1. Wire drawing processing technology
The main process of the technology is divided into three parts: de esterification, sand mill, and water washing. In the aluminum plate drawing process, the special coating technology after anodizing is generally achieved by using a stainless steel wire brush or scouring pad brush with a diameter of 0.1 millimeters, or by processing with a nylon sand belt. This can create a coating layer containing the metal component on the surface of the aluminum plate, clearly showing every fine wire trace, thus giving the metal matte a fine hair like luster. In recent years, an increasing number of aluminum plate products have adopted metal wire drawing technology for their metal shells, in order to achieve aesthetic and corrosion-resistant effects.
2. Etching treatment process
First, grind with jujube charcoal to remove grease and scratches, and grind to a matte surface. Then use screen printing to print the pattern, with ink models such as 80-39, 80-59, 80-49, etc. After printing the pattern, put it in an electric furnace for drying, then seal the back with instant tape, seal the edges with adhesive tape, and enter the corrosion process.
The formula for the corrosion solution of aluminum plate is as follows: 50% ferric chloride, 50% copper sulfate, an appropriate amount of water, and a temperature between 15-20 ° C. When the aluminum plate is corroded, it should be placed flat. During the corrosion process, reddish brown slag overflows from the pattern and should be removed with a brush at any time. A large number of bubbles will appear on the aluminum surface, and the slag will float up with the bubbles. The corrosion time of aluminum plate can be completed in about 15-20 minutes.
3. Electrophoretic coating process
Process flow: degreasing → hot water washing → water washing → neutralization → water washing → anodizing → water washing → electrolytic coloring → hot water washing → water washing → electrophoresis → water washing → drying.
On the basis of anodic oxidation, a water-soluble acrylic paint film is uniformly covered on the oxide film through electrophoresis, forming a composite film of anodic oxide film and acrylic paint film on the surface of the profile.
Aluminum sheet with a solid content of 7% to 9% and a temperature of 20-25 ℃ pH8.0～8.8、 An electrophoresis cell with a resistivity (20 ℃) of 1500-2500 Ω cm, a voltage (DC) of 80-25OV, and a current density of 15-50 A/m2 can be coated with a film thickness of 7-12 μ m after 1-3 minutes of electrophoresis.