Two Polishing Processes For Aluminum Alloy Die Castings

- May 04, 2019-

The surface technology of aluminum alloy die-casting parts is rich and varied, and the surface effect of aluminum alloy die-casting parts is very beautiful, and the surface effect is very beautiful. Let us look at the other two polishing processes of aluminum alloy die-casting parts.


1. Alkaline electropolishing process for aluminum alloy die castings


The research on the alkaline polishing solution system was carried out, and the effects of corrosion inhibitors and viscosity agents on the polishing effect were compared. The alkaline solution system with good polishing effect was successfully obtained, and the first time was to reduce the operating temperature and prolong the solution. An additive that has a long life and an improved polishing effect. The experimental results show that adding a suitable additive to the NaOH solution can produce a good polishing effect. Exploratory experiments also found that the surface reflectance of aluminum can reach 90% after DC constant pressure electropolishing with NaOH solution of glucose under certain conditions, but there are still unstable factors in the experiment, which needs further study. The feasibility of using DC pulse electropolishing method to polish aluminum under alkaline conditions was explored. The results show that the pulse electropolishing method can achieve the leveling effect of DC constant pressure electropolishing, but its flattening speed is slow.


2, aluminum alloy die-casting parts and aluminum alloy environmentally friendly chemical polishing


It is determined to develop a new environmentally friendly chemical polishing technology based on phosphoric acid monosulfate, which is to 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 special-effect compounds to the base fluid instead of nitric acid. To this end, it is first necessary to analyze the chemical polishing process of aluminum triacid, especially the role of nitric acid. The main role of nitric acid in the chemical polishing of aluminum is to suppress pitting corrosion and improve polishing brightness. Combined with the chemical polishing test in simple mono-phosphoric acid, it is believed that the special substances added in the mono-phosphoric acid should be able to suppress pitting corrosion and alleviate general corrosion, and must have better leveling and brightening effects.


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