the anode voltage of 100V, the anode current of 5A, the cathode current of 5A and the filament current of 31A to carry out ion cleaning on the base material. Finally, the vacuum degree was controlled to 5X 10^-3Pa, plating first Ti₃O₅Layer, second Ti₃O₅Layer and third Ti₃O₅Controlling the coating rate to be 2A/s; plating first SiO₂Layer and second SiO₂When the film is coated, the coating rate is controlled to be 4A/s. Finally, an aluminum product A2 is obtained.

Example 3

Firstly, selecting an aluminum alloy substrate, and carrying out sand blasting treatment and electrophoresis treatment on the surface of the substrate. The outer surface of the colored paint layer was then roughened so that its surface roughness was 0.5 μm. And cleaning the base material, and then putting the base material into a vacuum evaporation coating machine. Then, the temperature was heated to 55 ℃ and the degree of vacuum was controlled to 4X 10^-3Pa, and also controlling the anode voltage to 120V, the anode current to 4A and the cathode current to 4A, and the lampFilament current 37A, the substrate was ion cleaned. Finally, the degree of vacuum was controlled to 2X 10^-3Pa, plating first Ti₃O₅Layer, second Ti₃O₅Layer and third Ti₃O₅Controlling the coating rate to be 1A/s; plating first SiO₂Layer and second SiO₂When the film is coated, the coating rate is controlled to be 3A/s. Finally, an aluminum product A3 is obtained.

Example 4

An aluminum article a4 was prepared according to the method of example 2, except that the roughening step was performed to set the surface roughness of the outer surface of the pigmented paint layer as set forth in table 1.

Example 5

An aluminum article a5 was prepared according to the method of example 3, except that the roughening step was performed to set the surface roughness of the outer surface of the pigmented paint layer as set forth in table 1.

Example 6

An aluminum article A6 was prepared according to the method of example 1, except that the first Ti was set as set forth in Table 1₃O₅Layer, first SiO₂Layer, second Ti₃O₅Layer, second SiO₂Layer, third Ti₃O₅The thickness of the layer.

Example 7

An aluminum article A7 was prepared according to the method of example 1, except that the first Ti was set as set forth in Table 1₃O₅Layer, first SiO₂Layer, second Ti₃O₅Layer, second SiO₂Layer, third Ti₃O₅The thickness of the layer.

Comparative example 1

Aluminum article D1 was prepared according to the method of example 1, except that aluminum article D1 lacked the first Ti₃O₅And (3) a layer.

Comparative example 2

According toAn aluminum article D2 was prepared by the method of example 2, except that the first Ti was set as set forth in Table 1₃O₅Layer, first SiO₂Layer, second Ti₃O₅Layer, second SiO₂Layer, third Ti₃O₅The thickness of the layer.

Comparative example 3

An aluminum article D3 was prepared according to the method of example 2, except that the first Ti was set as set forth in Table 1₃O₅Layer, first SiO₂Layer, second Ti₃O₅Layer, second SiO₂Layer, third Ti₃O₅The thickness of the layer.

Comparative example 4

An aluminum article D4 was prepared according to the method of example 2, except that third Ti₃O₅The thickness of the layer was 300 nm.

Comparative example 5

An aluminum article D5 was prepared according to the method of example 2, except that third Ti₃O₅The thickness of the layer was 20 nm.

TABLE 1

The aluminum products A1-A7 and the aluminum products D1-D5 were subjected to a Baige adhesion test and a Newton pen test, and the surfaces of the aluminum products A1-A7 and the aluminum products D1-D5 were observed for a glittering effect. The above test data and observations are recorded in table 2.

TABLE 2

As can be seen from the results in table 2, the colorful aluminum product is obtained by reasonably setting the film material, the film sequence, the number of layers and the thickness of the decorative film layer. This aluminum product had both guaranteed better decoration rete stability, had realized dazzling various effect of same angle multiple colour again.

Comparing examples 1-3 with examples 4 and 3, it can be seen that when the surface roughness of the outer surface of the colored paint layer is controlled to be 0.4-0.5 μm, the stability of the decorative film layer can be better ensured, and the colorful effect is more obvious.

Comparing the embodiment 1 with the embodiments 5 and 6, it can be seen that when the total thickness of the coating layer is controlled to 500-600, better stability of the decorative film layer and more obvious dazzling effect can be ensured at the same time.

When the layer sequence or the number of the coating layers is not within the range defined by the invention, the aluminum product has no dazzling effect as can be seen by comparing the example 1 with the comparative example 1.

Comparing example 2 with comparative examples 2 to 5, it can be seen that when the thickness of each coating layer is not within the range defined by the present invention, the aluminum product can not ensure both the dazzling effect and the good stability of the decorative film layer.

The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.

Claims

1. A colorful aluminum product is characterized by comprising a substrate and a decorative film layer arranged on the surface of the substrate, wherein the decorative film layer comprises a colored paint layer and a coating layer which are sequentially arranged on the surface of the substrate; the coating layer comprises a first Ti layer sequentially coated on the surface of the colored paint layer₃O₅Layer, first SiO₂Layer, second Ti₃O₅Layer, second SiO₂Layer, third Ti₃O₅A layer; the first Ti₃O₅The thickness of the layer is 30-150nm, the first SiO₂The thickness of the layer is 80-200nm, the second Ti₃O₅The thickness of the layer is 80-180nm, the second SiO₂The thickness of the layer is 100-₃O₅The thickness of the layer is 30-200 nm; the colored paint layer is provided with a coating filmThe surface roughness of the surface of the layer is 0.4-0.5 μm;

the total thickness of the coating layer is 500-600 nm.

2. The glare aluminum article of claim 1, wherein the substrate material is pure aluminum or an aluminum alloy.

3. The colored aluminum article of claim 1, wherein the first Ti is₃O₅Layer, second Ti₃O₅Layer, third Ti₃O₅The refractive indices of the layers are 2.1-2.3, respectively; the first SiO₂Layer and second SiO₂The refractive indices of the layers are 1.4-1.55, respectively.

4. The colored aluminum article of claim 1, wherein the colored paint layer is an electrophoretic layer or a spray coating layer.

5. The colored aluminum article of claim 4, wherein the colored paint layer is an electrophoretic layer having a thickness of 20-25 μm.

6. The glare aluminum article of claim 4, wherein the colored paint layer is a sprayed layer having a thickness of 50-75 μm.

7. A method of making the sparkling aluminum article of claim 1, comprising the steps of: preparing a colored paint layer: forming a color paint layer on the surface of the substrate; preparing a coating layer: placing the base material in a vacuum evaporation coating machine, and sequentially coating a first Ti layer on the colored paint layer₃O₅Layer, first SiO₂Layer, second Ti₃O₅Layer, second SiO₂Layer, third Ti₃O₅A layer; before preparing the coating layer, the colored paint layer is subjected to roughening treatment, so that the surface roughness of the surface, provided with the coating layer, of the colored paint layer is 0.4-0.5 mu m.

8. The method of claim 7, wherein the substrate is selected from pure aluminum or an aluminum alloy.

9. The method of claim 7, wherein the surface of the substrate is sandblasted prior to the preparation of the pigmented paint layer.

10. The method of claim 7, wherein the substrate provided with the colored paint layer is subjected to ion cleaning before the coating layer is formed, and the ion cleaning step comprises: placing the base material in a vacuum evaporation coating machine, and controlling the vacuum degree to be 4-6.66 multiplied by 10^-3Pa, anode voltage of 100-120V, anode current of 4-8A, cathode current of 4-8A and filament current of 30-37A, and carrying out ion cleaning on the base material for 2-10 min.

11. The method of claim 7, wherein the step of forming the coating layer comprises: controlling the vacuum degree to be 1.33-6.66X 10^-3Pa, plating first Ti₃O₅Layer, second Ti₃O₅Layer and third Ti₃O₅When in lamination, the coating rate is controlled to be 1-2A/s; plating first SiO₂Layer and second SiO₂When coating, the coating rate is controlled to be 2-6A/s.

12. A mobile phone middle frame, characterized in that the mobile phone middle frame is made of the colorful aluminum product as claimed in claims 1-6.

13. A cell phone case made of the colored aluminum article of claims 1-6.