Two Polishing Processes for Aluminum Alloy Die Castings
Sat May 20 15:41:04 CST 2023
Alkaline electrolytic polishing process of aluminum alloy die casting
The research on the alkaline polishing solution system was carried out, and the influence of corrosion inhibitors and viscosity agents on the polishing effect was compared, and an alkaline solution system with good polishing effect was successfully obtained, and it was the first time to obtain a solution that can reduce the operating temperature and prolong the use of the solution. It is an additive that can improve the polishing effect at the same time. The experimental results show that adding appropriate additives in NaOH solution can produce good polishing effect. Exploratory experiments also found that after direct current constant voltage electrolytic polishing with glucose NaOH solution under certain conditions, the reflectivity of the aluminum surface can reach 90%, but due to the unstable factors in the experiment, further research is needed. The feasibility of using DC pulse electropolishing method to polish aluminum under alkaline conditions was explored. The results showed that the pulse electropolishing method can achieve the leveling effect of DC constant voltage electropolishing, but the leveling speed is slow.
Aluminum Alloy Die Casting and Aluminum Alloy Environment-friendly Chemical Polishing
It is determined to develop an environmentally friendly new chemical polishing technology based on phosphoric acid monosulfuric acid. This technology must achieve zero emission of NOx and overcome the quality defects of similar technologies in the past. The key to the new technology is to add some compounds with special effects to replace nitric acid in the base fluid. For this reason, it is first necessary to analyze the three-acid chemical polishing process of aluminum, especially the effect 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 simple phosphoric acid-sulfuric acid, it is considered that the special substances added in phosphoric acid-sulfuric acid should be able to inhibit pitting corrosion and slow down general corrosion, and must have good leveling and brightening effects.