Electrophoresis process is a common process type in surface treatment of aluminum profiles, which usually refers to "anodic oxidation-electrophoretic treatment", that is, electrophoretic treatment after anodic oxidation, referred to as electrophoretic coating. Electrophoresis refers to the process of putting the extruded aluminum alloy into an electrophoresis tank and forming a dense resin film on its surface under the action of DC electric field. The electrophoresis process of aluminum profile includes four chemical reaction processes: electrophoresis, electrolysis, electrodeposition and electroosmosis. According to the different electrodes used in the preparation process, the electrophoretic process can be divided into anode electrophoretic coating and cathode electrophoretic coating.
As a common surface treatment process, powder spraying is to spray powder on the surface of metal materials by static electricity or pressure, and then melt and fluidize at high temperature to form a uniform, dense and smooth film. This treatment process has the characteristics of strong adhesion, corrosion resistance, protection and good decoration. Widely used in automobile industry, electrical insulation, corrosion-resistant chemical pumps, valves, cylinders, pipelines, outdoor steel components, steel furniture, castings and other surface coatings.
1. Thermosetting powder spraying
Thermosetting powder spraying is a common powder spraying method for aluminum profiles at present, and its main raw materials are polyester, epoxy, polyurethane and other polymer organic substances. In the baking process after spraying, the powder melts, flattens, polymerizes and crosslinks to form a hard, wear-resistant and corrosion-resistant coating.
2. Cold solid powder spraying
Cold curing powder spraying is a new environmental protection surface treatment method, and it has also become low temperature curing powder spraying. Its principle is similar to that of thermosetting powder spraying, but the curing conditions are different with different powder resin systems, generally curing at room temperature.
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