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This process is a chemical polishing process that uses H3PO4 and H2SO4 as base fluids. This process needs to achieve no NOx emissions and also needs to overcome some quality defects of similar technologies in the past. The main point of this technology is to add some to the base fluid. Compound to replace nitric acid.
For this reason, it is necessary to analyze the three-acid chemical polishing process of aluminum first, and focus on the role of nitric acid in this process. The main role of nitric acid in the aluminum chemical polishing process is to inhibit pitting corrosion and make the brightness after polishing better.
Combining this discovery with the chemical polishing test in pure H3PO4 and H2SO4, it is believed that it is necessary to add a substance to H3PO4 and H2SO4, which can inhibit pitting corrosion and slow down the overall corrosion. At the same time, it can also make the polished aluminum die-cast Substances with flatter parts and better brightness.