CN108650826B - Sheet material, preparation method thereof, shell and mobile terminal - Google Patents

Sheet material, preparation method thereof, shell and mobile terminal Download PDF

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Publication number
CN108650826B
CN108650826B CN201810598571.8A CN201810598571A CN108650826B CN 108650826 B CN108650826 B CN 108650826B CN 201810598571 A CN201810598571 A CN 201810598571A CN 108650826 B CN108650826 B CN 108650826B
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Prior art keywords
metal
layer
transition layer
substrate
housing
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CN201810598571.8A
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CN108650826A (en
Inventor
黄志勇
杨光明
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0217—Mechanical details of casings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/1601—Process or apparatus
    • C23C18/1633—Process of electroless plating
    • C23C18/1646—Characteristics of the product obtained
    • C23C18/165—Multilayered product
    • C23C18/1653—Two or more layers with at least one layer obtained by electroless plating and one layer obtained by electroplating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/1601—Process or apparatus
    • C23C18/1633—Process of electroless plating
    • C23C18/1689—After-treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/31—Coating with metals
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0217—Mechanical details of casings
    • H05K5/0243—Mechanical details of casings for decorative purposes

Abstract

The invention discloses a plate, a preparation method thereof, a shell and a mobile terminal. The sheet material comprises: a substrate, wherein a convex part is arranged on one side surface of the substrate; the transition layer is arranged on the surface of one side of the substrate with the convex part and covers the area outside the convex part; the metal coating is arranged on one side of the transition layer, which is far away from the base material; wherein, the surface of the metal coating layer far away from one side of the transition layer is flush with the top surface of the bulge. Therefore, the plate is low in cost and good in surface flatness, the transition layer and the metal coating can enable the plate to have metal texture, the hardness, the strength and the corrosion resistance of the plate are improved, a good metal appearance effect is achieved, the mechanical performance is good, and the appearance surface flatness is good.

Description

Sheet material, preparation method thereof, shell and mobile terminal
Technical Field
The invention relates to the field of electronic equipment, in particular to a plate, a preparation method of the plate, a shell and a mobile terminal.
Background
With the upgrading of consumption structures and the improvement of consumption levels, the consumption concept of people is also changed. For example, in the field of mobile terminals, people no longer pay attention to the configuration and performance of mobile terminals, and appearance is becoming an important factor influencing final selection of users. In order to meet the appearance requirements of users on the mobile terminal, manufacturers continuously explore and perfect material selection, modeling structure design and processing technological processes of the mobile terminal shell, and simultaneously combine the properties of the mobile terminal shell, such as strength, hardness and the like, with appearance effects. Namely, the material, structure, color, texture, strength, hardness and other properties of the mobile terminal shell play a decisive role in the appearance effect of the mobile terminal. Specifically, the material of the mobile terminal housing may be plastic, metal, glass, etc., and the corresponding surface treatment process includes spraying, oxidation, coating, etc., whereas the mobile terminal housing with high strength, high hardness and metal appearance becomes a hot spot of current research in consideration of the combination of appearance effect and service performance.
Therefore, the current sheet material, the manufacturing method thereof, the housing and the mobile terminal still need to be improved.
Disclosure of Invention
In one aspect of the invention, a panel is provided. The sheet material comprises: the substrate, there is a bulge on one side of the said substrate; a transition layer which is arranged on the surface of the substrate on the side with the convex part and covers the area outside the convex part; the metal coating is arranged on one side of the transition layer, which is far away from the base material; and the surface of one side of the metal plating layer, which is far away from the transition layer, is flush with the top surface of the bulge.
Therefore, the plate is low in cost and good in surface flatness, the transition layer and the metal coating can enable the plate to have metal texture, and the hardness, strength and corrosion resistance of the plate are improved; when the plate is used for forming a mobile terminal shell, the cost can be remarkably reduced, the shell has a better metal appearance effect, the strength is high, the hardness is high, the scratch resistance and abrasion resistance are good, the corrosion resistance is excellent, and the appearance surface flatness is good.
In another aspect of the invention, a method of making a panel is provided. The method comprises the following steps: providing a base material, wherein a convex part is arranged on one side surface of the base material; forming a transition layer metal on a surface of the substrate on a side having the projection, and removing the transition layer metal covering the projection so as to obtain a transition layer; and forming a metal coating on the basis of the transition layer, and enabling the surface of one side of the metal coating, which is far away from the transition layer, to be flush with the top surface of the bulge.
The sheet material produced by the method may be the sheet material described above, and thus, may have all of the features and advantages of the sheet material described above, and will not be described herein again. In general. The method can simply and conveniently prepare the plate, and has the advantages of simple process, high production efficiency and low cost; the prepared plate has good surface flatness, the transition layer and the metal coating can enable the plate to have metal texture, and the hardness, strength and corrosion resistance of the plate are improved; when the plate is used for forming a mobile terminal shell, the cost can be remarkably reduced, the shell has a better metal appearance effect, the strength is high, the hardness is high, the scratch resistance and abrasion resistance are good, the corrosion resistance is excellent, and the appearance surface flatness is good.
In yet another aspect of the present invention, a housing is presented. The housing includes: a panel as hereinbefore described or a panel as hereinbefore described prepared by the process as hereinbefore described.
Thus, the housing may have all the features and advantages of the housing described above or of a housing prepared by the method described above, which will not be described in detail herein. Generally speaking, the shell is low in cost, has a good metal appearance effect, and is high in strength, high in hardness, good in scratch resistance and abrasion resistance, excellent in corrosion resistance and good in appearance surface flatness.
In yet another aspect of the present invention, a mobile terminal is presented. The mobile terminal comprises the housing as described above.
Thus, the mobile terminal may have all of the features and advantages of the housing described above and will not be described in detail herein. Generally speaking, the mobile terminal has a good metal appearance effect, and the shell of the mobile terminal is low in cost, high in strength, high in hardness, good in scratch resistance and abrasion resistance, excellent in corrosion resistance and good in appearance surface flatness.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic structural view of a panel according to one embodiment of the present invention;
FIG. 2 shows a schematic structural view of a panel according to another embodiment of the invention;
FIG. 3 shows a schematic flow diagram of a method of making a panel according to one embodiment of the invention;
FIG. 4 shows a schematic partial flow diagram of a method of making a panel according to one embodiment of the present invention;
FIG. 5 shows a schematic partial flow diagram of a method of making a panel according to another embodiment of the present invention;
FIG. 6 shows a schematic partial flow diagram of a method of making a panel according to yet another embodiment of the invention;
FIG. 7 shows a schematic partial flow diagram of a method of making a panel according to yet another embodiment of the invention;
FIG. 8 shows a schematic flow diagram of a method of making a panel according to one embodiment of the invention;
FIG. 9 shows a schematic flow diagram of a method of making a panel according to another embodiment of the invention;
FIG. 10 shows a schematic partial flow diagram of a method of making a panel according to one embodiment of the present invention;
FIG. 11 shows a schematic flow diagram of a method of making a panel according to one embodiment of the invention;
fig. 12 shows a schematic configuration diagram of a mobile terminal according to an embodiment of the present invention;
FIG. 13 shows a schematic partial structural view of a housing according to one embodiment of the invention; and
fig. 14 shows a partial structural view of a housing according to another embodiment of the present invention.
Description of reference numerals:
100: a substrate; 200: a transition layer; 210: a first sublayer; 220: a second sublayer; 300: a metal plating layer; 10: a projection; 20: chemical plating metal; 30: nano-plating metal; 1000: a mobile terminal.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In one aspect of the invention, a panel is provided. According to an embodiment of the invention, with reference to fig. 1, the sheet material comprises: a substrate 100, a transition layer 200, and a metal plating layer 300. According to an embodiment of the present invention, the substrate 100 is provided with the convex portion 10 on one side surface. Namely: on one side surface of the substrate 100, a protrusion is formed. According to an embodiment of the present invention, the transition layer 200 is disposed on the surface of the substrate 100 on the side having the projection 10, and covers the region other than the projection 10. According to the embodiment of the invention, the metal plating layer 300 is disposed on the side of the transition layer 200 away from the substrate 100. Wherein, the surface of the metal plating layer 300 on the side away from the transition layer 200 is flush with the top surface (surface C shown in fig. 1) of the protruding portion 10.
Therefore, the plate is low in cost and good in surface flatness, the transition layer and the metal coating can enable the plate to have metal texture, and the hardness, strength and corrosion resistance of the plate are improved; when the plate is used for forming a mobile terminal shell, the cost can be remarkably reduced, the shell has a better metal appearance effect, the strength is high, the hardness is high, the scratch resistance and abrasion resistance are good, the corrosion resistance is excellent, and the appearance surface flatness is good.
For the sake of understanding, the following is a detailed description of the principle of the plate material to achieve the above technical effects:
the inventor finds that the current mobile terminal shell generally has the problems of high cost, poor appearance effect, difficulty in combining preparation cost, appearance effect and strength and the like. The inventor finds that when the shell is made of metal materials, although the shell has high strength and hardness and can achieve the appearance effect of metal texture, the pre-processing process of the metal materials is complex and high in cost; when the shell is prepared by using plastic with strong plasticity, the front processing can adopt mould injection molding, the cost is low, but the surface treatment process of the plastic shell adopts a spraying mode, so that the prepared shell has poor hand feeling and appearance visual effect, a good metal texture effect is difficult to achieve, and the plastic material has low strength, low hardness and poor scratch resistance and abrasion resistance. Although the metal layer can be arranged on the surface of the plastic shell to realize the appearance of metal texture, the metal layer needs to be processed in the antenna area to avoid forming signal shielding in consideration of meeting the antenna communication requirement. Therefore, complex processes such as shielding, etching, antenna slot filling, or post color processing are often required, which increases production cost, prolongs production time, and reduces production efficiency. Therefore, if a mobile terminal housing with better metal texture can be prepared by plastic with strong plasticity, and the mobile terminal housing has the properties of high strength, high hardness and the like at the same time of low cost, the problems can be solved to a great extent, and the market competitiveness of the mobile terminal housing can be greatly improved.
The inventor finds that by arranging the protruding part on one side surface of the substrate, for example, the protruding part is arranged in the area corresponding to the antenna area of the electronic equipment shell, and the surface of the formed metal plating layer is flush with the top surface of the protruding part, so that the plastic shell with better surface flatness and metal appearance texture can be simply obtained. Since the substrate 100 is made of plastic material, the protrusion only needs to change the shape of the injection mold plate, and the complicated processes of shielding, etching and filling and leveling the antenna slot are not needed.
It should be noted that the surface of the metal plating layer 300 on the side away from the transition layer 200 is flush with the top surface of the protruding portion 10, and particularly, under the condition of visual observation, the surface of the metal plating layer 300 on the side away from the transition layer 200 does not have an obvious step with the surface of the top plate of the protruding portion 10, and has a uniform overall surface and good flatness. In some embodiments of the present invention, the sheet may be used to prepare a middle frame or a battery cover plate of a mobile terminal, and the area where the protruding portion is located may be an area where an antenna is located, so that the area where the antenna is located has no transition layer or metal plating layer, and on the premise of not affecting an antenna signal, a height difference between the protruding portion and the transition layer or the metal plating layer may be eliminated, so that the surface flatness of the housing is good; and the formed middle frame or battery cover plate has low cost, better metal appearance effect, high strength, high hardness, good scratch resistance and abrasion resistance and excellent corrosion resistance.
According to the embodiment of the present invention, the height of the protruding part 10 is equal to the total thickness of the transition layer 200 and the metal plating layer 300. As shown in fig. 1, taking the surface of the substrate 100 on the side away from the protruding portion 10 as a plane as an example, the height of the protruding portion 10 disposed on one side of the substrate 100 is a, that is, the height a is equal to the total thickness of the transition layer 200 and the metal plating layer 300. Thus, the sheet eliminates the height difference between the protrusions 10 and the transition layer 200 and the metal plating layer 300, and the surface flatness of the sheet is good. According to the embodiment of the present invention, the height of the protruding part 10 is not particularly limited, and it is sufficient that the total thickness of the transition layer 200 and the metal plating layer 300 is equal to the height of the protruding part 10. For example, according to an embodiment of the present invention, the height of the protrusion 10 may be 20 to 100 μm. In some embodiments of the present invention, the height of the projections 10 may be 20 micrometers, 50 micrometers, 100 micrometers. Therefore, the height difference between the formed transition layer and the metal coating and the convex part can be eliminated, and the surface flatness of the plate is good.
It should be noted that the surface of the substrate 100 on the side away from the convex portion 10 may not be a plane but may have a certain concave-convex structure. At this time, it is only necessary that the total thickness of the transition layer 200 and the metal plating layer 300 is equal to the height of the protrusion 10, and no obvious step or step is observed with naked eyes.
According to an embodiment of the present invention, the substrate 100 may be formed of an insulating material. Therefore, the base material is low in cost and easy to process, and the performance and the appearance effect of the plate can be further improved. According to an embodiment of the present invention, the specific type of the insulating material forming the substrate 100 is not particularly limited, and may be selected by those skilled in the art according to actual needs. According to an embodiment of the present invention, the material forming the substrate 100 includes at least one of Polycarbonate (PC), polyethylene terephthalate (ABS), and a blend of polycarbonate and polyethylene terephthalate (PC-ABS). Therefore, the base material is low in cost, good in plasticity, easy to process and light in weight, and the performance and the appearance effect of the plate can be further improved. According to the embodiment of the present invention, the specific shape of the substrate 100 is not particularly limited, and it suffices that the protruding portion 10 is provided on one side of the substrate 100. According to the embodiment of the present invention, the specific formation position of the protrusions 10 in the substrate 100, the orthographic projection area on the substrate, and the number are not particularly limited, and those skilled in the art can select the position according to actual needs. For example, the substrate 100 may have a plurality of projections 10, and the orthographic projection area of each projection 10 on the substrate 100 is different.
The inventor finds out through a large amount of experiments that although various methods are used for forming the metal layer on the plastic base material, wherein the chemical plating metal formed by chemical plating has better bonding force with the plastic base material and lower cost, the appearance texture of the chemical plating metal formed by chemical plating is poorer. Therefore, the transition layer can be formed on the base material by adopting an electroless plating method, and the bonding force between the subsequent structure and the base material can be further ensured. And the formed transition layer has better conductivity, so that the quality of subsequent electroplating can be improved. The metal plating layer 300 may be formed on the transition layer 200 by electroplating, whereby the structure of the metal plating layer 300 can be easily controlled: the position of the metal plating layer 300 can be adjusted and controlled by adjusting the transition layer 200, that is, the specific position of the electroplated electrode, and the thickness can be more accurately controlled by controlling the electroplating parameters.
Referring to fig. 2, the transition layer 200 may further include: a first sublayer 210 and a second sublayer 220. According to an embodiment of the present invention, the first sub-layer 210 is disposed on the surface of the substrate 100 on the side having the protrusions 10, and covers the region other than the protrusions 10. According to an embodiment of the present invention, the second sublayer 220 is disposed on a side of the first sublayer 210 facing away from the substrate 100. Therefore, the first sub-layer and the second sub-layer can enhance the surface hardness, the strength and the corrosion resistance of the plate, so that the plate has a metal texture.
The manner of forming the first sub-layer 210 according to an embodiment of the present invention is not particularly limited, and may be selected by those skilled in the art according to actual needs. For example, according to an embodiment of the present invention, the first sub-layer 210 may be formed by means of electroless plating. According to an embodiment of the present invention, a material forming the first sub-layer 210 is not particularly limited, and may be selected by one skilled in the art according to actual needs. For example, the material forming the first sublayer 210 may include at least one of nickel, copper, silver, gold, and cobalt. According to a specific embodiment of the present invention, the material forming the first sublayer 210 may be nickel. The thickness of the first sub-layer 210 is not particularly limited and may be selected by one skilled in the art according to actual needs, according to embodiments of the present invention. For example, according to an embodiment of the present invention, the thickness of the first sub-layer 210 may be 2 to 20 μm. In some embodiments of the present invention, the first sub-layer 210 may have a thickness of 2 microns, 2.5 microns, 5 microns, 10 microns, 15 microns, 20 microns. Therefore, the performance and the appearance effect of the plate can be further improved.
The manner of forming the second sublayer 220 according to an embodiment of the present invention is not particularly limited, and may be selected by those skilled in the art according to actual requirements. For example, the second sub-layer 220 may be formed by nano-plating according to an embodiment of the present invention. According to an embodiment of the present invention, the material forming the second sublayer 220 is not particularly limited, and may be selected by one skilled in the art according to actual needs. For example, the material forming the second sublayer 220 may include at least one of nickel, chromium, and zinc. According to a specific embodiment of the present invention, the material forming the second sublayer 220 may be nickel. According to an embodiment of the present invention, the second sublayer 220 is a porous structure having a pore size of less than 10 nm. In some embodiments of the present invention, the pore size of the porous structure in the second sublayer 220 may be 4 nm, 6 nm, 8 nm, 9 nm. The second sublayer may thus make the surface of the shell denser and have better wear and corrosion resistance. According to an embodiment of the present invention, the hardness of the second sublayer 220 is not less than 8H. In some embodiments of the present invention, the hardness of the second sub-layer 220 may be 8H, 9H. Thus, the hardness of the second sub-layer is high, and the surface hardness of the plate can be obviously enhanced. According to the embodiment of the invention, the yield strength of the second sub-layer 220 is 700-1000 MPa. In some embodiments of the present invention, the yield strength of the second sub-layer 220 may be 700MPa, 800MPa, 900MPa, 1000 MPa. Therefore, the surface strength of the second sub-layer is high, and the surface strength of the plate can be obviously enhanced. The thickness of the second sublayer 220 is not particularly limited and may be selected by one skilled in the art according to actual needs, according to embodiments of the present invention. For example, according to an embodiment of the present invention, the thickness of the second sub-layer 220 may be 3 to 20 μm. In some embodiments of the present invention, the second sublayer 220 may have a thickness of 3 microns, 3.5 microns, 5 microns, 10 microns, 15 microns, 20 microns. Therefore, the performance and the appearance effect of the plate can be further improved.
The manner of forming the metal plating layer 300 according to the embodiment of the present invention is not particularly limited, and may be selected by those skilled in the art according to actual needs. For example, according to an embodiment of the present invention, the metal plating layer 300 may be formed by electroplating. According to an embodiment of the present invention, the material forming the metal plating layer 300 is not particularly limited, and may be selected by those skilled in the art according to actual needs. For example, according to an embodiment of the present invention, the material forming the metal plating layer 300 may include at least one of copper, nickel, zinc, cadmium, gold, and silver. Therefore, the surface hardness, strength and corrosion resistance of the plate can be further enhanced, and the surface metallic luster of the plate is further improved. The thickness of the metal plating layer 300 is not particularly limited according to an embodiment of the present invention, and may be selected by those skilled in the art according to actual needs. For example, according to an embodiment of the present invention, the thickness of the metal plating layer 300 may be 15 to 60 μm. In some embodiments of the present invention, the thickness of the metal plating layer 300 may be 15 microns, 20 microns, 30 microns, 40 microns, 50 microns, 60 microns. Therefore, the performance and the appearance effect of the plate can be further improved.
According to an embodiment of the invention, the panel further comprises a paint layer. According to an embodiment of the present invention, the coating layer is disposed on the side of the metal plating layer 300 away from the substrate 100, or the coating layer is disposed on the top surface of the projection 10 and the side of the metal plating layer 300 away from the substrate 100. From this, the dope layer can make the surface color of panel more diversified, is favorable to individualized trend, can further promote the outward appearance effect of panel. According to the embodiment of the invention, the specific manner, material, position and color of forming the coating layer are not particularly limited, and can be selected by those skilled in the art according to actual needs. For example, according to the embodiment of the present invention, a paint layer is formed on the top surface of the protruding portion 10 and the side of the metal plating layer 300 away from the substrate 100 by printing, the formed paint layer is an insulating material, and when the plate is used to form a housing of a mobile terminal and the area where the protruding portion 10 is located is the position where the antenna is located, the paint layer on the top surface of the protruding portion 10 does not affect the antenna signal. Therefore, the surface color of the plate can be diversified, the individuation trend is facilitated, and the appearance effect of the plate can be further improved. According to an embodiment of the present invention, the coating layer may be transparent to some extent. Therefore, the reflected light of the metal structure formed below can be emitted through the coating layer, and the plate with metal texture and certain appearance such as color, texture, pattern and the like is obtained.
Alternatively, according to the embodiment of the present invention, the coating layer may be formed on the side of the metal plating layer 300 away from the substrate 100 by physical vapor deposition, and the material forming the coating layer includes at least one of titanium, tungsten, and chromium. Therefore, the metal texture of the plate can be further improved, the surface color of the plate is diversified, the individuation trend is facilitated, and the appearance effect of the plate can be further improved. According to the embodiment of the present invention, the thickness of the coating layer is not particularly limited, and may be selected by those skilled in the art according to actual needs. For example, according to an embodiment of the present invention, the thickness of the coating layer may be 1 to 20 micrometers. In some embodiments of the invention, the thickness of the coating layer may be 1 micron, 1.5 microns, 5 microns, 10 microns, 15 microns, 20 microns. Therefore, the performance and the appearance effect of the plate can be further improved. It will be appreciated by those skilled in the art that when the paint layer is formed of metal, the paint layer on the top surface of the projection 10 needs to be removed to prevent the formation of a shield that obstructs the transmission of the antenna signal in the area corresponding to the projection 10.
In another aspect of the invention, a method of making a panel is provided. The sheet material produced by the method may be the sheet material described above, and thus, may have all of the features and advantages of the sheet material described above, and will not be described herein again. In general. The method can simply and conveniently prepare the plate, and has the advantages of simple process, high production efficiency and low cost; the prepared plate has good surface flatness, the transition layer and the metal coating can enable the plate to have metal texture, and the hardness, strength and corrosion resistance of the plate are improved; when the plate is used for forming a mobile terminal shell, the cost can be remarkably reduced, the shell has a better metal appearance effect, the strength is high, the hardness is high, the scratch resistance and abrasion resistance are good, the corrosion resistance is excellent, and the appearance surface flatness is good. According to an embodiment of the invention, referring to fig. 3, the method comprises:
s100: providing a substrate
In this step, a protruding portion is provided on one side surface of the base material. According to the embodiment of the present invention, the material and the specific shape of the base material, and the specific forming position, the forward projection area, and the number of the projections provided on one side of the base material have been described in detail above, and will not be described again. In some embodiments of the present invention, the board prepared by the method based on the substrate may be further used to prepare a middle frame or a battery cover plate of a mobile terminal, the area corresponding to the protruding portion may be the area where the antenna is located, and in the subsequent steps of the method, the area where the antenna is located does not form a transition layer or a metal plating layer, so that the height difference between the protruding portion and the metal plating layer can be eliminated on the premise of not affecting the antenna signal, and the surface flatness of the housing is good; and the formed middle frame or battery cover plate has low cost, better metal appearance effect, high strength, high hardness, good scratch resistance and abrasion resistance and excellent corrosion resistance.
S200: forming a transition layer
In this step, a transition layer metal is formed on the surface of the substrate on the side having the projections, and the transition layer metal covering the projections is removed, so that a transition layer is obtained.
According to an embodiment of the present invention, the transition layer finally obtained in this step may include: the first sub-layer is arranged on the surface of the substrate at the side with the protruding part and covers the area except the protruding part, and the second sub-layer is arranged at the side of the first sub-layer far away from the substrate. Therefore, the first sub-layer and the second sub-layer can enhance the surface hardness, the strength and the corrosion resistance of the plate, so that the plate has a metal texture. The materials and thicknesses of the first sub-layer according to the embodiment of the present invention have been described in detail above, and will not be described herein. The formation material, thickness, hardness, yield strength, and pore size of the voids of the second sublayer are described in detail above according to embodiments of the present invention, and will not be described in detail herein.
The specific steps for forming the transition layer will be described in detail below.
In some embodiments of the present invention, referring to fig. 4, the transition layer may be formed by:
s210: formation of transition layer metal
In this step, electroless metal, which is the transition layer metal, is formed on the substrate by electroless plating. Specifically, referring to (a) and (B) in fig. 5, on the surface of the substrate 100 on the side having the projections 10, a uniform layer of electroless plating metal 20 is formed by electroless plating, that is, electroless plating metal 20B is formed on the top surfaces of the projections 10, while electroless plating metal 20A is also formed on the surface of the substrate 100 on the side having the projections 10, on the regions other than the projections 10. The electroless metals 20A and 20B constitute an electroless metal 20, and the electroless metal 20 is a transition layer metal.
According to an embodiment of the present invention, the specific manner of the electroless plating is not particularly limited, and only the electroless plating metal is formed on the surface of the substrate on the side having the convex portion. For example, when the electroless plating metal 20 is formed of nickel, an electroless nickel plating solution can be used to react with a plating member (substrate) at room temperature for 3-8 minutes to deposit a uniform layer of electroless nickel. In some embodiments of the present invention, the electroless nickel plating solution may include a main salt, a reducing agent, and an auxiliary agent, wherein the main salt may be nickel sulfate, the reducing agent may be sodium hypophosphite, and the auxiliary agent may be triethanolamine.
S220: forming a first sub-layer
In this step, the transition layer metal covering the projections is removed by means of a laser etching process in order to obtain a first sublayer. Specifically, referring to (B) and (c) in fig. 5, the electroless plating metal 20B on the top surface of the convex portion 10 is removed by laser etching, that is: the transition layer metal covering the protrusion is removed using a laser etching process to form the first sub-layer 210. According to the embodiment of the invention, the specific parameters of the laser etching process are not particularly limited, and only the chemical plating metal on the convex part 10 needs to be removed. For example, the upper surface of the electroless metal coating 20B on the projections 10 may be laser etched using a laser (laser) beam using a laser etcher to remove the electroless metal coating 20B in this region, so as to obtain the first sublayer 210.
S230: forming a second sub-layer
In this step, a second sublayer is formed by nano-plating based on the transition layer metal, and the first sublayer and the second sublayer constitute the transition layer. Specifically, referring to (c) and (d) of fig. 5, on the side of the first sub-layer 210 away from the substrate 100, a second sub-layer 220 is formed by nano-plating. Therefore, the transition layer can be prepared simply and conveniently, and the performance and appearance effect of the plate prepared by the method are further improved. It should be noted that, since the electroless metal plating 20B on the convex portion 10 has been removed by the laser etching process, the second sub-layer 220 is not formed on the convex portion 10 when the nano plating is used.
According to an embodiment of the present invention, the nano-plating is not particularly limited, and the second sub-layer 220 may be formed on the first sub-layer 210 away from the substrate 100. For example, when the second sub-layer 220 is formed of nickel, a nano nickel plating solution may be used at 50 to 60 degrees Celsius, pH 3 to 5, and a current density 2 to 5A/dm2The plating piece (base material) is treated for 8-15 minutes under the condition of (1) to obtain the required second sub-layer 220. In some embodiments of the present invention, the nano nickel electroplating solution may include nickel sulfate, nickel oxide, boric acid, nano nickel base solution, and an auxiliary agent.
According to further embodiments of the present invention, referring to fig. 6, the transition layer may be formed by:
s10: forming electroless metal
In this step, electroless metal plating is formed on the base material by electroless plating. Specifically, referring to (a) and (B) in fig. 7, on the surface of the substrate 100 on the side having the projections 10, a uniform layer of electroless plating metal 20 is formed by electroless plating, that is, electroless plating metal 20B is formed on the top surfaces of the projections 10, while electroless plating metal 20A is also formed on the surface of the substrate 100 on the side having the projections 10, on the regions other than the projections 10.
According to an embodiment of the present invention, a specific manner of electroless plating may have the same manner as the aforementioned electroless plating, and when the electroless plating metal is formed of nickel, the electroless nickel plating solution used may be the same as the aforementioned electroless nickel plating solution, and will not be described herein again.
S20: formation of nano-metallization
In this step, a nano-plating metal is formed by nano-plating based on the electroless plating metal, and the electroless plating metal and the nano-plating metal constitute a transition layer metal. Specifically, referring to (b) and (c) in fig. 7, on the side of the formed electroless metal plating 20 away from the base material 100, a nanometal 30 is formed by the nano plating. That is, the nano-plating metal 30A is formed on the side of the formed electroless plating metal 20B away from the projection 10, while the nano-plating metal 30B is formed on the side of the formed electroless plating metal 20A away from the substrate 100.
According to an embodiment of the present invention, a specific manner of nano plating may have the same manner as the nano plating described above, and when the nano plating metal is formed of nickel, the nano nickel plating solution used may be the same as the nano nickel plating solution described above, and will not be described herein again.
S30: removing transition layer metal covering the protrusion
In this step, the transition layer metal (including electroless metal and nano metal) covering the projections 10 is removed by laser etching treatment to obtain a transition layer. Specifically, referring to (c) and (d) of fig. 7, the electroless plating metal 20B and the nano-plating metal 30A on the projection 10 are removed by laser etching to form a first sublayer 210 and a second sublayer 220, respectively. Therefore, the transition layer can be prepared simply and conveniently, and the performance and appearance effect of the plate prepared by the method are further improved. Because the stability of the formed nano-plating metal is high, the laser etching treatment is carried out after the nano-plating metal is formed, and the bad phenomena of dirt, touch scratch and the like can not be caused.
According to the embodiment of the present invention, the specific manner of the laser etching process may be the same as the laser etching process described above, and will not be described herein again.
S300: forming a metal coating
In this step, a metal plating layer is formed on the basis of the transition layer, and the surface of the metal plating layer on the side away from the transition layer is made flush with the top surface of the projection. Specifically, referring to fig. 1, on the side of the transition layer 200 away from the substrate 100, a metal plating layer 300 is formed by an electroplating process. Note that, since the transition layer covering the convex portion 10 has been removed by the laser etching process, the metal plating layer 300 is not formed on the convex portion 10 when the electroplating process is used.
According to the embodiment of the invention, the surface of the metal plating layer on the side far away from the transition layer is flush with the top surface of the bulge. Under the condition of visual observation, the surface of one side of the metal coating layer, which is far away from the transition layer, has no obvious step with the top surface of the bulge, and the whole surface is uniform and has good flatness.
According to the embodiment of the invention, when the transition layer and the metal plating layer are formed, the total thickness of the transition layer and the metal plating layer needs to be controlled to be equal to the height of the convex part. Therefore, the height difference between the convex part and the transition layer and between the convex part and the metal coating is eliminated, and the surface flatness of the plate is good.
The thickness and the material of the metal plating layer according to the embodiment of the present invention have been described in detail above, and are not described in detail herein.
In forming the metal plating layer by the electroplating treatment according to the embodiment of the present invention, the specific manner of the electroplating treatment is not particularly limited, and the metal plating layer may be formed only on the side of the transition layer away from the substrate. For example, when the metal plating layer is made of chromium, a chromium plating solution may be used at 30 to 50 degrees centigrade, pH 2 to 4, and current density 8 to 12A/dm2Treating the plated piece (base material) for 2-5 minutes under the condition to obtain the required metal plating layer. In some embodiments of the present invention, the chromium electroplating bath may include chromium chloride, boric acid, and a trivalent chromium carrier. When the metal plating layer is formed by chromium, the appearance effect of the plate can be further improved, so that the plate has silvery white luster, and the metal texture of the plate is further improved.
According to an embodiment of the present invention, in order to further improve the performance and appearance effect of the plate prepared by the method, referring to fig. 8, the method further includes:
s400: forming a coating layer
In this step, a coating layer is formed. The coating layer sets up in the metal coating and keeps away from one side of substrate, perhaps, the coating layer sets up on the top surface of bulge and the metal coating keeps away from one side of substrate. Therefore, the surface color of the plate can be diversified, the individuation trend is facilitated, and the appearance effect of the plate can be further improved.
According to the embodiment of the invention, the specific manner, material, position and color of forming the coating layer are not particularly limited, and can be selected by those skilled in the art according to actual needs. For example, according to the embodiment of the present invention, a paint layer is formed on the top surface of the protruding portion 10 and on the side of the metal plating layer 300 away from the substrate 100 by printing, the formed paint layer is an insulating material, and when the plate is used to form a housing of a mobile terminal and the area corresponding to the protruding portion 10 is the position of the antenna, the paint layer on the protruding portion 10 does not affect the antenna signal. Therefore, the surface color of the plate can be diversified, the individuation trend is facilitated, and the appearance effect of the plate can be further improved. Alternatively, according to the embodiment of the present invention, the coating layer may be formed on the side of the metal plating layer 300 away from the substrate 100 by means of physical vapor deposition, and the material forming the coating layer includes at least one of titanium, tungsten, and chromium. Therefore, the metal texture of the plate can be further improved, the surface color of the plate is diversified, the individuation trend is facilitated, and the appearance effect of the plate can be further improved. It should be noted that, when a paint layer is formed by Physical Vapor Deposition (PVD), a PVD material formed on the protrusion 10 may be removed by laser etching, so that when the mobile terminal housing is prepared from the plate (where an area corresponding to the protrusion is an area where the antenna is located), signals of the antenna are prevented from being affected. After PVD materials are removed from the convex parts through laser etching, the areas can be dyed, and therefore the plate can have more uniform colors. The thickness of the coating layer according to the embodiment of the present invention has been described in detail above, and will not be described herein again.
According to an embodiment of the present invention, in order to further improve the performance and appearance effect of the plate prepared by the method, referring to fig. 9, before forming the transition layer, the method may further include:
s500: pretreatment of
According to an embodiment of the invention, in this step, the substrate is pretreated. Referring to fig. 10, the preprocessing includes, according to an embodiment of the present invention:
s1: degreasing treatment and degreasing treatment
In this step, the base material is subjected to degreasing treatment and degreasing treatment in this order. According to the embodiment of the present invention, the specific manner of the degreasing treatment and the degreasing treatment is not particularly limited. For example, the degreasing treatment and the degreasing treatment may be performed by immersing the substrate with a degreasing liquid at a certain temperature, and then performing surface cleaning water washing. Therefore, the oil removal and degreasing can ensure that the surface of the substrate is clean and free of oil stains, thereby being beneficial to uniform coarsening of the surface of the substrate.
S2: surface roughening treatment
In this step, the degreased substrate is subjected to surface roughening treatment. According to embodiments of the present invention, the specific manner of the surface roughening treatment is not particularly limited. For example, the substrate may be roughened by immersing the substrate in a roughening solution, wherein the roughening solution may be chromic acid, and the roughening temperature may be 60 to 70 ℃. Therefore, the coarsening can enable the surface of the base material to form a micropore shape so as to ensure that the surface of the base material forms proper roughness and further ensure that a transition layer formed subsequently has good bonding force with the base material.
S3: neutralizing job processing
In this step, the base material subjected to the surface roughening treatment is subjected to a neutralization operation. According to the embodiment of the present invention, the specific manner of the neutralization job processing is not particularly limited. For example, the neutralization treatment may be performed using an acid solution, and the neutralization temperature may be room temperature. Thus, the neutralizing operation can remove the roughening solution remaining on the surface of the substrate.
S3: activation treatment
In this step, the substrate subjected to the neutralization operation is subjected to an activation treatment. According to the embodiment of the present invention, the specific manner of the activation treatment is not particularly limited. For example, the substrate may be first immersed in a pre-immersion liquid (e.g., a mixed solution of stannous sulfate and hydrochloric acid) to remove a portion of impurities on the substrate, and then immersed in an activation liquid (e.g., a mixed solution of palladium chloride, hydrochloric acid, and stannous sulfate), wherein the temperature of the activation liquid may be 35-45 ℃. Therefore, the activation treatment can enable the surface of the microporous base material after coarsening to uniformly adsorb the activating agent colloid, and provide a catalytic carrier for subsequent chemical plating.
According to an embodiment of the present invention, in order to further improve the performance and appearance effect of the plate prepared by the method, referring to fig. 11, the method further includes:
s600: dispergation treatment
According to the embodiment of the invention, after the pretreatment is carried out and before the transition layer is formed, the substrate is subjected to dispergation treatment. The core of the colloid adsorbed on the surface of the substrate is metallic palladium, and the periphery of the colloid is a particle group of divalent tin, so that divalent tin is easily hydrolyzed into a colloid during water washing, palladium is wrapped in the colloid, and the catalytic action of palladium cannot be embodied, therefore, the divalent tin in the pre-soaking salt remained on the surface of the colloid group can be removed by performing dispergation treatment, and the palladium of the activating agent is exposed to be a catalytic active point of a first sub-layer formed by subsequent chemical plating. According to the embodiment of the present invention, the specific manner of the dispergation treatment is not particularly limited. For example, the dispergation treatment can be performed by using a hydrochloric acid aqueous solution, and the dispergation temperature can be 35-45 ℃.
According to an embodiment of the present invention, after each of the above steps, the method may further include a step of washing with water to remove the solution remaining on the surface of the substrate, wherein water used for the washing with water includes at least one of deionized water, distilled water, and purified water.
In yet another aspect of the present invention, a housing is presented. The housing includes: a panel as hereinbefore described or a panel as hereinbefore described prepared by the process as hereinbefore described. Thus, the housing may have all the features and advantages of the housing described above or of a housing prepared by the method described above, which will not be described in detail herein. Generally speaking, the shell is low in cost, has a good metal appearance effect, and is high in strength, high in hardness, good in scratch resistance and abrasion resistance, excellent in corrosion resistance and good in appearance surface flatness.
In yet another aspect of the present invention, a mobile terminal is presented. Referring to fig. 12, a mobile terminal 1000 includes the housing as previously described in accordance with an embodiment of the present invention. Thus, all the features and advantages of the housing described above can be achieved, and are not described in detail herein. Generally speaking, the mobile terminal has a good metal appearance effect, and the shell of the mobile terminal is low in cost, high in strength, high in hardness, good in scratch resistance and abrasion resistance, excellent in corrosion resistance and good in appearance surface flatness.
According to an embodiment of the present invention, the mobile terminal 1000 further includes an antenna (not shown in the figure). The antenna is arranged at the position corresponding to the bulge of the shell. Because no transition layer and metal coating are formed on the bulge, the signal of the antenna can not be influenced, and the bulge eliminates the height difference between the bulge and the transition layer and the metal coating on the premise of not influencing the signal of the antenna, so that the surface flatness of the shell is good.
The housing in the mobile terminal 1000 may be a center frame or a battery cover plate according to an embodiment of the present invention. Therefore, the performance and the appearance effect of the mobile terminal can be further improved. According to the embodiment of the invention, the area corresponding to the protruding part of the housing can be the position of the antenna. Therefore, on the premise of not influencing the antenna signal, the shell can eliminate the height difference between the convex part and the transition layer and between the convex part and the metal coating, so that the surface of the shell is good in flatness. According to a specific embodiment of the present invention, when the middle frame or the battery cover plate is further prepared based on the above plate or the plate prepared by the above method, the substrate may be subjected to a molding treatment to form a middle frame substrate or a battery cover plate substrate, and then the steps of the pretreatment, the dispergation treatment, the formation of the transition layer, the metal plating layer, the formation of the coating layer, and the like are sequentially performed to finally form the middle frame or the battery cover plate. The forming treatment can be injection molding and integral forming of the base material to obtain a required middle frame structure or a required battery cover plate structure. Specifically, referring to fig. 13, the center substrate is formed by integral injection molding, D, E, F, G in fig. 13 is a protrusion, an area corresponding to the protrusion is an area where the antenna is located, the height of the protrusion is equal to the total thickness of the transition layer and the metal plating layer formed in the subsequent steps, so that the height difference between the protrusion and the transition layer and the metal plating layer is eliminated, and the protrusion does not form the transition layer and the metal plating layer, so that the antenna signal is not affected, and the surface flatness of the housing is good. Or, referring to fig. 14, the battery cover plate substrate is formed by integral injection molding, H in fig. 14 is a protruding portion, a region corresponding to the protruding portion is a region where the antenna is located, the height of the protruding portion is equal to the total thickness of the transition layer and the metal plating layer formed in the subsequent steps, so that the height difference between the protruding portion and the transition layer and between the protruding portion and the metal plating layer is eliminated, and the protruding portion is not provided with the transition layer and the metal plating layer, so that the antenna signal is not affected, and the surface flatness of the housing is good.
In the description of the present invention, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description herein, references to the description of "one embodiment," "another embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. In addition, it should be noted that the terms "first" and "second" in this specification are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (18)

1. A housing, comprising:
a sheet material for forming a housing of a mobile terminal, the sheet material comprising:
the base material is made of plastic materials, and a protruding part is arranged on one side surface of the base material;
a transition layer provided on a surface of the base material on a side having the convex portion and covering a region other than the convex portion, the transition layer including:
a first sublayer provided on a surface of the base material on a side having the projecting part and covering a region other than the projecting part;
a second sublayer disposed on a side of the first sublayer distal from the substrate, the second sublayer being porous;
the metal coating is arranged on one side of the transition layer, which is far away from the base material;
wherein the content of the first and second substances,
the surface of one side of the metal coating, which is far away from the transition layer, is flush with the top surface of the bulge.
2. The housing of claim 1, wherein the height of the protrusion is equal to the total thickness of the transition layer and the metal plating layer.
3. The housing of claim 1, wherein a material forming the first sublayer comprises at least one of nickel, copper, silver, gold, and cobalt.
4. The housing of claim 1, wherein a material forming the second sublayer comprises at least one of nickel, chromium, and zinc.
5. The housing of claim 1, wherein the height of the protrusion is 20-100 μm.
6. The housing of claim 1, wherein the pore size of the porous structure is less than 10 nanometers.
7. The casing of claim 1, wherein the hardness of the second sublayer is not less than 8H.
8. The shell of claim 1, wherein the second sub-layer has a yield strength of 700 to 1000 MPa.
9. The housing of claim 1, wherein the substrate is formed of an insulating material.
10. The housing of claim 1, wherein a material forming the metal plating includes at least one of copper, nickel, zinc, cadmium, gold, and silver.
11. The housing of claim 1, further comprising:
the dope layer, the dope layer sets up the metallic coating keeps away from one side of substrate, perhaps, the dope layer sets up on the bulge the top surface and the metallic coating keeps away from one side of substrate.
12. A method of making a housing, comprising:
the sheet material is used for forming a shell of the mobile terminal, and the sheet material preparation method comprises the following steps:
providing a base material, wherein a convex part is arranged on one side surface of the base material;
forming a transition layer metal on the surface of the substrate on the side having the convex part by electroless plating, and removing the transition layer metal covering the convex part to obtain a transition layer;
and forming a metal coating on the basis of the transition layer, and enabling the surface of one side of the metal coating, which is far away from the transition layer, to be flush with the top surface of the bulge.
13. The method of claim 12, further comprising:
controlling the total thickness of the transition layer and the metal plating layer to be equal to the height of the convex part.
14. The method according to claim 12, characterized in that said transition layer is obtained by:
forming the transition layer metal on the base material by electroless plating,
removing the transition layer metal covering the convex part by utilizing laser etching treatment so as to obtain a first sub-layer;
forming a second sublayer by nano-electroplating based on the transition layer metal, the first sublayer and the second sublayer constituting the transition layer.
15. The method according to claim 12, characterized in that said transition layer is obtained by:
forming a nano-plating metal by nano-plating based on the electroless plating metal, the electroless plating metal and the nano-plating metal constituting the transition layer metal;
and removing the transition layer metal covering the convex part by utilizing laser etching treatment so as to obtain the transition layer.
16. The method of claim 13, further comprising:
and forming a coating layer, wherein the coating layer is arranged on one side of the metal coating layer far away from the substrate, or the coating layer is arranged on the top surface of the bulge part and on one side of the metal coating layer far away from the substrate.
17. A mobile terminal, comprising:
the housing of claims 1-11.
18. The mobile terminal of claim 17, further comprising:
the antenna is arranged at the position corresponding to the bulge of the shell.
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