Surface treatment of aluminum alloy after die casting

There are several methods for surface treatment of aluminum alloy after die casting:

1, aluminum phosphating. The accelerant, fluoride, Mn2+, Ni2+, Zn2+ and PO4 were studied in detail by means of SEM, XRD, potential-time curve and film weight change. And Fe2+ on the phosphating process of aluminum.

2. Alkaline electrolytic polishing process of aluminum. Adding proper additives to NaOH solution can produce good polishing effect. The exploratory experiment also found that under certain conditions, the surface reflectivity of aluminum can reach 90% after DC constant pressure electrolytic polishing with NaOH solution of glucose.

3. Environmentally friendly chemical polishing of aluminum and aluminum alloys. This technology should realize zero emission of nitrogen oxides and overcome the quality defects of similar technologies in the past. The key of the new technology is to add some special compounds to the basic solution instead of nitric acid. Therefore, it is necessary to analyze the chemical polishing process of aluminum, especially the role of nitric acid.

4. Electrochemical surface strengthening treatment of aluminum and its alloys. The process, properties, morphology, composition and structure of ceramic-like amorphous composite conversion film formed by anodic oxidation deposition of aluminum and its alloys in neutral system are discussed, and the film forming process and mechanism are preliminarily discussed. The neutral system has good adaptability to aluminum alloys, and can form films on various series of aluminum alloys such as antirust aluminum and deformed aluminum.

5. Surface treatment technology of YL 1 12 aluminum alloy. YL 1 12 aluminum alloy is widely used in the structural parts of automobiles and motorcycles. Before application, the material needs surface treatment to improve its corrosion resistance, and form a surface layer that is easy to combine with the organic coating to facilitate the subsequent surface.