CN107175858B - Composite metal plate, shell for electronic equipment and electronic equipment - Google Patents

Abstract

The present invention proposes a composite metal sheet, a housing for electronic equipment, and electronic equipment. The composite metal sheet includes: a stainless steel layer; a lightweight metal layer provided on the stainless steel layer; and a sacrificial structure provided between the stainless steel layer and the lightweight metal layer On at least one of them, the sacrificial structure covers a portion of the surface of at least one of the stainless steel layer and the lightweight metal layer. The composite metal sheet has at least one of the following advantages: light weight, good mechanical properties, good appearance and strong corrosion resistance.

Description

Composite metal sheet, housing for electronic equipment, and electronic equipment

technical field

The present invention relates to the field of materials, in particular, to a composite metal sheet, a housing for electronic equipment, and electronic equipment.

Background technique

In recent years, with the wide application of metal casings in electronic equipment, metal sheets used for preparing casings of electronic equipment have also developed. Compared with sheets used in other scenarios, metal sheets used for electronic equipment are required to have certain mechanical strength, lighter weight, good heat dissipation, and better appearance effects.

However, the current composite metal sheets, housings for electronic devices, and electronic devices still need to be improved.

SUMMARY OF THE INVENTION

The present invention is accomplished based on the following findings of the inventors:

Existing metal sheets used for electronic equipment housings generally have problems such as poor corrosion resistance and unsatisfactory appearance effects. After in-depth research and a large number of experiments, the inventor found that this is mainly due to the fact that light weight, corrosion resistance and appearance effects are generally difficult to take into account. Specifically, if the overall casing of the electronic equipment is made of stainless steel with good corrosion resistance, the weight of the casing is too heavy, which affects the lightweight development of the electronic equipment. For example, to reduce the thickness of stainless steel, in order to ensure that the shell has sufficient mechanical strength, it is often necessary to use methods such as metal lamination technology to prepare multi-layer metal laminates. On the other hand, since the above-mentioned laminate has various metal elements, it is easy to form a galvanic battery when the surface of the casing is in contact with the liquid, and the corrosion resistance is poor. Therefore, it is necessary to prepare a coating for protecting the metal casing by masking methods such as spraying/electrophoresis. The above coatings tend to mask the good appearance of the metal itself. Therefore, under the premise of ensuring the mechanical properties and corrosion resistance of the metal plate, the quality of the plate can be reduced as much as possible, and the appearance effect of the metal material can be preserved, which will be beneficial to the further development of the current electronic equipment housing.

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. In view of this, in the first aspect of the present invention, the present invention provides a composite metal sheet. According to an embodiment of the present invention, the composite metal sheet includes: a stainless steel layer; a lightweight metal layer disposed on the stainless steel layer; and a sacrificial structure disposed on the stainless steel layer and On at least one of the lightweight metal layers, the sacrificial structure covers the stainless steel layer and a part of the surface of at least one of the lightweight metal layers. The lightweight metal layer can reduce the quality of the composite metal sheet while ensuring the mechanical properties of the sheet; the sacrificial structure can enhance the corrosion resistance of the sheet, and the stainless steel layer can retain the better appearance of the metal material for the composite metal sheet. The composite metal sheet has at least one of the following advantages: light weight, good mechanical properties, good appearance and strong corrosion resistance.

According to an embodiment of the present invention, the light metal layer is composed of metal or alloy. Thereby, the quality of the composite metal sheet can be further improved.

According to an embodiment of the present invention, the sacrificial structure is a metal block or an alloy block. Thereby, the quality of the composite metal sheet can be further improved.

According to an embodiment of the present invention, the potential of the metal element contained in the sacrificial structure is lower than the potential of the metal element with the lowest potential in the stainless steel layer and the light metal layer. In this way, when the surface of the metal sheet has liquid, the sacrificial structure can be preferentially corroded, which is beneficial to further improve the corrosion resistance of the composite metal sheet.

According to an embodiment of the present invention, the lightweight metal layer is composed of an aluminum alloy, and the sacrificial structure is composed of a magnesium alloy. Thus, the raw material cost of the composite metal sheet can be saved.

According to an embodiment of the present invention, the sacrificial structure is disposed on a side of the light metal layer away from the stainless steel layer, and the sacrificial structure covers a part of the surface of the light metal layer. Thereby, the appearance effect of the composite metal sheet may not be affected.

According to an embodiment of the present invention, the light metal layer covers part of the surface of the stainless steel layer, and the sacrificial structure is disposed on the side of the stainless steel layer facing the light metal layer, and is not covered by the light metal layer. on the covered surface and the sacrificial structure is in contact with the lightweight metal layer and the stainless steel layer. Thereby, the corrosion resistance of the composite metal sheet can be further improved.

According to an embodiment of the present invention, a plurality of the sacrificial structures are included. Thereby, the corrosion resistance of the composite metal sheet can be further improved.

In another aspect of the present invention, the present invention proposes a housing for an electronic device. According to an embodiment of the present invention, the housing is prepared from the previously described composite metal sheet. In general, the casing has at least one of the following advantages: light weight, good mechanical properties, good appearance and strong corrosion resistance.

According to an embodiment of the present invention, in the casing, the stainless steel layer is disposed on a side away from the inside of the electronic device, and the aluminum alloy layer and the sacrificial structure are disposed on a side facing the inside of the electronic device. Therefore, the corrosion resistance of the casing can be improved without affecting the appearance of the casing.

According to an embodiment of the present invention, the housing has at least one of an end surface and a through hole, and the sacrificial structure is disposed on the end surface and/or near the through hole. Corrosion is easy to occur at the end face and the through hole, and arranging the sacrificial structure at the above position is beneficial to further improve the corrosion resistance of the composite metal sheet.

In yet another aspect of the present invention, the present invention provides an electronic device. According to an embodiment of the present invention, the electronic device includes the aforementioned housing. In general, the electronic device has at least one of the following advantages: light weight, good appearance, good mechanical properties of the casing, and strong corrosion resistance.

Description of drawings

FIG. 1 shows a schematic structural diagram of a composite metal sheet according to an embodiment of the present invention;

FIG. 2 shows a schematic structural diagram of a composite metal sheet according to another embodiment of the present invention;

FIG. 3 shows a schematic structural diagram of a composite metal sheet according to yet another embodiment of the present invention;

FIG. 4 shows a schematic structural diagram of a composite metal sheet according to yet another embodiment of the present invention;

FIG. 5 shows a schematic structural diagram of a housing for an electronic device according to an embodiment of the present invention; and

FIG. 6 shows a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Description of reference numbers:

100: stainless steel layer; 200: light metal layer; 300: sacrificial structure; 10: through hole; 1000: housing; 1100: electronic equipment.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar modules or modules having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

In a first aspect of the present invention, the present invention provides a composite metal sheet. Referring to FIG. 1 , the composite metal sheet includes a stainless steel layer 100 , a lightweight metal layer 200 and a sacrificial structure 300 . The light-weight metal layer 200 is disposed on the stainless steel layer, and the light-weight metal layer 200 is formed of a material lighter in mass than stainless steel. The sacrificial structure is disposed on at least one of the stainless steel layer and the light metal layer, and the sacrificial structure covers a part of the surface of at least one of the stainless steel layer and the light metal layer. The lightweight metal layer can reduce the quality of the composite metal sheet while ensuring the mechanical properties of the sheet; the sacrificial structure can enhance the corrosion resistance of the sheet, and the stainless steel layer can retain the better appearance of the metal material for the composite metal sheet. The composite metal sheet has at least one of the following advantages: light weight, good mechanical properties, good appearance and strong corrosion resistance.

Below according to the specific embodiment of the present invention, each structure of this composite metal plate is described in detail:

According to the embodiment of the present invention, the specific composition of the stainless steel layer 100 is not particularly limited, and those skilled in the art can select an appropriate stainless steel type to form the stainless steel layer 100 according to the application scenario of the composite metal sheet. For example, according to specific embodiments of the present invention, the stainless steel layer may be formed of SUS 304 or SUS 316 type stainless steel.

According to the embodiment of the present invention, the specific material of the light-weight metal layer 200 is not particularly limited, as long as the quality of the composite metal sheet can be reduced while ensuring that the composite metal sheet has a certain mechanical strength as a whole. For example, according to specific embodiments of the present invention, the lightweight metal layer 200 may be composed of a metal or an alloy. Specifically, an aluminum alloy may be used to constitute the above-mentioned light-weight metal layer. More specifically, the lightweight metal layer 200 may be constituted by using a 6063 type aluminum alloy. Thereby, the quality of the composite metal sheet can be further improved. SUS 304 or SUS 316 type stainless steel and 6063 type aluminum alloy can be easily fixed by means including but not limited to lamination technology, and the formed stainless steel layer and light metal layer can maintain sufficient mechanical strength and have lighter mass. For example, according to a specific embodiment of the present invention, SUS 304 or SUS 316 stainless steel can be used to form the stainless steel layer 100 with a thickness of about 0.3 mm, and a 6063 aluminum alloy can be used to form the light metal layer 200 with a thickness of about 0.7 mm.

According to an embodiment of the present invention, the sacrificial structure 300 may be a metal block or an alloy block. According to the embodiment of the present invention, the potential of any metal element contained in the sacrificial structure 300 is lower than the potential of the metal element with the lowest potential in the stainless steel layer 100 and the light metal layer 200 . In this way, when the surface of the metal sheet has liquid, the sacrificial structure can be preferentially corroded, which is beneficial to further improve the corrosion resistance of the composite metal sheet. It should be noted that, in the present invention, "potential" refers specifically to a specific metal element (such as Fe in the stainless steel layer 100, or Al in a light metal, etc.), the lowest potential value at which the oxidation reaction occurs. According to a specific embodiment of the present invention, in the sacrificial structure, the potential of the metal element with the lowest oxidation potential may be not lower than -1.662V. According to an embodiment of the present invention, when the light metal layer is formed of an aluminum alloy, the sacrificial structure 300 may be formed of a magnesium alloy. Thus, the raw material cost of the composite metal sheet can be saved.

According to the embodiment of the present invention, the specific arrangement position of the sacrificial structure 300 is not particularly limited, as long as it is in contact with at least one of the light metal layer 200 and the stainless steel layer 100 . Therefore, when the surface of the stainless steel layer 100 has liquid and forms a galvanic cell, the sacrificial structure 300 can be preferentially corroded, so as to protect the stainless steel layer 100 and the light metal layer 200 of the composite metal sheet from being corroded, thereby ensuring that the composite metal sheet is not corroded Its main mechanical strength and surface appearance can be kept unaffected.

According to an embodiment of the present invention, referring to FIG. 2 , the sacrificial structure 300 may be disposed on a side of the light metal layer 200 away from the stainless steel layer 100 . The sacrificial structure 300 covers part of the surface of the light metal layer 200 . Thereby, the appearance effect of the composite metal sheet may not be affected.

According to an embodiment of the present invention, referring to FIG. 3 , the lightweight metal layer 200 covers part of the surface of the stainless steel layer 100 , the sacrificial structure 300 is disposed on the side of the stainless steel layer 100 facing the lightweight metal layer 200 , and the parts not covered by the lightweight metal layer 200 on the surface. That is, the sacrificial structure 300 is brought into contact with both the lightweight metal layer 200 and the stainless steel layer 100 . Thereby, the corrosion resistance of the composite metal sheet can be further improved. According to a specific embodiment of the present invention, in order to make the composite metal sheet have a uniform thickness as a whole, referring to FIG. 4 , the thicknesses of the lightweight metal layer 200 and the sacrificial structure 300 can be made the same, and the sacrificial structure 300 can be used to cover the lightweight metal The portion of stainless steel layer 100 not covered by layer 200. In this way, it can be ensured that the composite metal plate has a relatively regular shape as a whole, thereby facilitating subsequent processing of the composite metal plate.

According to the embodiment of the present invention, in order to further improve the corrosion resistance effect of the composite metal sheet, a plurality of sacrificial structures 300 may also be provided. Thereby, the corrosion resistance of the composite metal sheet can be further improved. The specific arrangement positions, shapes, areas, and thicknesses of the plurality of sacrificial structures 300 are not particularly limited, and those skilled in the art can select them according to actual conditions.

It should be noted that the specific shape of the composite metal sheet according to the embodiment of the present invention is not particularly limited. Referring to FIG. 2 to FIG. 4 , the composite metal sheet may be a flat sheet, or may have an arc portion and a vertical side wall plate.

In general, the composite metal sheet according to the embodiment of the present invention may have at least one of the following advantages:

(1) It has good mechanical strength and light weight;

(2) Good corrosion resistance;

(3) There is no need for additional anti-corrosion coating, which can maintain the good metal appearance of stainless steel materials.

In another aspect of the present invention, the present invention proposes a housing for an electronic device. According to embodiments of the present invention, the housing may be fabricated from the composite metal sheet described above. Therefore, the housing has all the features and advantages of the composite metal sheet described above, and will not be described again. In general, the casing has at least one of the following advantages: light weight, good mechanical properties, good appearance and strong corrosion resistance.

According to an embodiment of the present invention, referring to FIG. 5 , in the housing 1000 , the stainless steel layer 100 is disposed on the side away from the inside of the electronic device, and the aluminum alloy layer 200 and the sacrificial structure 300 are disposed on the side facing the inside of the electronic device. Therefore, the sacrificial structure 300 can be hidden inside the electronic device, and the corrosion resistance performance of the casing can be improved without affecting the appearance effect of the casing. It should be noted that, in the present invention, "external" refers specifically to the side of the electronic device that faces the external environment. Specifically, it refers to the side of the casing that can be seen and grasped by the user during the actual use of the electronic device; “interior” specifically refers to the side of the electronic device that is far away from the external environment.

According to the embodiment of the present invention, the specific shape of the housing 1000 is not particularly limited. For example, the housing 1000 may be a 2D or 3D housing, and the longitudinal section of the housing may have multiple arcuate edges (eg, two). The casing 1000 can be a back casing or a side frame of an electronic device. Alternatively, it can be an integral case that is integrally formed, including the back plate and the side frame. According to an embodiment of the present invention, the casing 1000 may have structures such as end faces and through holes. The sacrificial structure 300 may be disposed on the end face and near the through hole. Since corrosion is easy to occur at the end faces and through holes, arranging the sacrificial structure at the above-mentioned positions is beneficial to further improve the corrosion resistance of the composite metal sheet. According to an embodiment of the present invention, the housing 1000 may include a plurality of sacrificial structures 300 . A plurality of sacrificial structures 300 (300A and 300B as shown in the figure) can be disposed on the end face and the through hole 10 respectively, thereby further improving the corrosion resistance of the casing 1000 .

In yet another aspect of the present invention, the present invention provides an electronic device. According to an embodiment of the present invention, referring to FIG. 6 , the electronic device 1100 includes the housing 100 described above. Therefore, the electronic device has all the features and advantages of the casing described above, which will not be repeated here. In general, the electronic device has at least one of the following advantages: light weight, good appearance, good mechanical properties of the casing, and strong corrosion resistance.

It should be noted that the specific type of the electronic device is not particularly limited. For example, according to the specific embodiment of the present invention, the electronic device may be a mobile phone, a tablet computer, a notebook computer, or the like.

In the description of this specification, description with reference to the terms "one embodiment", "another embodiment", etc. means that a particular feature, structure, material or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention . In this specification, schematic representations of the above terms are not necessarily directed 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, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (4)

1. A casing for an electronic device, characterized in that the casing comprises: a stainless steel layer and a light-weight metal layer, the light-weight metal layer being arranged on the stainless-steel layer, and the light-weight metal layer The quality of the stainless steel layer is lower than that of the stainless steel layer; and a sacrificial metal structure is provided on the surface of the stainless steel layer that is not covered by the light metal layer on the side facing the light metal layer, and the sacrificial metal structure is not covered by the light metal layer. The structure is in contact with the light metal layer and the stainless steel layer, and the potential of the metal element contained in the sacrificial structure is lower than the potential of the metal element with the lowest potential in the stainless steel layer and the light metal layer, so In the sacrificial structure, the potential of the metal element with the lowest oxidation potential is not lower than -1.662V, the light metal layer is composed of aluminum alloy, the sacrificial structure is composed of magnesium alloy, The housing has at least one of an end surface and a through hole, and the sacrificial structure is disposed on the end surface and/or near the through hole. 2. The housing of claim 1, comprising a plurality of the sacrificial structures. 3 . The casing according to claim 1 , wherein, in the casing, the stainless steel layer is arranged on a side away from the inside of the electronic device, and the aluminum alloy layer and the sacrificial structure are arranged on the side facing the electronic device. 4 . inner side. 4. An electronic device, characterized in that it comprises the casing of any one of claims 1-3.

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