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Al electrolytic alkaline polishing process

The alkaline polishing solution system was studied, and the effect of corrosion inhibitors, viscosity modifiers, etc. on the polishing effect was compared. Alkaline solution system with good polishing effect of zinc-aluminum die castings was successfully obtained, and the operating temperature was reduced for the first time. Additives that extend the service life of the solution while also improving the polishing effect. The aluminium profile manufacturers' 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 pressure 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 method 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 slower.
Aluminum and Aluminum Alloy Eco-friendly 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 compounds with special effects in 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 in particular to focus on the role 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.
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 initially discussed. The results of the process study showed that in the Na_2WO_4 neutral mixed system, the concentration of the film formation 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 Na_2WO_4 concentration 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.

 

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