For this reason, we must first analyze the three-acid chemical polishing process of aluminum, especially the role of nitric acid. The alkaline electropolishing process of aluminum alloy die castings has been studied in the alkaline polishing liquid system, and the speed is relatively slow.. The key to the new technology is to add some special effect compounds to the base fluid instead of nitric acid. Combined with a simple chemical polishing test of monophosphoric acid, it can be considered that the special substances added to monophosphoric acid should be able to inhibit pitting corrosion and reduce general corrosion, and non-ferrous metals must have better leveling and brightening effects. defect.

In the copper casting process, the surface non-ferrous metal process is very rich and diverse, and the surface effect of the product is relatively beautiful. The influence of corrosives and tackifiers on the polishing effect has successfully obtained an alkaline solution system with good polishing effect, and obtained additives that can reduce the working temperature, extend the service life of the solution and maintain stability at the same time. Time improves the polishing effect. The main role of nitric acid in the chemical polishing of aluminum is to inhibit pitting corrosion and improve polishing brightness. The feasibility of using DC pulse electropolishing method to polish aluminum under alkaline conditions was explored. The China Electric vehicle parts results show that the pulse electropolishing method can achieve the leveling effect of DC constant piezoelectric polishing, but its flattening speed is slower.

When used, it is mainly used for glucose under certain conditions DC constant piezoelectric polishing in NaOH solution can achieve 90% reflectivity on the aluminum surface, but due to the instability of the experiment, further research is needed.Effective addition of non-ferrous metal additives to copper castings in solution can produce better polishing effects.In the process of determining the development of copper castings, environmentally friendly chemical polishing technology based on non-ferrous metal phosphoric acid monosulfuric acid is mainly used in the production of copper castings. When using this technology, its technology must achieve zero NOx emissions and overcome the quality of similar technologies in the past