Common aluminum alloy die casting treatment methods

Many science and technology house how to make aluminum alloy die-casting surface smooth Sanding effect, aluminum alloy how to make this arc surface is very interesting. Today, I will introduce five common surface treatment methods for aluminum alloy die-casting.
Method 1: Aluminum phosphating
The accelerant, fluoride were studied in detail by means of SEM, XRD, potential time curve and membrane weight change Mn2+，Ni2+，Zn2+，PO4； And Fe2+on aluminum phosphating process. The results show that guanidine nitrate has the characteristics of good water solubility, low dosage and fast film formation. It is an effective accelerator for aluminum phosphating: fluoride can promote film formation, increase film weight and refine grains; Mn2+, Ni2+can obviously refine grains and make phosphating film uniform The compact appearance of phosphating film can be improved; When the concentration of Zn2+is low, the film cannot be formed or the concentration of Zn2+increases and the film weight increases; PO4 content has great influence on the weight of phosphating film PO4. The content of phosphating film increases.
Method 2: Alkaline electrolytic polishing process of aluminum
The alkaline polishing solution systems were compared The influence of adhesive on polishing effect has successfully obtained a good alkaline solution system, which can reduce the operating temperature and prolong the service life of the solution An additive that can also improve the polishing effect. The experimental results show that adding appropriate additives in NaOH solution can produce good polishing effect.
The exploratory experiment also found that the surface reflectivity of aluminum can reach 90% after DC constant voltage electropolishing with glucose NaOH under certain conditions. However, due to the unstable factors in the experiment, further research is needed. The feasibility of DC pulse electrolytic polishing for aluminum in alkaline solution was discussed. The results show that the pulse electropolishing method can achieve the smoothing effect of DC constant voltage electropolishing, but the smoothing speed is slow.
3. Environmentally friendly chemical polishing of aluminum and aluminum alloy
A new environment-friendly chemical polishing technology based on phosphoric acid monosulfuric acid is determined to achieve zero NOx emission and overcome the quality defects of previous similar technologies. The key of the new technology is to add some compounds with special effects to the base solution to replace nitrate. Therefore, it is necessary to analyze the tri acid chemical polishing process of aluminum, especially the role of nitrate. The main role of nitrate in aluminum chemical polishing is to inhibit spot corrosion and improve polishing brightness. Combined with chemical polishing test in simple phosphate sulfate, special substances added in phosphate sulfate should be able to inhibit spot corrosion, slow down overall corrosion, and must have good leveling and light effects
Method 4: Electrochemical surface strengthening treatment of aluminum and its alloys
Aluminum and its alloys are anodized and deposited in neutral system to form ceramic amorphous composite conversion film. The film forming process and mechanism are preliminarily discussed in terms of performance, morphology, composition and structure.
The results of the process study show that_ 2WO_ In the 4 neutral mixed system, the concentration of film forming accelerator is controlled at 2.5 ～ 3.0g/l,
The concentration of composite membrane agent is 1.5 ～ 3.0g/l, Na_ 2WO_ 4. The concentration is 0.5~0.8g/l, and the peak current density is 6~12A/dm2. Weak stirring can be completely uniform Grey series inorganic non-metallic coatings have good glossiness of 5~10 μ m. The micro hardness is 300~540HV, with excellent corrosion resistance. The neutral system has good adaptability to aluminum alloy, and aluminum alloys such as rustproof aluminum and forged aluminum can better form films.
Method 5: Surface treatment technology of YL112 aluminum alloy
YL112 aluminum alloy is widely used in automobiles The structural components of a motorcycle. The material needs surface treatment before application to improve its corrosion resistance and form a surface layer that is easy to combine with the organic coating to promote the subsequent surface.