Blueing
Author: Robby
Bluing is a process of forming a blue oxide film on the metal surface through chemical reaction, mainly used to improve the durability and service life of metal products.
The specific steps of the bluing process include: firstly, removing oil, rust and impurities from the surface of the workpiece, and then carrying out the necessary cutting process to remove burrs and sharp edges to improve the surface quality. Next, an acid solution is used to remove the oxide film from the surface of the workpiece, exposing the fresh metal surface for oxidation. The workpiece is placed in a solution containing an oxidising agent, which forms an oxide film on the surface of the workpiece through a chemical reaction. Finally, the surface of the workpiece is rinsed with water to remove residual chemicals and impurities, and a passivation film is formed on the surface of the workpiece to improve corrosion resistance.
The history of bluing can be traced back to ancient times, and was initially used to prevent rust on weapons. With the development of technology, the bluing process continues to improve, widely used in a variety of metal products surface treatment. In the field of light industry, such as bicycles, motorbikes, electrical appliances and other metal products in the surface treatment, the blue process is widely used. In the field of heavy industry, such as ships, petrochemical, electric power and other industries of metal products corrosion treatment, the blue process also plays an important role. Due to its unique aesthetic effect, the bluing process is also applied to the surface treatment of some artworks and handicrafts.