[China Aluminum Industry] aluminum alloy castings have been widely used, in order to better use and improve the quality of aluminum alloy castings, we can improve the quality and surface usage rate of aluminum alloy castings through some surface treatment methods. Its common aluminum alloy casting surface treatment method has the following five kinds. 1. Electrochemical surface strengthening of aluminum and its alloys The process, properties, morphology, composition and structure of the ceramic-like amorphous composite conversion film were deposited by anodization of aluminum and its alloys in a neutral system, and the film formation process and mechanism of the film layer were preliminarily discussed. The results of the process study show that in the Na_2WO_4 neutral mixed system, the concentration of the film forming accelerator is controlled to be 2.5 to 3.0 g/l, the concentration of the complex film former is 1.5 to 3.0 g/l, and the concentration of Na_2WO_4 is 0.5 to 0.8. g / l, the peak current density of 6 - 12A/dm - 2, weakly stirred, you can get a complete and uniform, good gloss gray inorganic inorganic non-metallic film. The film thickness is 5 - 10μm, microhardness is 300 - 540HV, excellent corrosion resistance. The neutral system has a good adaptability to aluminum alloys. Films can be better formed on various series of aluminum alloys such as anti-rust aluminum and forged aluminum. 2, aluminum and aluminum alloy environmental chemical polishing It has been determined that a new environmentally friendly chemical polishing technology based on phosphoric acid-sulfuric acid will be developed. This technology will achieve zero emission of NOx and overcome the quality defects existing in similar technologies. The key to the new technology is to add some special compounds to the base fluid to replace nitric acid. To do this, it is first necessary to analyze the tribasic acid chemical polishing process of aluminum, and it is particularly important to study the effect of nitric acid. The main role of nitric acid in chemical polishing of aluminum is to suppress pitting and increase the brightness of polishing. In combination with the chemical polishing test in simple phosphoric acid-monosulfuric acid, it is believed that the addition of special substances in monosulfuric acid should be able to inhibit pitting, slow overall corrosion, and must have good leveling and brightening effects. 3, aluminum alkaline electrolytic polishing process The alkaline polishing solution system was studied and the effects of corrosion inhibitors, viscosity modifiers, etc. on the polishing effect were compared. An alkaline solution system with good polishing effect was successfully obtained, and the operating temperature was lowered and the solution was prolonged for the first time. Lifetime, additive that also improves the polishing effect. The experimental results show that adding proper additives in NaOH solution can produce good polishing effect. The exploratory experiment also found that: after the DC constant voltage electrolytic polishing with glucose NaOH solution under certain conditions, the surface reflectivity of aluminum can reach 90%, but due to the experimental instability factors, pending further study. The feasibility of using DC pulse electrolysis polishing to polish aluminum under alkaline conditions was explored. The results show that the pulsed electrolytic polishing method can achieve the leveling effect of DC constant voltage electrolytic polishing, but its leveling speed is slow. 4, YL112 aluminum alloy surface treatment process technology YL112 aluminum alloy is widely used in structural parts of automobiles and motorcycles. The material needs to be surface treated prior to application to increase its corrosion resistance and form a surface layer that is easily combined with the organic coating to facilitate subsequent surfaces. 5, aluminum phosphating The effects of accelerators, fluorides, Mn2+, Ni2+, Zn2+, PO4, and Fe2+ on the phosphating process of aluminum were studied in detail by means of SEM, XRD, potential-time curve and film weight change. Studies have shown that yttrium nitrate has good water solubility, low dosage, and rapid film formation, and is an effective promoter of aluminum phosphating: Fluoride can promote film formation, increase film weight, and refine grains; Mn2+, Ni2+ can significantly Grain refinement makes the phosphating film uniform and dense and can improve the appearance of the phosphating film. When the Zn2+ concentration is low, film formation or film formation cannot be made worse. 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