TWI695909B - Surface treatment process for magnesium alloy - Google Patents
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- TWI695909B TWI695909B TW107131632A TW107131632A TWI695909B TW I695909 B TWI695909 B TW I695909B TW 107131632 A TW107131632 A TW 107131632A TW 107131632 A TW107131632 A TW 107131632A TW I695909 B TWI695909 B TW I695909B
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
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Abstract
Description
本發明涉及一種金屬表面處理方法，尤其涉及一種鎂合金表面處理工藝。 The invention relates to a metal surface treatment method, in particular to a magnesium alloy surface treatment process.
鎂合金為一種輕質結構材料，與鋼，鋁，塑膠等工程材料相比，鎂合金具有較高的比強度及比剛度、極好的可加工性與尺寸穩定性、較好的電磁遮罩性能及可再循環利用性等優。該等特性使得鎂合金成為汽車工業、航空工業及電子工業等中首選的結構材料，並在家電製造、精密儀器、交通運輸工具、武器輕量化裝備及飾品行業的用途越來越廣泛。然，鎂合金的化學及電化學活性較高，嚴重制約了鎂合金的應用。故，採用適當的表面處理工藝提高鎂合金的耐蝕性成為鎂合金材料發展的重要課題。 Magnesium alloy is a lightweight structural material. Compared with steel, aluminum, plastics and other engineering materials, magnesium alloy has higher specific strength and specific rigidity, excellent workability and dimensional stability, and better electromagnetic shielding. Excellent performance and recyclability. These characteristics make magnesium alloys the preferred structural materials in the automotive industry, aerospace industry, and the electronics industry, and are increasingly used in home appliance manufacturing, precision instruments, transportation, weapon lightweight equipment, and jewelry industries. However, the high chemical and electrochemical activity of magnesium alloys severely restricts the application of magnesium alloys. Therefore, the use of appropriate surface treatment technology to improve the corrosion resistance of magnesium alloys has become an important issue in the development of magnesium alloy materials.
有鑑於此，有必要提供一種鎂合金表面處理工藝，以提高所述鎂合金的耐腐蝕性。 In view of this, it is necessary to provide a magnesium alloy surface treatment process to improve the corrosion resistance of the magnesium alloy.
一種鎂合金表面處理工藝，其包括以下步驟：步驟S1，將鎂合金進行脫脂，去除所述鎂合金表面的油脂與灰塵；步驟S2，對脫脂處理後的鎂合金進行水洗； 步驟S3，將上述水洗後的鎂合金進行酸洗，去除所述鎂合金表面的氧化物；步驟S4，將酸洗後的鎂合金進行水洗；步驟S5，將酸洗並水洗後的鎂合金進行鹼洗，去除所述鎂合金表面在酸洗產生的黑灰，從而將鎂合金基材完全暴露；步驟S6，將上述鹼洗後的鎂合金進行水洗；步驟S7，將鹼洗並水洗後的鎂合金置於包含脂肪族碳酸及脂肪族碳酸鹽中的至少一種的鈍化液中進行鈍化處理，所述脂肪族碳酸及/或脂肪族碳酸鹽與鎂合金反應，生成有機金屬複合鹽並沉積在所述鎂合金表面，從而在所述鎂合金表面形成緻密均勻且不含磷的灰白色的膜層；步驟S8，將上述鈍化處理後的鎂合金進行水洗；及步驟S9，對上述鈍化處理並水洗後的鎂合金進行烘烤。 A magnesium alloy surface treatment process includes the following steps: step S1, degreasing the magnesium alloy to remove grease and dust on the surface of the magnesium alloy; step S2, washing the degreasing magnesium alloy with water; Step S3, pickling the above washed magnesium alloy to remove oxides on the surface of the magnesium alloy; Step S4, washing the pickled magnesium alloy with water; Step S5, pickling and washing the magnesium alloy with water Alkaline washing, removing the black ash generated on the surface of the magnesium alloy during acid washing, thereby completely exposing the magnesium alloy substrate; Step S6, washing the magnesium alloy after the alkaline washing described above; Step S7, washing after alkaline washing and water washing The magnesium alloy is placed in a passivation solution containing at least one of aliphatic carbonic acid and aliphatic carbonate for passivation treatment. The aliphatic carbonic acid and/or aliphatic carbonate reacts with the magnesium alloy to form an organic metal compound salt and deposit it in The magnesium alloy surface, thereby forming a dense, uniform and phosphor-free off-white film layer on the surface of the magnesium alloy; step S8, the magnesium alloy after the passivation treatment is washed with water; and step S9, the above passivation treatment is washed with water After the magnesium alloy is baked.
進一步地，所述鈍化處理的溫度為40℃~50℃，所述鈍化處理的時間為4分鐘~6分鐘。 Further, the temperature of the passivation treatment is 40°C to 50°C, and the time of the passivation treatment is 4 minutes to 6 minutes.
進一步地，所述膜層的厚度為2微米~3微米。 Further, the thickness of the film layer is 2 microns to 3 microns.
進一步地，所述脫脂處理的溫度為50℃~70℃，所述脫脂處理的時間為5分鐘~9分鐘。 Further, the temperature of the degreasing treatment is 50°C to 70°C, and the time of the degreasing treatment is 5 minutes to 9 minutes.
進一步地，所述酸洗的溫度為40℃~60℃，所述酸洗的時間為50秒~70秒。 Further, the temperature of the pickling is 40°C to 60°C, and the time of the pickling is 50 seconds to 70 seconds.
進一步地，所述鹼洗的溫度為60℃~80℃，所述鹼洗的時間為5分鐘~7分鐘。 Further, the temperature of the alkaline washing is 60°C to 80°C, and the time of the alkaline washing is 5 minutes to 7 minutes.
進一步地，所述烘烤的溫度為100℃~150℃，所述烘烤的時間為40分鐘~60分鐘。 Further, the baking temperature is 100°C to 150°C, and the baking time is 40 minutes to 60 minutes.
相較於習知技術，本發明的鎂合金表面處理工藝避免了磷元素造成的污染，其工藝環保。且經本發明的鎂合金表面處理工藝處理後的鎂合金，其表面形成的緻密且均勻的膜層，有利於提高鎂合金的耐蝕性。 Compared with the conventional technology, the magnesium alloy surface treatment process of the present invention avoids the pollution caused by the phosphorus element, and the process is environmentally friendly. The dense and uniform film layer formed on the surface of the magnesium alloy treated by the magnesium alloy surface treatment process of the present invention is conducive to improving the corrosion resistance of the magnesium alloy.
圖1為本發明較佳實施方式的鎂合金表面處理工藝的流程示意圖。 FIG. 1 is a schematic flow chart of a magnesium alloy surface treatment process according to a preferred embodiment of the present invention.
圖2為經本發明的鎂合金表面處理工藝處理後的鎂合金表面放大100倍的掃描電鏡圖。 2 is a scanning electron micrograph of the magnesium alloy surface magnified 100 times after being treated by the magnesium alloy surface treatment process of the present invention.
圖3為經本發明的鎂合金表面處理工藝處理後的鎂合金表面放大500倍的掃描電鏡圖。 FIG. 3 is a scanning electron micrograph of the magnesium alloy surface magnified 500 times after being treated by the magnesium alloy surface treatment process of the present invention.
圖4為鎂合金經本發明的鎂合金表面處理工藝處理前及處理後的示意圖。 4 is a schematic diagram of a magnesium alloy before and after being treated by the magnesium alloy surface treatment process of the present invention.
為能進一步闡述本發明達成預定發明目的所採取的技術手段及功效，以下結合圖1~圖4及較佳實施方式，對本發明鎂合金表面處理工藝的具體實施方式、結構、特徵及其功效，詳細說明如下。 In order to further elaborate the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, characteristics and efficacy of the magnesium alloy surface treatment process of the present invention will be described below in conjunction with FIGS. 1 to 4 and preferred embodiments. The detailed description is as follows.
請參閱圖1~圖4，本發明一較佳實施方式的鎂合金表面處理工藝，其包括以下步驟： Please refer to FIG. 1 to FIG. 4, a magnesium alloy surface treatment process according to a preferred embodiment of the present invention includes the following steps:
步驟S1，將鎂合金進行脫脂，去除所述鎂合金表面的油脂與灰塵。 Step S1: Degrease the magnesium alloy to remove grease and dust on the surface of the magnesium alloy.
具體的，使用脫脂劑在50℃~70℃下對鎂合金進行脫脂處理5分鐘~9分鐘。本實施方式中，將昆山韓鋁生產的MCL-01配置成濃度為70g/L的溶液作為脫脂劑。 Specifically, the degreasing agent is used to degrease the magnesium alloy at 50°C to 70°C for 5 to 9 minutes. In the present embodiment, MCL-01 produced by Kunshan Hanaluminum is configured as a solution with a concentration of 70 g/L as a degreasing agent.
步驟S2，對脫脂處理後的鎂合金進行水洗。 In step S2, the magnesium alloy after the degreasing treatment is washed with water.
具體的，在室溫下對脫脂處理後的鎂合金進行三次水洗，所述水洗的總時長為10分鐘~12分鐘。 Specifically, the degreased magnesium alloy is washed three times at room temperature, and the total duration of the water washing is 10 minutes to 12 minutes.
步驟S3，將上述水洗後的鎂合金進行酸洗，去除所述鎂合金表面的氧化物。 Step S3, pickling the magnesium alloy after water washing to remove oxides on the surface of the magnesium alloy.
具體的，將水洗後的鎂合金置於酸性溶液中進行酸洗，所述酸洗的溫度為40℃~60℃，所述酸洗的時間為50秒~70秒。 Specifically, the magnesium alloy after water washing is placed in an acid solution for acid washing, and the temperature of the acid washing is 40°C to 60°C, and the time of the acid washing is 50 seconds to 70 seconds.
本實施方式中，將昆山韓鋁生產的MET-05配置成濃度為50g/L的溶液作為酸性溶液用於酸洗。 In this embodiment, the MET-05 produced by Kunshan Hanaluminum is configured as a solution with a concentration of 50 g/L as an acidic solution for acid washing.
如所述鎂合金為經過壓鑄成型的，所述酸洗還可去除壓鑄成型時噴塗的離型劑。 If the magnesium alloy is formed by die casting, the pickling can also remove the release agent sprayed during the die casting.
步驟S4，將酸洗後的鎂合金進行水洗。 Step S4: Wash the pickled magnesium alloy with water.
具體的，在室溫下對脫脂處理後的鎂合金進行二次水洗，所述水洗的總時長為5分鐘~7分鐘。 Specifically, the degreased magnesium alloy is subjected to secondary water washing at room temperature, and the total duration of the water washing is 5 minutes to 7 minutes.
步驟S5，將酸洗並水洗後的鎂合金進行鹼洗，去除所述鎂合金表面在酸洗產生的黑灰，從而將鎂合金基材完全暴露。 In step S5, the magnesium alloy after acid washing and water washing is subjected to alkaline washing to remove the black ash generated on the surface of the magnesium alloy during acid washing, thereby completely exposing the magnesium alloy substrate.
具體的，將鎂合金置於鹼性溶液中進行鹼洗，所述鹼洗的溫度為60℃~80℃，所述鹼洗的時間為5分鐘~7分鐘。 Specifically, the magnesium alloy is placed in an alkaline solution for alkaline washing, the temperature of the alkaline washing is 60°C to 80°C, and the time of the alkaline washing is 5 minutes to 7 minutes.
本實施方式中，將昆山韓鋁生產的MAT-301配置成濃度為125g/L的溶液作為鹼性溶液用於鹼洗。 In this embodiment, the MAT-301 produced by Kunshan Hanaluminum is configured as a solution with a concentration of 125 g/L as an alkaline solution for alkaline washing.
步驟S6，將上述鹼洗後的鎂合金進行水洗。 In step S6, the magnesium alloy after the alkali washing is washed with water.
具體的，在室溫下對脫脂處理後的鎂合金進行三次水洗，所述水洗的總時長為10分鐘~12分鐘。 Specifically, the degreased magnesium alloy is washed three times at room temperature, and the total duration of the water washing is 10 minutes to 12 minutes.
步驟S7，將鹼洗並水洗後的鎂合金置於包含脂肪族碳酸及脂肪族碳酸鹽中的至少一種的鈍化液中進行鈍化處理，所述脂肪族碳酸及/或脂肪族碳 酸鹽與鎂合金反應，生成有機金屬複合鹽並沉積在所述鎂合金表面，從而在所述鎂合金表面形成緻密均勻且不含磷的灰白色的膜層。 In step S7, the magnesium alloy after alkali washing and water washing is placed in a passivation solution containing at least one of aliphatic carbonic acid and aliphatic carbonate for passivation treatment, the aliphatic carbonic acid and/or aliphatic carbon The acid salt reacts with the magnesium alloy to form an organic metal composite salt and deposit it on the surface of the magnesium alloy, thereby forming a dense, uniform and phosphor-free, off-white film on the surface of the magnesium alloy.
具體的，所述鈍化處理的溫度為40℃~50℃，所述鈍化處理的時間為4分鐘~6分鐘，在保證形成膜層的前提下降低鈍化液的損耗及鈍化液對設備的損傷。所述膜層的厚度為2微米~3微米。所述膜層可有效地增強所述鎂合金的耐腐蝕性，且在鎂合金上形成塗料時，可有效地增強所述鎂合金與塗料間的結合力。 Specifically, the temperature of the passivation treatment is 40° C. to 50° C., and the time of the passivation treatment is 4 minutes to 6 minutes. The loss of the passivation liquid and the damage of the passivation liquid to the equipment are reduced under the premise of ensuring the formation of the film layer. The thickness of the film layer is 2 microns to 3 microns. The film layer can effectively enhance the corrosion resistance of the magnesium alloy, and when the coating is formed on the magnesium alloy, the binding force between the magnesium alloy and the coating can be effectively enhanced.
步驟S8，將上述鈍化處理後的鎂合金進行水洗。 In step S8, the magnesium alloy after the passivation treatment is washed with water.
具體的，在室溫下對脫脂處理後的鎂合金進行三次水洗，所述水洗的總時長為10分鐘~12分鐘。 Specifically, the degreased magnesium alloy is washed three times at room temperature, and the total duration of the water washing is 10 minutes to 12 minutes.
步驟S9，對上述鈍化處理並水洗後的鎂合金進行烘烤。 In step S9, the magnesium alloy after the above passivation treatment and water washing is baked.
具體的，所述烘烤的溫度為100℃~150℃，所述烘烤的時間為40分鐘~60分鐘。 Specifically, the baking temperature is 100°C to 150°C, and the baking time is 40 minutes to 60 minutes.
由圖2~圖4可知，所述鎂合金表面處理工藝處理後的鎂合金表面的膜層均勻且緻密，有利於提高鎂合金的耐蝕性。 It can be seen from FIG. 2 to FIG. 4 that the film layer on the surface of the magnesium alloy after the magnesium alloy surface treatment process is uniform and dense is conducive to improving the corrosion resistance of the magnesium alloy.
相較於習知技術，本發明的鎂合金表面處理工藝避免了磷元素造成的污染，其工藝環保。且經本發明的鎂合金表面處理工藝處理後的鎂合金，其表面形成的緻密且均勻的膜層，有利於提高鎂合金的耐蝕性。 Compared with the conventional technology, the magnesium alloy surface treatment process of the present invention avoids the pollution caused by the phosphorus element, and the process is environmentally friendly. The dense and uniform film layer formed on the surface of the magnesium alloy treated by the magnesium alloy surface treatment process of the present invention is conducive to improving the corrosion resistance of the magnesium alloy.
另，對於本領域的普通技術人員來說，可根據本發明的技術構思做出其它各種相應的改變與變形，而所有該等改變與變形均應屬於本發明申請專利範圍的保護範圍。 In addition, for those of ordinary skill in the art, various other corresponding changes and modifications can be made according to the technical concept of the present invention, and all such changes and modifications should fall within the protection scope of the patent application scope of the present invention.
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| CN104087927A (en) * | 2014-06-20 | 2014-10-08 | 四川劲德兴镁铝科技有限公司 | Magnesium alloy product surface modification treatment method |
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| CN104087927A (en) * | 2014-06-20 | 2014-10-08 | 四川劲德兴镁铝科技有限公司 | Magnesium alloy product surface modification treatment method |
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