Chemical Solution Additives

Before chemical polishing, pretreatment of the material surface is a crucial step. The purpose of pretreatment is to remove oil stains, scale and other impurities on the surface of the material to ensure the smooth progress of the chemical polishing process. Pretreatment methods include chemical cleaning and mechanical cleaning.

The preparation of polishing solution is the core part of the chemical polishing process. The polishing solution consists of a base liquid and chemical additives. The base liquid is usually water or an organic solvent. The additives are specific chemicals selected according to different materials, such as nitric acid, oxalic acid, potassium aluminum sulfate, etc.

Polishing treatment is the core step of the chemical polishing process. In this process, the material is soaked in a prepared polishing solution, and particles and uneven parts on the surface are removed through a chemical reaction.
● Soaking time: The length of polishing time depends on the nature of the material and surface requirements. Generally speaking, polishing time ranges from a few minutes to dozens of minutes.
● Solution temperature: Temperature has a significant impact on the polishing effect. Higher temperatures can speed up chemical reactions and improve polishing efficiency, but they also increase the risk of corrosion. Commonly used polishing temperatures are between 20°C and 60°C.
● Solution stirring: In order to ensure uniform polishing effect, the solution usually needs to be stirred. Stirring can prevent sediments in the polishing solution from affecting the polishing effect.

After the polishing process, the acid and alkali components in the polishing solution may remain on the surface of the material, which needs to be neutralized. Neutralization treatment is usually performed using a dilute alkaline solution or a dilute acid solution.
● Neutralization step: Soak the polished material in a neutralizing solution. Generally, dilute sodium hydroxide solution is used to neutralize acidic residues, and dilute acetic acid solution is used to neutralize alkaline residues.
● Cleaning steps: After neutralization, a large amount of water needs to be used to clean the surface of the material to completely remove residual chemicals and prevent secondary pollution of the material.

The final step is to post-process and inspect the polished material to ensure that the polishing effect reaches the expected standard.
● Drying process: The cleaned materials need to be dried to prevent corrosion caused by moisture residue. Drying methods include natural drying, hot air drying and vacuum drying.
● Detection steps: Detect the polishing effect through visual inspection and surface finish measurement. If necessary, microscopic inspection is required to ensure that there are no residual impurities and uneven parts on the surface.