The commonly used alloy aluminum 6061, 7075, and cast aluminum A356 have good coloring effects.
There is no necessary connection between die casting and anodizing.
There are many types of cast aluminum, and it is not necessary to choose silicon-aluminum alloys (cast aluminum is divided into Al-Si series, AL-Cu series, AL-Mg series, AL-Zn series, etc., as well as those mixed with rare earth elements). Even if silicon-aluminum alloys are chosen, anodizing is not impossible. Generally speaking, alloy aluminum contains silicon elements to a greater or lesser extent, such as 6061 contains 0.4~0.8% silicon, 7075 contains 0.4% silicon, such silicon content has little effect on alloy anodizing (by the way, copper content has little effect on aluminum alloy anodizing, but copper and manganese have a great influence when hard oxidation and porcelain oxidation). However, when the silicon content in the alloy is large (>7%), it will have an impact on the anodizing of the alloy. These problems can be solved through the process (such as oxidation without direct current, but with pulsed current), which requires surface treatment manufacturers to have certain technical capabilities. Therefore, cast aluminum ≠ silicon-aluminum alloys cannot ≠ anodized.
Let's talk about coloring. Anodizing and coloring aluminum alloys are two different processes, which are different from the blueing of steel. Steel bluish is the blue color of the oxide film itself, while coloring is done immediately after anodizing, and the oxide film itself is colorless and transparent. The oxide film obtained by sulfuric acid anodization of aluminum alloy is suitable for dyeing, and now organic dyes are used for coloring, and then the oxide film is sealed after coloring. In addition, there are also heavy metal salts for electrolytic coloring, but it is more difficult to dye red according to the owner's requirements!
The process of chemical treatment of steel parts in a solution containing phosphoric acid to create a protective film that is difficult to dissolve in water on the surface of steel is called phosphating treatment!
It mainly has the following characteristics:
1. The surface of the phosphating film is gray or dark gray.
2. The phosphating film is filled, oiled or painted, and has good corrosion resistance under atmospheric conditions.
3. The adsorption capacity of the film layer is strong, and it is often used as the bottom layer of the coating.
4. Phosphating film has high electrical insulation.
5. After phosphating treatment, the mechanical properties, strength, and magnetic properties of the primary metal remain basically unchanged.
6. The phosphating film has good lubricating properties.
7. The surface of the nitriding parts can be protected by phosphating film.
8. The characteristics of phosphating film are that it can obtain a protective film on the inner surface of steel and steel surfaces with complex shapes.
9. The hardness and mechanical strength of the film layer have a certain brittleness.
Passivation generally refers to: in order to improve the protective performance and decorative performance of the galvanized layer, the plating is treated with a solution to form a film with high chemical stability on its surface. After passivation treatment, the protective performance and surface gloss of the galvanized layer can be improved.
Oxidation is generally divided into: oxidation of aluminum, aluminum alloy and steel parts, but the purpose that can be achieved is different from the solution used