Die casting aluminum alloy plating four kinds of surface treatment methods

【ALUMINIUM CHINA NETWORK】 1. Aluminium phosphide has been studied in detail using accelerators, fluoride, Mn2+, Ni2+, Zn2+, PO4, and Fe2+ for aluminum through the use of SEM, XRD, potential-time curves, and film weight changes. The effect of the phosphating process. 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. As the concentration of Zn2+ increases, the film weight increases the content of O4 to the phosphating film. The impact is greater, increase PO4. The content increased the weight of the phosphating film.

2. The alkaline electrolytic polishing process of aluminum was studied in the alkaline polishing solution system. Effects of corrosion inhibitors, viscosity agents, etc. on the polishing effect were compared, and an alkaline solution system with good polishing effect was successfully obtained and obtained for the first time. The additive can reduce the operating temperature, prolong the service life of the solution, and at the same time improve the polishing effect. The experimental results show that adding proper additives in NaOH solution can produce good polishing effect. Exploratory experiments have also found that: after the constant pressure electrolytic polishing with glucose in NaOH solution under certain conditions, the surface reflectance of aluminum can reach 90%, but due to the instability of the experimental 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.

3. Environmentally-friendly chemical polishing of aluminum and aluminum alloys The development of a new environmentally-friendly chemical polishing technology using phosphoric acid-sulfuric acid as a base fluid is required to achieve zero emission of NOx and to overcome 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 considered that special substances added in monosulfuric acid should be able to inhibit pitting corrosion and slow overall corrosion. At the same time, it must have good leveling and brightening effects. 4. Electricity 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 by chemical surface strengthening treatment of aluminum and its alloys. The film formation process and mechanism of the film layer were preliminarily discussed. The results of the process study showed that in the Na_2WO_4 neutral mixed system, the concentration of the film forming accelerator was controlled to 2.5 to 3.0 g/l, the concentration of the complex film former was 1.5 to 3.0 g/l, and the concentration of Na_2WO_4 was 0.5 to 0.8 g/l. The peak current density is 6 ~ 12A/dm~2, weak stirring, you can get a complete and uniform, good gloss gray inorganic inorganic non-metallic film. This film has a thickness of 5 to 10 μm and a microhardness of 300 to 540 HV, which is excellent in 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.

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