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The electrolytically colored surface has the same hardness and wear resistance as the sulfuric acid anodic oxidation film, and the film layer has particularly good ultraviolet radiation resistance, heat resistance, and good corrosion resistance.
After the anodization of aluminum in sulfuric acid solution, an artificial oxide film is formed on the surface of the product, and the surface of the oxide film is porous, which is called a porous layer. The bottom layer of the oxide film is in contact with the aluminum substrate, which is a dense oxide film sea layer, also called an active layer or a barrier layer. The aluminum material with the anodized film is immersed in the electrolyte of a certain metal salt and used as an electrode (because of alternating current). The other pole can be used with a spoon of electrolyte containing the same pure metal plate or graphite, stainless Steel Plate. When alternating current is applied across the two poles, (and generally under conditions of low voltage and low current density), the aluminum product automatically becomes a cathode, and hydrogen is released from it, while metal ions in the metal solution are in the industry. Aluminium profiles have a strong ion concentration difference formed near the aluminum product and penetrate deeper into the active layer through the porous layer, alternately undergoing severe reduction and slow oxidation, ie the active layer strongly attracts metal ions and is there The resulting negative electrostatic charge is repeatedly discharged and folded 51 metal particles or metal oxides. And deposited on the bottom of the fine 7L oxide film 3-6pI", the metal particles precipitated about d. O. O. O. 0. These particles are usually Wu hair-like, spherical or granular, its diameter is 10-15nnl, length is several microns, These golden particles are diffracted by light, causing oxide films to appear in various colors.
The principle of electrolytic coloring of industrial aluminum
Industrial electrolytic aluminum coloring, the first is the preparation of aluminum pieces in the sulfuric acid electrolyte clean, transparent porous anal clothing, the second step will be transferred to the acidic metal salt solution to the text flow electrolysis Department Fourthly, the metal particles are irreversibly deposited on the bottom of the pores of the oxide film. Any metal that can be carefully deposited in the aqueous solution can be used in electrolytic coloring. There are only a few remaining salts of practical value, such as tin, nickel, Words, silver salt, and salt, etc. The coloring principle and the overall bagging method are interrelated, and are produced by the absorption and scattering of metal particle elbow incidents: bio-envelope package. Hereby, the copper salt is used alone as red. Manganese, silver salts and salinity are ochre coloured. The tonal range of other metals is mostly bronze to black. In a specific medium, the color shade is determined by the gold ion deposition fortress, and has nothing to do with the thickness of the oxide film. The thickness of the oxide film used in the strand. In addition to the higher copper alloy containing copper stars and aluminum alloys containing high silicon content, most architectural aluminum profiles are suitable for this L art; the color of the overall emission method and the composition of industrial aluminum profiles and the state of Taiwan Gold have In a big way, another great advantage of the electrolytic coloring compared to the overall emission method is the much lower cost. It requires only 2/5 of the total power. This is the reason that the electrolytic coloring method is still widely used in Europe, E1, and China. c