• Categories:Industry knowledge
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• Time of issue:2020-07-13 17:14
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(Summary description)The effects of accelerant, fluoride, Mn2 +, Ni2 +, Zn2 +, PO4; and Fe2 + on the phosphating process of aluminum were studied by means of SEM, XRD, potential time curve and film weight change. The results show that when the concentration of Zn2 + and Zn2 + is low, the film can form dense film; The content of PO4 has a great influence on the weight of phosphating film, which increases PO4. The weight of phosphating film increases with the content of phosphate film.
The alkaline electrolytic polishing process of aluminum was studied. The effects of corrosion inhibitor and viscosity agent on the polishing effect were compared. The alkaline solution system with good polishing effect was successfully obtained. The additives which can reduce the operating temperature, prolong the service life of the solution and improve the polishing effect are obtained for the first time.
The experimental results show that adding appropriate additives into NaOH solution can produce good polishing effect. The exploratory experiment also found that the reflectivity of aluminum surface can reach 90% after DC constant voltage electrolytic polishing with glucose NaOH solution under certain conditions. However, due to the unstable factors in the experiment, further research is needed. The feasibility of DC pulse electropolishing in alkaline condition is explored. The results show that the leveling effect of DC constant voltage electrolytic polishing can be achieved, but the leveling speed is slow.
Environmental friendly chemical polishing of aluminum and aluminum alloy determined to develop a new environmental friendly chemical polishing technology based on phosphoric acid sulfuric acid. The technology should achieve zero emission of NOx and overcome the quality defects of previous similar technologies. The key of the new technology is to add some compounds with special functions in the base solution to replace nitric acid.
Therefore, it is necessary to analyze the three acid chemical polishing process of aluminum, especially the role of nitric acid. The main function of nitric acid in aluminum chemical polishing is to inhibit pitting corrosion and improve polishing brightness. Combined with the chemical polishing test in phosphoric acid - sulfuric acid, it is considered that the special material added in phosphoric acid - sulfuric acid should be able to inhibit the point corrosion and slow down the overall corrosion, at the same time, it must have good leveling and bright effect.
The process, properties, morphology, composition and structure of ceramic like amorphous composite conversion coating formed by anodic oxidation deposition of aluminum and its alloy in neutral system were studied.