As people's living standards improve, so does their demand for home decoration, seeking not only excellent performance but also vibrant colors. Powder coating is on the rise. It boasts great performance and satisfying colors. Unfortunately, the thick powder often hides the luster of the metal. Shenzhen Anodizing Dye is the perfect solution to this issue. It preserves the metallic sheen and offers brilliant colors. It's suitable for home appliances, cars, brands, and is an excellent choice for home decor.
Shenzhen Anodizing
1. Oxidation Dyeing Principle
It is well-known that anodized films consist of numerous hexagonal cells perpendicular to the metal surface, with each cell containing a membrane pore and possessing a strong adsorption capacity. When aluminum oxide products are immersed in a dye solution, dye molecules diffuse into the pores of the oxide film, forming covalent bonds and dissociation with the oxide film subunits. The bond formation is reversible and can undergo desorption under certain conditions. Therefore, after dyeing, the pores need to be sealed to fix the dye within the holes, thereby enhancing the oxide film's corrosion and wear resistance.
2. The Effect of Anodizing Process on Dyeing
During the anodizing dyeing process, dyeing defects caused by the anodizing process are common. The uniformity of the oxide film thickness and porosity is the premise and foundation for achieving a uniform color in dyeing. To obtain a uniform oxide film, sufficient circulation, cooling capacity, and good conductivity must be ensured. Additionally, it is the stability of the oxidation process.
The sulfuric acid concentration should be maintained between 180-200g/L. Higher concentrations of sulfuric acid can accelerate the dissolution reaction of the oxide film, which is beneficial for the expansion of pores and makes dyeing easier.
Aluminum ion concentration should be maintained between 5-15g/L. When the concentration is below 5g/L, the adsorption capacity of the oxide film decreases, affecting the coloring speed. When the concentration exceeds 15g/L, it impacts the uniformity of the oxide film, leading to irregular oxidation.
When the oxidation temperature is controlled around 20℃, the bath temperature has a significant impact on the dyeing process. If the temperature is too low, the pores of the oxidation film will be very dense, resulting in a明显 slower dyeing speed. If the temperature is too high, the oxidation film becomes loose and prone to flaking, which is not conducive to controlling the dyeing process. The temperature difference in the oxidation tank should be within 2℃.
Current density, 120-180A/m². When the current density is too high and the membrane thickness is fixed, the aluminum electrolysis time should be correspondingly shortened. This reduces the dissolution of the oxide film solution, making the membrane pores denser and extending the dyeing time. At the same time, the film is prone to powdering.
