Mainly includes adjusting the aluminum ion content, moisture content, and the ratio of phosphoric acid to sulfuric acid in the polishing solution, and paying attention to temperature control and avoiding local crystallization. The specific measures are as follows: Adjust the aluminum ion content: In the three acid polishing process, when the aluminum ion level rises to 45g/L, it has significantly hindered the chemical reaction process. Polishing reaction 1 can be promoted by increasing the temperature, prolonging the polishing time, or adding new phosphoric acid and water. Control moisture content: Increasing the moisture content in chemical polishing solution will reduce the solubility of aluminum salts in phosphoric acid and sulfuric acid, leading to crystallization and precipitation. Therefore, it is necessary to control the moisture content appropriately to avoid excessive moisture. Adjust the ratio of phosphoric acid to sulfuric acid: Measure the net content of phosphoric acid and sulfuric acid in the polishing solution through laboratory analysis to ensure that the acid ratio is within the range of 1.5-3.0, in order to meet the needs of tri acid polishing. A low acid ratio can cause a decrease in the solubility of aluminum salts in the solution, leading to crystallization. Temperature control: When the temperature decreases, the solubility decreases, which can easily lead to crystallization. Therefore, maintaining an appropriate bath temperature is one of the important measures to prevent crystallization. Avoid local crystallization: To prevent excessive water ingress into the polishing tank solution in a short period of time or a decrease in temperature after the tank solution is stopped for a period of time, in order to reduce the occurrence of local crystallization. Through the above measures, the crystallization phenomenon of the three acid polishing tank can be effectively reduced, ensuring the smooth progress of the polishing process.
