Chemical Polishing Technology of Aluminum Articles
Chemical polishing is a method of surface refinishing and brightening using chemical reaction and electrochemical reaction. It uses a chemical agent, usually an acid and an electrolyte, to make the surface of aluminum articles smoother, brighter, and more corrosion resistant.
Chemical polishing of aluminum articles is generally used when the requirement of surface quality is very strict. It can remove the unevenness of casting surface, the sundries on surface, and the cross-sectional burr of machining allowance. It can also improve the overall gloss of nooks and crannies. In addition, it can also improve the mechanical properties of aluminum parts and prevent corrosion and discoloration of aluminum parts in the later use.
The chemical polishing technology of aluminum articles includes mechanical polishing, chemical polishing and electrolytic polishing. The mechanical polishing process uses mechanical friction to remove the oxide film on the surface of the aluminum part. After mechanical polishing, the aluminum article is polished by dipping it in an appropriate acid. Then the electrochemical polishing is adopted to further remove the oxide film on the surface of the aluminum article and finally, brighten the surface of the aluminum article.
The chemical polishing technology of aluminum articles is a very complex process and requires skilled technicians with rich experience. Firstly, the surface of the aluminum article needs to be scoured and brushed to remove the burrs, dirt and dust on the surface. Then, the surface of the aluminum article is polished by mechanical polishing and chemical polishing. Then the surface of the aluminum article is immersed in a special electrolyte, and through the electrolytic polishing, the oxidized particles of the surface of the aluminum article are removed and the surface of the article is brightened.
The brightness of the aluminum article surface depends on several factors, such as the properties of the electrolyte, the potential applied, the temperature of the electrolyte, and the length of the time of electrolytic polishing. In addition, different surface states require different finishing processes, which should be determined according to the properties of the aluminum article.
To sum up, chemical polishing technology of aluminum articles has wide application and good effect. Its surface finish is fine and bright, and it is not easy to corrode and discolor in later use. However, due to the complexity of the process and the need for skilled technicians, chemical polishing technology of aluminum articles is only suitable for high-end and high-precision aluminum parts, and the cost is relatively expensive.
