TWI421371B - Method of anodizing aluminum or aluminum alloy - Google Patents

Description

鋁或鋁合金表面陽極處理方法 Aluminium or aluminum alloy surface anode treatment method

本發明涉及一種鋁或鋁合金表面陽極處理方法。 The invention relates to an aluminum or aluminum alloy surface anode treatment method.

為了適應消費者講究金屬質感之發展趨勢，電腦、通訊、消費性電子等3C產品之高等級產品逐漸以金屬機殼為主流。金屬材料具有電磁遮罩效果佳，散熱性良好，剛性佳，耐衝擊等優點，同時還具有可回收利用之環保特性。 In order to adapt to the trend of consumers paying attention to metal texture, high-grade products of 3C products such as computers, communications, and consumer electronics are gradually taking metal casings as the mainstream. The metal material has the advantages of good electromagnetic shielding effect, good heat dissipation, good rigidity, impact resistance, and the environmentally-friendly characteristics of recycling.

鋁及其合金具有重量輕、散熱快和外觀精美等優點，並可依需求而選擇亮面或霧面處理，因而很適於金屬機殼及其表面圖案之製作。在應用上常藉由陽極處理在表面形成一層氧化物膜，該氧化物膜可在鋁材表面形成堅硬耐磨、抗蝕性極高且色澤優美之外表。習知的於金屬機殼表面獲得不同色彩之氧化膜之陽極處理工藝均採用多次陽極處理和多次著色實現，其中每次陽極處理後均要藉由遮蔽之方式對下次陽極處理之區域進行劃分，這種方法雖能在金屬表面獲得多色彩氧化膜，但工藝較為複雜，且因為要設計用於遮蔽之治具，使得設計成本較高。同時，該方法很難做出高精密度之裝飾性圖紋。而且，該方法所獲得之氧化膜缺乏立體感，在同一金屬基體上難以獲得不同表面效果。 Aluminum and its alloys have the advantages of light weight, fast heat dissipation and exquisite appearance, and can be selected for bright surface or matte finish according to requirements, so it is suitable for the production of metal casings and their surface patterns. In the application, an oxide film is often formed on the surface by anodizing, and the oxide film can be formed on the surface of the aluminum material with hard wear resistance, high corrosion resistance and beautiful color. The conventional anodizing process for obtaining an oxide film of different colors on the surface of the metal casing is achieved by multiple anode treatments and multiple coloring, wherein each anode treatment is performed by masking on the region of the next anode treatment. Dividing, this method can obtain a multi-color oxide film on the metal surface, but the process is more complicated, and because of the design of the jig for shielding, the design cost is high. At the same time, this method is difficult to make high-precision decorative patterns. Moreover, the oxide film obtained by the method lacks a three-dimensional effect, and it is difficult to obtain different surface effects on the same metal substrate.

有鑒於此，本發明提供一種於同一鋁或鋁合金基體上獲得不同表面效果之陽極處理方法。 In view of this, the present invention provides an anodizing process for obtaining different surface effects on the same aluminum or aluminum alloy substrate.

一種鋁或鋁合金表面陽極處理方法，包括以下步驟：提供一鋁或鋁合金基體，該基體包括一內表面及與該內表面相背之外表面；對該基體之外表面進行第一種機加工處理，使該外表面具有第一種機加工表面效果；對該基體進行第一次陽極處理，以在基體表面形成具有第一種顏色之氧化膜；去除部分或全部形成於基體內表面上之氧化膜，以使該基體導電；對該基體之外表面進行不同於第一種機加工之第二種機加工處理，去除外表面之部分氧化膜，並使該去除氧化膜之區域具有第二種機加工表面效果；對該基體進行第二次陽極處理，以在該具有第二種機加工表面效果之區域形成具有不同於該第一種顏色之第二種顏色之氧化膜。 An aluminum or aluminum alloy surface anodizing method comprising the steps of: providing an aluminum or aluminum alloy substrate, the substrate comprising an inner surface and an outer surface opposite the inner surface; and the first surface of the outer surface of the substrate Processing, the outer surface has a first machined surface effect; the substrate is first anodized to form an oxide film having a first color on the surface of the substrate; and part or all of the substrate is formed on the inner surface of the substrate An oxide film for electrically conducting the substrate; performing a second machining process different from the first machining on the outer surface of the substrate, removing a portion of the oxide film on the outer surface, and having the region of the oxide film removed Two machined surface effects; the substrate is subjected to a second anodization to form an oxide film having a second color different from the first color in the region having the second machined surface effect.

相較於現有技術，本發明鋁或鋁合金表面陽極處理方法藉由對鋁或鋁合金表面進行一次以上之機加工處理以獲得不同之機加工表面效果，然後直接對每次機加工後之表面進行陽極氧化處理，並染上不同之顏色，由此在同一基體表面獲得具有立體感之不同表面效果。本方法無需專門設計用於劃分陽極處理區域之遮蔽治具 ，工藝簡單，成本較低。 Compared with the prior art, the aluminum or aluminum alloy surface anodizing method of the present invention can obtain different machined surface effects by performing more than one machining process on the surface of the aluminum or aluminum alloy, and then directly on the surface after each machining. Anodizing is carried out and dyed with different colors, thereby obtaining different surface effects having a three-dimensional effect on the same substrate surface. The method does not require a masking fixture specially designed for dividing the anode treatment area The process is simple and the cost is low.

本發明較佳實施例鋁或鋁合金表面陽極處理方法藉由對一鋁或鋁合金之金屬基體之陽極表面處理為例進行說明，包括如下步驟： In the preferred embodiment of the present invention, the surface treatment method for the aluminum or aluminum alloy surface is described by taking an anode surface treatment of a metal substrate of aluminum or aluminum alloy as an example, including the following steps:

(1)提供一鋁或鋁合金基體，該基體包括一內表面及與該內表面相背之外表面。 (1) An aluminum or aluminum alloy substrate is provided, the substrate comprising an inner surface and a surface opposite the inner surface.

(2)對該基體之外表面進行第一種機加工處理，使該外表面具有第一種機加工表面效果。例如，該基體外表面進行噴砂處理，使其呈現啞光霧面效果。 (2) performing a first machining treatment on the outer surface of the substrate such that the outer surface has a first machined surface effect. For example, the outer surface of the substrate is sandblasted to give a matte matte finish.

(3)對該基體進行第一次陽極處理，以在基體表面形成氧化膜。該步驟包括：首先將該基體於19~21℃、含180~220g/L硫酸之陽極處理溶液中，以10~12V的電壓進行陽極氧化處理45~55分鐘。其中硫酸之優選濃度為190~210g/L。並對該第一次陽極處理後之金屬基體進行第一次著色處理，使第一次陽極處理生成之氧化膜具有第一種顏色。該第一次著色處理可以為吸附著色或者化學著色，本實施例為吸附著色。然後，對該著色處理後之基體於含有封孔劑之溶液中進行封孔處理以提高其表面氧化膜之防污染和抗腐蝕性能。本實施例選用R500型號活性劑作為封孔劑，處理溫度為90~100℃，處理時間為12~18分鐘。最後將基體於60℃左右下烘乾。 (3) The substrate is subjected to a first anode treatment to form an oxide film on the surface of the substrate. The step comprises first anodizing the substrate at an anode treatment solution of 180-220 g/L sulfuric acid at 19-21 ° C for 45 to 55 minutes at a voltage of 10 to 12 V. The preferred concentration of sulfuric acid is 190-210 g/L. And performing the first coloring treatment on the metal substrate after the first anodization, so that the oxide film formed by the first anodizing treatment has the first color. The first coloring treatment may be adsorption coloring or chemical coloring, and this embodiment is adsorption coloring. Then, the colored substrate is subjected to a sealing treatment in a solution containing a sealing agent to improve the anti-pollution and anti-corrosion properties of the surface oxide film. In this embodiment, the R500 type active agent is selected as the sealing agent, the treatment temperature is 90-100 ° C, and the treatment time is 12-18 minutes. Finally, the substrate is dried at about 60 ° C.

(4)藉由鐳射雕刻去除部分或全部形成於基體內表面上之氧化膜，以使該基體導電。 (4) An oxide film partially or entirely formed on the inner surface of the substrate is removed by laser engraving to make the substrate conductive.

(5)對該基體之外表面進行不同於第一種機加工之第二種機加工處理，去除外表面之部分氧化膜，並使該去除氧化膜之區域具有不同於第一種機加工效果之第二種機加工表面效果。例如，該第二種機加工處理後之區域呈現精細之線條紋路效果，比如類似於光碟表面紋路的CD紋、太陽紋等。 (5) performing a second machining process different from the first machining on the outer surface of the substrate, removing a portion of the oxide film on the outer surface, and making the region of the oxide film different from the first machining effect The second machined surface effect. For example, the second machined area exhibits a fine line stripe effect, such as a CD pattern, a sun pattern, etc. similar to the surface texture of the disc.

(6)對該基體進行第二次陽極處理。該步驟包括：首先將該基體於19~21℃、含180~220g/L硫酸之陽極處理溶液中，以9.5~10.5V之電壓進行陽極氧化處理28~32分鐘。並對該第二次陽極處理後之金屬基體進行第二次著色處理，使該第二次陽極處理生成之氧化膜具有不同於第一次陽極處理氧化膜顏色之第二種顏色。該第二次著色處理可以為吸附著色或者化學著色，本實施例為吸附著色。然後，對該著色處理後之基體於含有封孔劑之溶液中進行封孔處理以提高其表面氧化膜之防污染和抗腐蝕性能。本實施例選用SH2型號封孔劑，處理溫度為90~100℃，處理時間為12~18分鐘。最後將基體於60℃左右下烘乾，即可與該鋁或鋁合金基體表面獲得兩種不同表面效果之雙色陽極表面。 (6) The substrate is subjected to a second anodizing treatment. The step comprises first anodizing the substrate at an anode treatment solution of 180 to 220 g/L sulfuric acid at 19 to 21 ° C for 28 to 32 minutes at a voltage of 9.5 to 10.5 V. And performing the second coloring treatment on the metal substrate after the second anodization, so that the oxide film formed by the second anodizing treatment has a second color different from the color of the first anodized oxide film. The second coloring treatment may be adsorption coloring or chemical coloring, and this embodiment is adsorption coloring. Then, the colored substrate is subjected to a sealing treatment in a solution containing a sealing agent to improve the anti-pollution and anti-corrosion properties of the surface oxide film. In this embodiment, the SH2 type sealing agent is selected, the processing temperature is 90~100 °C, and the processing time is 12-18 minutes. Finally, the substrate is dried at about 60 ° C to obtain two-color anode surface with two different surface effects on the surface of the aluminum or aluminum alloy substrate.

進行該第一次陽極處理前，還對基體進行陽極處理前處理。該前處理包括：用含有相應金屬脫脂劑之溶液清洗基體，然後將該基體置於含磷酸和硫酸之溶液進行化學拋光處理，接著用含20%~40%硝酸之溶液對該化學拋光處理後之金屬基體剝黑膜，以去除工件因上述化學拋光處理時於其表面形成之一層黑色的膜。 The substrate is also subjected to an anodizing pretreatment before the first anodizing treatment. The pretreatment comprises: washing the substrate with a solution containing the corresponding metal degreaser, and then subjecting the substrate to a solution containing phosphoric acid and sulfuric acid for chemical polishing, followed by chemical polishing after treatment with a solution containing 20% to 40% nitric acid. The metal substrate is stripped of a black film to remove a black film formed on the surface of the workpiece by the above chemical polishing treatment.

可以理解，重複以上步驟(4)至(6)，可以於該基體上獲得更多表面效果、多色彩之陽極表面。 It can be understood that by repeating the above steps (4) to (6), a more surface effect, multi-color anode surface can be obtained on the substrate.

相較於現有技術，本發明鋁或鋁合金表面陽極處理方法藉由對鋁或鋁合金表面進行一次以上之機加工處理以獲得不同之機加工表面效果，然後直接對每次機加工後之表面進行陽極氧化處理，並染上不同之顏色，由此在同一基體表面獲得具有立體感之不同表面效果。本方法無需專門設計用於劃分陽極處理區域之遮蔽治具，工藝簡單，成本較低。 Compared with the prior art, the aluminum or aluminum alloy surface anodizing method of the present invention can obtain different machined surface effects by performing more than one machining process on the surface of the aluminum or aluminum alloy, and then directly on the surface after each machining. Anodizing is carried out and dyed with different colors, thereby obtaining different surface effects having a three-dimensional effect on the same substrate surface. The method does not need to be specially designed for the shielding fixture for dividing the anode treatment area, and the process is simple and the cost is low.

Claims (7)

一種鋁或鋁合金表面陽極處理方法，包括以下步驟：提供一鋁或鋁合金基體，該基體包括一內表面及與該內表面相背之外表面；對該基體之外表面進行第一種機加工處理，該第一種機加工處理為噴砂處理，使該外表面具有啞光霧面效果；對該基體進行第一次陽極處理和著色處理，以在基體表面形成具有第一種顏色之氧化膜；藉由鐳射雕刻去除部分或全部形成於基體內表面上之氧化膜，以使該基體導電；對該基體之外表面進行不同於第一種機加工之第二種機加工處理，去除外表面之部分氧化膜，並使該去除氧化膜之區域呈現線條紋路效果；對該基體進行第二次陽極處理和著色處理，以在該具有第二種機加工表面效果之區域形成具有不同於第一種顏色之第二種顏色的氧化膜。 An aluminum or aluminum alloy surface anodizing method comprising the steps of: providing an aluminum or aluminum alloy substrate, the substrate comprising an inner surface and an outer surface opposite the inner surface; and the first surface of the outer surface of the substrate Processing, the first machining process is sandblasting, so that the outer surface has a matte matte effect; the substrate is subjected to a first anodizing treatment and a coloring treatment to form an oxidation of the first color on the surface of the substrate. a film; an oxide film partially or entirely formed on the inner surface of the substrate is removed by laser engraving to make the substrate conductive; and the outer surface of the substrate is subjected to a second machining process different from the first machining, and the outer surface is removed. a partial oxide film on the surface, and causing the region of the oxide film to exhibit a line stripe effect; the substrate is subjected to a second anodizing treatment and a coloring treatment to form a region different from the second machined surface effect An oxide film of a second color of color. 如申請專利範圍第1項所述之鋁或鋁合金表面陽極處理方法，其中該第一次陽極處理、第二次陽極處理之電解液含180~220g/L硫酸，電解液溫度為19℃~21℃。 The method for treating anodizing of aluminum or aluminum alloy surface according to claim 1, wherein the first anodizing treatment and the second anodizing electrolyte comprise 180-220 g/L sulfuric acid, and the electrolyte temperature is 19 ° C. 21 ° C. 如申請專利範圍第1項所述之鋁或鋁合金表面陽極處理方法，其中該第一次陽極處理電壓為10~12V之間，處理時間為45~55分鐘。 The method for treating anodizing of aluminum or aluminum alloy surface according to claim 1, wherein the first anode treatment voltage is between 10 and 12 V, and the treatment time is 45 to 55 minutes. 如申請專利範圍第1項所述之鋁或鋁合金表面陽極處理方法，其中該第二次陽極處理電壓為9.5~10.5V之間，處理時間為28~32分鐘。 The method for anodizing aluminum or aluminum alloy surface as described in claim 1, wherein the second anode treatment voltage is between 9.5 and 10.5 V, and the treatment time is 28 to 32 minutes. 如申請專利範圍第1項所述之鋁或鋁合金表面陽極處理方法，其中第一次陽極處理、第二次陽極處理步驟均包括對生成之陽極氧化膜進行封孔處理。 The method for anodizing aluminum or aluminum alloy surface according to claim 1, wherein the first anodizing treatment and the second anodizing step comprise sealing the formed anodized film. 如申請專利範圍第1項所述之鋁或鋁合金表面陽極處理方法，其中該著色方法為吸附著色。 An aluminum or aluminum alloy surface anodizing method as described in claim 1, wherein the coloring method is adsorption coloring. 如申請專利範圍第6項所述之鋁或鋁合金表面陽極處理方法，其中進行該第一次陽極處理前，還對該基體進行陽極處理前處理，該前處理包括：脫脂清洗、化學拋光處理及剝黑膜。 The method for treating an aluminum or aluminum alloy surface according to claim 6, wherein before the first anodizing, the substrate is subjected to an anodizing treatment, the pretreatment comprising: degreasing cleaning, chemical polishing treatment And peeling black film.