Method of surface treatment of Aluminum Sheet
Aluminum Sheet used in industry, life is more, the surface can be the effect of treatment of decoration and protection, the other alloy after surface treatment of Aluminum Sheet has good conductivity, thermal conductivity, wear resistance, our customers get the recognition. What are the methods of surface treatment of alloy Aluminum Sheet? Chemical conversion coating on Aluminum Sheet processing, let the metal contact with specific corrosive liquid, under certain conditions on the surface of the metal ions in the outer corrosion liquid nucleus reaction, good adhesion on metal surface will form a layer of film. The chemical conversion process can remove the natural oxidation film of metal surface and form a corrosive oxidation film on the surface.
Another common anodizing method is to use Aluminum Sheet as an anode and place it in an electrolyte such as sulfuric acid to electrolyze the anode voltage so as to form a compact oxide film on the surface of Aluminum Sheet. The oxide film consists of a double layer of porous layers of dense barrier and columnar structures, and the performance of the oxide film is determined by the density of the membrane.
When the Aluminum Sheet is oxidized by anodic, it is necessary to choose the appropriate method to reduce the dissolution rate of the film and obtain thicker and denser oxide film. The common methods are formed under the conditions of low temperature and low temperature sulfuric acid concentration. The oxide film has a high resistance, which produces a large number of special lights during oxidation, so the dc oxidation current cannot be too large.
With the development of China's economy, the demand for Aluminum Sheets is increasing. But the quality of Aluminum Sheet is also has certain defects, production experience, production of Aluminum Sheet tend to have the phenomenon of brittle, so this is what causes, below small make up to tell you something about the causes, and how to change this phenomenon:
1, due to shunt bar is usually caused by poor convergence performance should be appropriately increased muscle and outside surface, reinforcement and reinforced the confluence of the length, or increase the compression ratios, the change of the die head pressure can change the die head straight length to adjust the material flow resistance; Different compression ratios can be selected to change the extrusion pressure in the mould design stage, but the compression ratio of the machine head should be adjusted to the compression ratio of the extruder. The melt pressure can be changed by changing the formula, adjusting the extrusion process parameters and adding the porous plate.
2. Insufficient pressure of die head. The pressure size of the die is determined directly by the compression ratio of the die, especially the length of the flat length of the die. The compression ratio of die head is too small or too short, which can result in the incompact product and affect the physical properties.
3. The design of the die section is unreasonable, especially the distribution of the internal tendon and the treatment of the interface Angle. This can result in stress concentration phenomenon, which needs to improve the design and eliminate the right Angle and acute Angle at the interface.
Note: don't wash hot plate (temperature more than 40 ° C), because the evaporation of water too fast is harmful to the surface of the lacquer that bake.
Special attention is required, please choose appropriate detergent, a basic principle is: must choose neutral detergent! Do not use strong alkaline detergents such as potassium hydroxide, sodium hydroxide or sodium carbonate, strong acid detergents, abrasion detergent and solving-free detergent.