In the automotive aluminum die casting industry, aluminum alloy die castings occupy a large share. Most aluminum alloy die castings in the automotive die casting industry can be used only after polishing. There are many methods for polishin...
In the automotive aluminum die casting industry, aluminum alloy die castings occupy a large share. Most aluminum alloy die castings in the automotive die casting industry can be used only after polishing.
There are many methods for polishing aluminum alloy die castings, and the environment-friendly polishing technology with phosphoric acid sulfuric acid as the base solution can be used. This technology is to achieve zero NOx emission in advance and overcome the quality defects existing in previous similar technologies. The key of this technology is to add some compounds with special effects to the base solution to replace nitric acid. Therefore, it is necessary to analyze the three acid chemical polishing process of aluminum, the most important of which is to study the role of nitric acid. The main function of nitric acid in aluminum chemical polishing is to inhibit pitting corrosion, so as to improve the degree of polishing. Summarizing the chemical polishing test in pure phosphoric acid sulfuric acid, we can know that adding special substances to phosphoric acid sulfuric acid can inhibit pitting corrosion and slow down the overall corrosion. At the same time, it has a very good leveling and brightening effect.
