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5052彩涂铝板的电解着色

返回列表 来源: 发布日期: 2020.10.27

5052彩涂铝板的电解着色

5052彩涂铝板的电解着色具有良好的装饰性,在国内外得到了广泛的应用,特别是在建筑铝型材的表面处理中。目前主要采用锡镍混合盐电解着色。5052彩涂铝板生产的产品颜色主要是香槟色。与单一的镍盐着色相比,锡镍混合盐电解着色产品色泽鲜艳,色彩丰富。主要问题是产品有色差。铝型材生产过程中挤压工艺和氧化着色工艺不合理,会导致产品色差。

5052彩涂铝板挤压工艺对氧化着色的影响主要是模具设计、挤压温度、挤压速度和冷却方式对挤压型材表面状态和组织均匀性的影响。模具设计应能使进料充分混合,否则容易产生亮(暗)带缺陷,同一型材可能出现分色;同时,模具状态和型材表面的挤出线也会影响氧化着色。不同的挤出温度、速度、冷却方式和冷却时间会导致结构不均匀和色差。阳极氧化对电解着色的色差有着非常重要的影响,特别是在垂 5052彩涂铝板直氧化生产线的生产过程中。立式氧化池深度为7.5m,上下槽液容易出现温差。温度对阳极氧化有重要影响。高温会加剧氧化膜的溶解,多孔阳极氧化膜表面的孔径会增大,否则,多孔阳极氧化膜的孔径会变小。另外,温度越高,阳极氧化膜的孔隙率越高,反之亦然。电解着色主要是使着色溶液中的金属离子在氧化膜微孔的阻挡层表面进行电化学还原反应,使着色溶液中的金属离子沉积在阳极氧化膜孔的底部,散射入射光并显示不同的颜色。微孔中沉积的材料越多,颜色越深。在相同的电荷条件下,在高温和低温零件上沉积同样数量的金属或金属化合物。对于孔隙率高、表面孔径大的零件,每个孔的平均沉积量较小。因此,5052铝板的颜色相对较浅,否则,颜色偏暗,造成两种颜色的着色材料。在5052铝板阳极氧化过程中,导电性对氧化膜有影响,也会造成着色材料的色差。这种问题在卧式生产线上很容易发生。主要原因是在氧化前的氧化毛坯的上排过程中,夹持材料不严密,导致个别材料导电性差,从而导致材料的导电性变差

The electrolytic coloring of 5052 aluminum plate has good decorative property, so it is widely used at home and abroad, especially in the surface treatment of architectural aluminum profiles. At present, the main process is electrolytic coloring with tin nickel mixed salt. The color of the product produced is mainly champagne color. Compared with single nickel salt coloring, the color of tin nickel mixed salt electrolytic coloring product is bright and full of color. The main problem is that the product has color difference. The unreasonable extrusion process and oxidation coloring process in the production process of aluminum profiles will lead to color difference.

The influence of extrusion process on oxidation coloring is mainly the influence of die design, extrusion temperature, extrusion speed and cooling mode on the surface state and microstructure uniformity of extruded profiles. The die design should be able to make the feed fully blended, otherwise it is easy to have bright (dark) band defects, and color separation may appear on the same profile; meanwhile, the die state and extrusion lines on the profile surface also affect the oxidation coloring. Different extrusion temperature, speed, cooling mode and cooling time will lead to uneven structure and color difference. Anodizing has a very important influence on the color difference of electrolytic coloring, especially in the production process of vertical oxidation line. The depth of vertical oxidation tank is 7.5 m, and the temperature difference between upper and lower bath liquid is easy to occur. Temperature has an important impact on anodizing. High temperature will aggravate the dissolution of the oxide film, and the pore size on the surface of porous anodic oxide film will increase, otherwise, porous The pore size of the anodic oxide film is smaller. In addition, the higher the temperature, the higher the porosity of anodic oxide film, and vice versa. Electrolytic coloring is mainly to make the metal ions in the coloring solution conduct electrochemical reduction reaction on the surface of the barrier layer in the micropore of the oxide film, so that the metal ions in the coloring solution are deposited at the bottom of the anodic oxide film hole, scattering the incident light and showing different colors. The more materials are deposited in the micro hole, the deeper the color is. Under the condition of the same electric charge, the same amount of metal or metal compound is deposited on the parts with high and low temperature. For the parts with high porosity and large surface pore diameter, the average amount of deposit in each hole is less. Therefore, 5052 aluminum plate is relatively light in color, otherwise, the color is dark, resulting in two colors of coloring material. In the anodizing process of 5052 aluminum plate, the conductivity has an impact on the oxide film, which will also cause the color difference of the coloring material. This problem is easy to occur in the horizontal production line. The main reason is that the clamping material is not tight in the upper row process of the oxidation blank before oxidation, resulting in poor conductivity of individual material, which 

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