[China Aluminum Industry Network] Aluminum surface treatment methods are generally anodizing, electrophoretic coating and powder coating three treatment methods, each have their own advantages, occupy a considerable market share.
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Powder spraying has the following significant advantages:
1 The process is relatively simple, mainly due to the improvement of the automatic precision of major equipment in the production process. Microcomputer control can be achieved for some major technical parameters, effectively reducing the difficulty of process operation, and greatly reducing the number of auxiliary equipment;
2 The rate of finished products is high. Under normal circumstances, if all measures are properly implemented, the generation of defective products can be controlled to a greater extent;
3 The energy consumption is significantly reduced. In the production process of ordinary anodizing and electrophoretic coating, the consumption of water and electricity is considerable, especially in the oxidation process. Rectifier output current can reach between 8000 ~ 11000A, voltage between 15 ~ 17.5V, coupled with the heat loss of the machine itself, need to keep cooling water circulation, ton power consumption is often around 1000 degrees, At the same time, the reduction of auxiliary facilities can also reduce some power consumption;
4 The degree of pollution to water and atmosphere is reduced. The use of caustic soda, sulfuric acid and other liquid organic solvents is no longer used to reduce water and air pollution. It also effectively improves the competitiveness of aluminum profiles and plastic steel profiles as environmental protection products, and accordingly reduces Some production costs;
5 The labor intensity of workers has been significantly reduced. Due to the use of automated assembly line operations, the feeding methods and the use of fixtures have been significantly simplified, which has increased production efficiency and reduced labor intensity.
6 The requirements for the surface quality of wool are significantly reduced. The powder coating can completely cover the extrusion lines on the surface of the profile, masking the flaws on the surface of a part of the aluminum profile, and improving the surface quality of the finished aluminum profile.
7 Some physical properties of the coating are significantly improved compared to other surface treatments such as hardness, abrasion resistance, and acid resistance, which can effectively extend the service life of the aluminum profile.
Powder coating adopts powder coating. Electrostatic spraying is used in the process. The role of the friction spray gun is used. Under the influence of accelerated wind, the powder particles are carried positively when they are sprayed out of the gun body, and they come into contact with negatively charged profiles. Electrostatic adsorption followed by high temperature curing. It also enhances the coating's strength and prevents the paint film from falling off.
From the point of view of the process itself, it has a very high technological composition, and the deployment of paints with different colors will produce decorative effects of different colors. It is more in line with the needs of interior decoration, and it is also in line with the development trend of aluminum profiles in the construction industry. Consistent. In particular, the combined use of spray profiles and thermal break bridges has made them more fashionable, enabling powder sprayed profiles to have more room for development and also being unreplaceable by other processing methods.
Application of Powder Spraying in Surface Treatment of Aluminum Profiles