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2020.11.23
Recently, many people are very interested in how to ensure the smooth surface of aluminum alloy castings and the actual effect of grinding yarn, and how to make such inclined surfaces on aluminum alloy. Here we will introduce you 5 common surface treatment technology of aluminum alloy die casting.
According to SEM, XRD, potential difference time curve and film weight transformation, the hazards of vulcanization accelerator, chloride, Mn2 +, Ni2 +, Zn2 +, PO4. And Fe2 + on the whole phosphating process of aluminum profile were studied in detail. The results show that guanidine nitrate has the characteristics of good water solubility, low consumption and rapid film formation, which is a reasonable vulcanization accelerator for aluminum profile phosphating. Chloride can promote the film formation, increase the film weight, optimize the crystal. Mn2 +, Ni2 +, can significantly optimize the crystal, make the phosphating film uniform, high density and improve the appearance of the phosphating film. When the concentration of Zn2 + is low, the film can not be formed or the film is poor. With the increase of Zn2 + concentration, the film weight increases. The composition of PO4 is very harmful to the phosphating film, which can improve PO4. The composition makes the phosphating film improve again.
The scientific research on alkaline polishing solution system was carried out. Compared with the harm of desulfurizer and viscosity agent to the actual effect of grinding and polishing, the alkaline solution system with very good polishing effect was obtained, and the preservative which can reduce the working temperature, increase the service life of solution and improve the actual effect of grinding and polishing is obtained for the first time. The experimental results show that adding appropriate preservative in NaOH solution can produce good polishing effect.
The exploratory test also found that the reflectivity of aluminum surface can reach 90% after electrolytic polishing with glucose NaOH solution under some standards. However, due to the unstable factors in the test, further scientific research is needed. This paper explores the feasibility analysis of using AC monopulse electropolishing method to polish aluminum profile under alkaline standard. The results show that the actual leveling effect of AC constant current source electrolytic polishing can be achieved by using monopulse electrolytic polishing method, but its leveling speed is relatively slow.
It is clear to develop and design the application of energy-saving chemical polishing technology based on phosphoric acid hydrochloric acid. This technology should achieve zero emission of NOx and get rid of the quality defects of similar technologies in the past. The key to the application of the new technology is to replace nitric acid with some chemicals with special effects in the base solution. Therefore, it is necessary to analyze the whole process of aluminum tri acid chemical polishing, especially the key scientific research on the effect of nitric acid. The key function of nitric acid in aluminum chemical polishing is to inhibit the point corrosion and improve the polishing gloss. The chemical polishing experiment in simple phosphoric acid hydrochloric acid shows that the unique chemical substance added in phosphoric acid hydrochloric acid can inhibit point corrosion and alleviate all-round corrosion. In addition, it must have good smooth and bright practical effect.
The process, properties, morphology, composition and structure of ceramic like amorphous composite conversion film formed by anodizing of aluminum and its alloy in neutral system were discussed. The results show that in the neutral mixed system of nazhu2wo ﹤ 4, the concentration of film-forming promoter is 2.5-3.0g/l, the concentration of complexing agent is 1.5-3.0g/l, the concentration of nazhu2wo ﹤ 4 is 0.5-0.8g/l, the peak current density is 6-12a / DM ~ 2, and the gray series inorganic non-metallic films with good luster can be obtained by weak stirring. The thickness of the film is 5-10 μ m, the microhardness is 300-540hv, and the corrosion resistance is excellent. The neutral system has good adaptability to aluminum alloy. The film can be formed on the aluminum alloy of various series products such as antirust treated aluminum and forged aluminum.
YL112 aluminum alloy is widely used in automobile parts. The surface treatment must be carried out before the raw material is used to improve its corrosion resistance and produce a surface layer which is very easy to fuse with the organic coating to facilitate the subsequent surface.