[China Aluminum Network] With the increasingly widespread use of aluminum and aluminum alloys, and its increasing demand for decoration and functionality, various requirements for electrolytic coloring have been proposed in production. The color film obtained by electrolytic painting of aluminum and aluminum alloys has outstanding wear resistance, light resistance, heat resistance and corrosion resistance to various chemical media, and is more applicable to the decoration and protection of various profiles for construction. . Because of the development and application of solar energy, the diversification of daily-use products, and the popularization of skilled arts and crafts, the purpose and demand for the color of aluminum and aluminum alloy finished products are very clear. If the curtain wall of a large building in the city is silver-white, the reflection is too strong, it will affect the senses of the pedestrians and affect the air traffic, and the formation of optical pollution is simple. Therefore, it is desirable to use darker and softer bronze or other colors. Interior utensils or ordinary aluminum products are more decorated with gold, bronze or bronze, and more colors are expected to be selected. The solar water heater's heat absorption board requires deep black and so on. As a result, with the continuous addition of aluminum and aluminum alloy parts and continuous increase in output, the aluminum electrolysis coloring technology will surely be more widely developed and applied.
(A) electrolytic coloring method Electrolytic coloring method according to the characteristics of its hair color, can be divided into one step hair color and two hair color two. In the meantime, one-step hair color, also known as all hair color or natural hair color, is the method of anodizing aluminum and aluminum alloy parts in organic acids to obtain a colored oxide film, and there are also specific aluminum alloys that are colored in general anodizing. There are three conditions in this method: one is anodizing and coloring in organic acid electrolytic solution, one is alloy electrochromism method, also called natural coloring method, and the other is aluminum alloy organic acid solution cathodic electrolysis. Coloring. Regardless of the coloring, the aluminum alloy is colored in one electrolysis in various electrolyte solutions and is in one step. The one-step electrolysis coloring technique has a narrow scale, the operating conditions are relatively strict and disorderly, and the color of the film layer is greatly influenced by the data type, the electrolyte composition, and the operation skills, and thus is subject to certain restrictions.
The two-step coloring method is anodization and coloring of aluminum. The process is divided into two steps. First, the aluminum and aluminum alloy parts are first oxidized and filmed by a common anodizing method. Then coloring, coloring method is divided into adsorption and electrolytic coloring method.
Therefore, the electrolytic coloring treatment of aluminum and aluminum alloys is divided into three major categories from the coloring method: adsorption coloring, electrolytic coloring, and natural coloring.
(B) Comparison of several electrolytic coloring methods There are several kinds of electrolytic coloring methods for aluminum and aluminum alloys, and each has its own characteristics. However, as long as the functions of the film, the coloring skills and equipment, and the production cost, etc. In contrast, we can select a more appropriate method based on the actual production conditions and the demand for goods.
1. The function of aluminum and aluminum alloy electrolytic color film contrasts from the color, the color type of adsorption color method is more complete and beautiful, and the color of the other two methods is comparatively harmonized, but the contrast of the color type and the series is less. As a large number of applied profiles, the firmness and stability of the color are very important factors, and the degree of coloration and stability of the adsorptive coloration is poor, and the contrast of electrolytic coloring is good. Natural color (generally colored) is preferred. The good reason has a lot to do with the principle of coloration and the way in which "pigments" are stored. See Figure 4-1. From Figure 4-1, it can be seen that the adsorption pigment pigment is adsorbed on the surface of the film hole, so it is simply lost, or faded or discolored by the effect of strong light, strong heat, and electrolysis. The colored pigments accumulate at the bottom of the film pores, and the color shade and firmness of the color are related to the amount of accumulated pigments and the ability to seal the pores. The whole coloring method of the paint is combined with the three kinds of coloring principles to suggest a film layer, so it is more solid and stable.
The other functions of the membrane are shown in Table 4-1.
It can also be seen from Table 4-1 that the fineness and corrosion resistance of the film by adsorption coloring method can be good, but the wear resistance is poor, and it is only suitable for the decoration of indoor decoration materials and daily-use department stores or skilled art products. .
Electrochromic color film contrast fine, wear resistance, corrosion resistance, light resistance, heat-resistant features are excellent, especially the corrosion of the strength of mortar cement, it is more suitable for the construction of the door frames, windows and other profiles. Natural hair color film is better, the film is very fine, wear resistance, corrosion resistance, light resistance, heat resistance is also very good, but the function of mortar cement is less than the electrolytic color film. 2. The skills of the three kinds of coloring methods and the equipment's ability to absorb the coloring method are simpler, the procedures are less, the equipment is also simple and easy to make, and the investment is less. Electrochromism is relatively messy. Two sets of power equipment and oxidative coloring equipment are required. The structure is not complicated, but the capital contribution is relatively high, and the capital contribution is large at one time. Natural hair color is in between the two, the process is not much, equipment investment is not too large.
3 production costs from the cost of thinking, the lower cost of adsorption method, electrolytic coloring method is higher, and natural hair color method is higher, mainly because the electrolyte is more expensive organic acids and other reagents. In addition, color electrolysis is high, and electricity consumption is relatively large.
As can be seen from the above, the three electrolytic coloring techniques each have their own characteristics, advantages and disadvantages, so they should be selected based on the actual conditions and needs. In general, the method of adsorption and coloring is mostly used in indoor decoration and production of common furniture and finished products. Electrolytic coloring is mostly used in building profiles. The color film of natural hair color is superior, but the cost is high and it can only be used in occasions with high demand. If we can reduce the cost, especially the power consumption, there is a broader application perspective.
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