China Die Casting Supplier Introduces The Strategy Of Aluminum
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China Die Casting Supplier introduces four commonly used aluminum alloy die-casting electroplating methods as follows:
1. Phosphating of aluminum: through SEM, XRD, potential-time curve, film weight change and other methods, the effects of accelerators, fluoride, Mn2+, Ni2+, Zn2+, PO4, Fe2+, etc. on aluminum phosphating are detailed the study. The results show that: Guanidine nitrate has the characteristics of good water solubility, low dosage and fast film formation. It is an effective aluminum phosphating accelerator: fluoride can promote film formation, increase film weight, and refine grain; Mn2+, Ni2+ can Obviously refine the crystal grains, make the phosphating film uniform and compact, and improve the appearance of the phosphating film; when the Zn2+ concentration is low, the film cannot be formed, and the film formation is poor. As the Zn2+ concentration increases, the O4 content of the film is increased, making the phosphating film heavy PO4 Increase and increase the content of PO4. The added amount increases the weight of the phosphating film.
2. Alkaline electrolytic polishing process of aluminum liquid: The alkaline polishing liquid system was studied, and the effects of corrosion inhibitors and viscosity modifiers on the polishing effect of aluminum liquid were compared, and the alkaline of zinc-aluminum die castings was successfully obtained. Polishing process system, which has a good polishing effect, and for the first time an additive that can reduce the operating temperature, extend the service life of the polishing liquid, and improve the polishing effect. The test results show that good polishing effect can be obtained by adding appropriate additives to NaOH solution; exploratory experiments also found that: under certain conditions, using glucose NaOH solution for DC constant voltage electrolytic polishing, the reflectivity of the aluminum surface can reach 90 % Above, but there are still unstable factors in its reflectivity, which needs to be further studied. The feasibility of using DC pulse electrolytic polishing technology for alkaline polishing of aluminum is discussed. The results show that: pulse electrolytic polishing technology can achieve the effect of DC constant voltage electrolytic polishing, but its polishing speed is slow;
3. Environmentally-friendly chemical polishing of aluminum and aluminum alloys: research and develop new environmentally-friendly chemical polishing technologies, using phosphoric acid monosulfuric acid as the base fluid to achieve zero emission of nitrogen oxides and overcome the quality problems of similar technologies in the past. The key to this new technology is to add special action compounds to the base fluid to replace nitric acid. Therefore, it is first necessary to analyze the triacid chemical polishing process of aluminum, especially to study the effect of nitric acid. In aluminum chemical polishing, the main function of nitric acid is to inhibit pitting corrosion and improve polishing brightness. Through chemical polishing experiments on monosulfuric acid, phosphoric acid and sulfuric acid, it is believed that adding special substances to phosphoric acid and sulfuric acid can inhibit pitting corrosion and slow down overall corrosion, while requiring it to have good smoothness and brightness.
4. Electrochemical surface strengthening treatment of aluminum and its alloys: the process, performance, morphology, composition and structure of ceramic-like amorphous composite conversion coatings prepared by anodic oxidation of aluminum and its alloys in a neutral system, as well as the formation process of the film And the mechanism has been preliminarily discussed. The experimental results show that in the Na_2WO_4 neutral mixing system, the concentration of the film-forming accelerator is controlled to be 2.5-3.0g/l, the concentration of the film-forming aid is 1.5-3.0g/l, and the concentration of the film-forming aid is 6 -12A/dm-2, uniform, smooth and uniform gray series inorganic non-metallic film can be obtained through weak stirring. The film thickness is 5-10 microns, the microhardness is 300-540HV, and it has excellent corrosion resistance. The invention has good adaptability to aluminum alloys, and multiple series of aluminum alloys, such as rust-proof aluminum and forged aluminum, can form a good film.
Through the above introduction, Aluminum Die Casting Factory hopes that you can simply refer to the content of this article in future use.