201006935 九、發明說明： - 【發明所屬之技術領域】 , 本發明涉及一種殼體，尤其涉及一種應用於電子產品之鎂 合金殼體及其製備方法。 【先前技術】 隨著電子產品之快速發展，電子產品（如手機、MP3播放 器、個人數位助理、電腦）之使用已非常普遍。電子裝置常使 用鎂合金、鋁合金金及不銹鋼等金屬材質做為殼體材料，以增 ⑩強其結構強度。 並且為使電子裝置具有較佳之外觀和特殊手感，於電子裝 置之金屬殼體上通常需形成圖案或紋路，例如於金屬殼體表面 形成拉絲紋路。對於鋁合金與不銹鋼而言，拉絲工藝可直接於 鋁合金或不銹鋼基材表面進行。惟，對於鎂合金，由於其化學 性質較為活潑，若直接於鎂合金基材表面拉絲，鎂合金基材容 易發生氧化或腐蝕現象，因此採用於鎂合金基材表面直接拉絲 π形成之鎂合金殼體不具有實用性。 【發明内容】 鑒於上述狀況，有必要提供一種容易避免氧化或腐蝕之具 有拉絲表面之鎂合金殼體及其製備方法。 一鎂合金殼體，其包括鎂合金基材，鎂合金殼體從鎂合金 基材表面向外還依次形成有化學鍍層、承載層、拉絲層及透明 保護層。 一鎂合金殼體之製備方法，包括以下步驟：提供鎂合金基 材；將該鎂合金基材浸入化成溶液中，於鎂合金基材表面形成 6 201006935 化學鍍層；於該化學鍍層上塗佈底漆、固化形成底漆層；於該 底漆層上塗佈色漆、固化形成色漆層；於該色漆層上進行拉 絲，形成拉絲層；於該拉絲層上塗佈金屬色塗料、固化形成外 觀增強層；及於該外觀增強層上塗佈透明漆、固化形成透明保 護層。 上述鎂合金殼體由於係在承載層上形成拉絲層，鎂合金基 材具有學鍍層與承載層之保護，因此其可避免鎂合金基材於拉 絲過程中容易被氧化/腐蝕。 ❿【實施方式】 下面將結合附圖及實施例對本發明之鎂合金殼體及其製 備方法作進一步之詳細說明。 請參見圖1，所示為本發明較佳實施方式之鎂合金殼體 10，其包括鎂合金基材π，從鎂合金基材11表面向外依次形 成之化學鍍層12、承載層13、拉絲層14、外觀增強層15及透 明保護層16。 ^ 鎂合金殼體10可用於各種電子產品之殼體。化學鍍層12 ❹ 用於防止鎂合金基材11被氧化，其可主要含有磷酸鹽。承載 層13用於進一步防止鎂合金基材11被氧化及改善鎂合金基材 11表面之平面度。承載層13可由與化學鍍層12相連之底漆層 132及形成於底漆層132上之色漆層134構成。底漆層132用 於增強化學鍍層12與色漆層134之間之黏附力，其可含有環 氧樹脂與黑顏料；色漆層134需具有較佳之硬度，其可含有壓 克力樹脂與黑顏料；黑顏料可為碳黑。拉絲層14形成於色漆 層134。外觀增強層15可為金屬色塗層，例如銀色塗層，其用 201006935 於增強拉絲層14之金屬感。外觀增強層15可主要含有壓克力 樹脂與鋁粉，優選為片狀鋁粉；外觀增強層15之厚度可為2 . 微米至5微米。透明保護層16需與外觀增強層15具有較佳之 黏附力，其可主要含有壓克力樹脂。 上述鎂合金殼體10由於係在承載層13上拉絲形成拉絲層 14，鎂合金基材11有化學鍍層12與底漆層132之保護，因此 可避免鎂合金基材11在拉絲過程t或在使用過程中被氧化/腐 蝕，提高鎂合金殼體10之實用性。並且由於鎂合金基材11上 ❹覆蓋有承載層13，因此鎂合金基材11之缺陷（例如壓鑄成型 過程中所形成之凹坑、裂縫等），可被承載層13覆蓋，從而易 於提升拉絲層14之拉絲紋路之均勻性及拉絲紋路之深度，進 一步改善鎂合金基材11之外觀。另，由於採用之外觀增強層 15為金屬色塗層，其還可增強拉絲層14之金屬感，進一步改 善鎂合金基材11之外觀。 一種製備上述鎂合金殼體10之方法包括以下步驟： 提供鎖合金基材11，鎖合金基材11可由鎮合金壓鑄成型 ❿ 而成。 將鎂合金基材11浸入化成溶液中，於鎂合金基材11表面 形成化學鍍層12 ;其中該化成溶液含有磷酸鹽。 於化學鍍層12上塗佈底漆、固化形成底漆層132 ;其中該 底漆可含有環氧樹脂與黑顏料，該黑顏料可為碳黑；塗佈之方 法可為手塗或喷塗。 於底漆層132上塗佈色漆、固化形成色漆層134 ;其中該 底漆可含有壓克力樹脂與黑顏料，該黑顏料可為碳黑；塗佈之 8 201006935 方法可為手塗或喷塗。 行㈣’形成拉絲層14 可採用布輪或砂帶拉絲，優選為布輪拉絲糸過程 14之紋路之均勻性，可進 …’亚且為棱兩拉絲層 於拉絲層14上塗佈金屬吏拉絲紋路加深。 15;其中該金屬色塗料可主要人固化形成外觀增強層 觀增強層15之可為2微米至 卞曰”片狀料，外 喷塗。 卞主5微未，塗佈之方法可為手塗或 ❹ ^卜觀㈣層15域佈㈣漆、· =透明漆可主要含有壓克力樹脂;塗佈之方法= 可以理解，當鎂合令私挪 、双體所需金屬感要求較低時，夕卜 觀增強層15可採用金屬色外 _時外 還可省去。 &卜之其他顏色，甚至外觀增強層15 具體實施例： 成叙鎂合金歸浸域成溶液以形成 鑛盾，在該鍛層上塗佈主1人士1^ &丄 士1 。 邯要3有環氧樹脂與黑顏料之底漆， 微二1=之烘烤15〜20分鐘，固化形成膜厚為15〜20 微未之底漆層’在底漆層上塗佈主要含有壓克力樹 ，色漆，在135〜urc之溫度下料15〜2Q分鐘，形成 厚為15〜2〇微米之色漆層；在色漆層上用布輪拉絲8次，^成 拉絲層，在拉絲層上塗佈含有片狀紹粉及壓克力樹脂之銀色塗 料’在135〜赋之溫度下烘烤15〜2〇分鐘，固化形成膜厚為 2〜3微米之外觀增強層；及在外觀增強層上塗佈含有壓克力樹 9 201006935 脂之透明漆，在135〜145°C之溫度下烘烤15〜20分鐘，固化形 成膜厚為12〜18微米之透明保護層，形成鎂合金殼體。上述製 備過程，形成之鎂合金殼體之良率較高。 此外對鎂合金殼體進行附著力測試、硬度測試及鹽霧測 試。其中用百格測試所測得之鎂合金殼體之附著力為5B ;用 鉛筆硬度試驗機，在荷重9.8牛頓、鉛筆呈45度之測試條件下， 所測得之鎂合金殼體之硬度為3H ;用鹽水喷霧實驗機，在測 試溫度35±2°C，鹽水為5%氯化鈉，兩個迴圈（8小時喷霧， ® 靜止16小時為一循環）之測試中，鎂合金殼體表面無氧化、無 起泡、無腐蚀。 由此可見，上述鎂合金殼體可避免被氧化或腐蝕而具有較 高之實用性，且上述鎂合金殼體在製備過程中還具有較高之製 備良率。 綜上所述，本發明符合發明專利要件，爰依法提出專利申 請。惟，以上所述者僅為本發明之較佳實施方式，本發明之範 i 圍並不以上述實施方式為限，舉凡熟悉本案技藝之人士，於援 ❹ 依本案發明精神所作之等效修飾或變化，皆應包含於以下之申 請專利範圍内。 【圖式簡單說明】 圖1係本發明較佳實施方式之鎂合金殼體之剖面示意圖。 【主要元件符號說明】 鎂合金殼體 10 色漆層 134 基材 11 拉絲層 14 化學鍍層 12 外觀增強層 15 201006935 承載層 底漆層 13 132 透明保護層 16201006935 IX. Description of the invention: - [Technical field to which the invention pertains] The present invention relates to a casing, and more particularly to a magnesium alloy casing applied to an electronic product and a preparation method thereof. [Prior Art] With the rapid development of electronic products, the use of electronic products (such as mobile phones, MP3 players, personal digital assistants, computers) has become very common. Electronic devices often use metal materials such as magnesium alloy, aluminum alloy gold and stainless steel as the shell material to increase their structural strength. In order to make the electronic device have a better appearance and a special hand feeling, a pattern or a texture is usually formed on the metal casing of the electronic device, for example, a wire drawing pattern is formed on the surface of the metal casing. For aluminum alloys and stainless steels, the wire drawing process can be carried out directly on the surface of an aluminum or stainless steel substrate. However, for magnesium alloys, since the chemical properties are relatively active, if the wire is directly drawn on the surface of the magnesium alloy substrate, the magnesium alloy substrate is prone to oxidation or corrosion, so the magnesium alloy shell formed by directly drawing the π on the surface of the magnesium alloy substrate is used. The body is not practical. SUMMARY OF THE INVENTION In view of the above circumstances, it is necessary to provide a magnesium alloy casing having a wire drawing surface which is easy to avoid oxidation or corrosion and a preparation method thereof. A magnesium alloy casing comprising a magnesium alloy substrate, wherein the magnesium alloy casing is further formed with an electroless plating layer, a carrier layer, a wire drawing layer and a transparent protective layer from the surface of the magnesium alloy substrate. A method for preparing a magnesium alloy casing comprises the steps of: providing a magnesium alloy substrate; immersing the magnesium alloy substrate into a solution, forming a chemical coating on the surface of the magnesium alloy substrate; 2010 201035; coating the bottom on the electroless plating layer Lacquering, curing to form a primer layer; applying a color paint on the primer layer to form a color paint layer; drawing on the color paint layer to form a wire drawing layer; coating the wire layer with a metallic paint and curing Forming an appearance reinforcing layer; and coating the transparent layer on the appearance reinforcing layer to form a transparent protective layer. Since the above-mentioned magnesium alloy casing forms a wire drawing layer on the bearing layer, the magnesium alloy substrate has the protection of the plating layer and the bearing layer, so that the magnesium alloy substrate can be easily oxidized/corroded during the drawing process. [Embodiment] Hereinafter, a magnesium alloy case of the present invention and a method for preparing the same will be further described in detail with reference to the accompanying drawings and embodiments. Referring to FIG. 1, there is shown a magnesium alloy casing 10 according to a preferred embodiment of the present invention, which comprises a magnesium alloy substrate π, an electroless plating layer 12 formed on the surface of the magnesium alloy substrate 11 and a carrier layer 13, and a wire drawing. Layer 14, appearance enhancement layer 15 and transparent protective layer 16. ^ The magnesium alloy casing 10 can be used for the housing of various electronic products. The electroless plating layer 12 is for preventing the magnesium alloy substrate 11 from being oxidized, and it may mainly contain phosphate. The carrier layer 13 serves to further prevent the magnesium alloy substrate 11 from being oxidized and to improve the flatness of the surface of the magnesium alloy substrate 11. The carrier layer 13 may be composed of a primer layer 132 connected to the electroless plating layer 12 and a color lacquer layer 134 formed on the primer layer 132. The primer layer 132 is used to enhance the adhesion between the electroless plating layer 12 and the color lacquer layer 134, which may contain epoxy resin and black pigment; the color lacquer layer 134 needs to have a better hardness, and may contain acrylic resin and black. Pigment; black pigment can be carbon black. The wire drawing layer 14 is formed on the color lacquer layer 134. The appearance enhancement layer 15 can be a metallic coating, such as a silver coating, which uses 201006935 to enhance the metallic feel of the drawstring 14. The appearance reinforcing layer 15 may mainly contain an acrylic resin and an aluminum powder, preferably a flake aluminum powder; and the appearance reinforcing layer 15 may have a thickness of from 2. micrometers to 5 micrometers. The transparent protective layer 16 needs to have a better adhesion to the appearance enhancing layer 15, which may mainly contain an acrylic resin. The magnesium alloy casing 10 is drawn on the carrier layer 13 to form the wire drawing layer 14, and the magnesium alloy substrate 11 is protected by the chemical plating layer 12 and the primer layer 132, so that the magnesium alloy substrate 11 can be prevented from being in the drawing process or in the drawing process. The utility of the magnesium alloy casing 10 is improved by oxidation/corrosion during use. And since the upper surface of the magnesium alloy substrate 11 is covered with the carrier layer 13, the defects of the magnesium alloy substrate 11 (for example, pits, cracks, and the like formed during the die-casting process) can be covered by the carrier layer 13, thereby facilitating lifting of the wire. The uniformity of the draw lines of the layer 14 and the depth of the draw lines further improve the appearance of the magnesium alloy substrate 11. Further, since the appearance reinforcing layer 15 is a metallic color coating, it can also enhance the metallic feeling of the drawing layer 14, and further improve the appearance of the magnesium alloy substrate 11. A method of preparing the above magnesium alloy casing 10 comprises the steps of: providing a lock alloy substrate 11 which can be formed by die casting of a town alloy. The magnesium alloy substrate 11 is immersed in a solution to form an electroless plating layer 12 on the surface of the magnesium alloy substrate 11; wherein the chemical conversion solution contains phosphate. A primer is applied to the electroless plating layer 12 to form a primer layer 132; wherein the primer may contain an epoxy resin and a black pigment, and the black pigment may be carbon black; the coating method may be hand coating or spray coating. Applying a color lacquer to the primer layer 132 to form a color lacquer layer 134; wherein the primer may contain an acrylic resin and a black pigment, the black pigment may be carbon black; and the coating 8 201006935 may be hand-coated Or spray. Line (4) 'Forming the drawing layer 14 can be drawn by a cloth wheel or a belt, preferably the uniformity of the texture of the cloth wheel drawing process 14, which can be applied to the drawing layer 14 on the drawing layer 14 The brushed lines are deepened. 15; wherein the metallic paint can be cured by a main person to form an appearance-enhancing layer reinforcement layer 15 which can be 2 micrometers to 卞曰" sheet material, and externally sprayed. 卞Main 5 micro-no, the coating method can be hand-coated Or ❹ ^卜观 (4) layer 15 domain cloth (four) lacquer, · = transparent lacquer can mainly contain acrylic resin; coating method = understandable, when magnesium alloy is private, the metal requirements of the double body are lower The outer layer of the reinforcing layer 15 can be omitted from the outside of the metal color. The other colors of the outer layer and even the appearance enhancing layer 15 are as follows: The synthetic magnesium alloy is immersed in a solution to form a mine shield. Apply the main person 1^ & gentleman 1 on the forged layer. The main 3 has epoxy resin and black pigment primer, micro 2 1 = baking for 15~20 minutes, curing to form a film thickness of 15 ~20 micro-prime primer layer is coated on the primer layer mainly containing acrylic tree, color paint, and is placed at a temperature of 135~urc for 15~2Q minutes to form a paint with a thickness of 15~2 microns. Layer; brushed on the color lacquer layer 8 times with a cloth wheel, into a drawing layer, and coated with a silver coating containing flaky powder and acrylic resin on the drawing layer' Bake at a temperature of 135 to 15 for 2 to 2 minutes, solidify to form an appearance enhancement layer having a film thickness of 2 to 3 μm; and apply a clear paint containing acrylic tree 9 201006935 grease on the appearance enhancement layer at 135 Baking at a temperature of ~145 ° C for 15 to 20 minutes, curing to form a transparent protective layer having a film thickness of 12 to 18 μm to form a magnesium alloy casing. The above-mentioned preparation process has a high yield of the magnesium alloy casing. In addition, the magnesium alloy shell was subjected to adhesion test, hardness test and salt spray test. The adhesion of the magnesium alloy shell measured by the Baige test was 5B; with the pencil hardness tester, the load was 9.8 Newtons and the pencil was presented. Under the test condition of 45 degrees, the hardness of the measured magnesium alloy shell was 3H; the test machine was sprayed with salt water at a test temperature of 35 ± 2 ° C, the brine was 5% sodium chloride, and two loops (8 In the test of hourly spray, ® static for 16 hours, the surface of the magnesium alloy shell is free from oxidation, blistering and corrosion. It can be seen that the above magnesium alloy casing can be oxidized or corroded and has a higher Practicality, and the above magnesium alloy casing is in the preparation process In view of the above, the present invention meets the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not To the extent that the above-mentioned embodiments are used, the equivalent modifications or variations made by Finix in accordance with the spirit of the invention shall be included in the scope of the following patents. [Simplified Schematic] Figure 1 is a Schematic diagram of a magnesium alloy casing according to a preferred embodiment of the invention. [Description of main components] Magnesium alloy casing 10 Paint layer 134 Substrate 11 Wire drawing layer 14 Electroless plating layer 12 Appearance reinforcing layer 15 201006935 Carrier layer primer layer 13 132 Transparent protective layer 16
1111