In the process of powder storage, transportation and use, it is often hoped that the nano-aluminum powder exhibits low activity and is less affected by external environmental factors (temperature, humidity, etc.), so that the product has stable performance for a long time. On the other hand, it is desirable to exhibit high activity in solid rocket propellants to obtain high energy release rate and superior combustion efficiency. Therefore, the research on the activity control and antioxidant properties of nano-aluminum powder is a complex and fundamental problem. In the process of producing nano metal powder, Hongwu Nano makes a passivation layer/oxide film on the surface of the particles. The existence of this oxide film enables the nano metal particles to be protected and the stability is improved.

What is a passivation layer?
The passivation layer is that part that is passivated. Passivation is a method that converts the metal surface into a state that is not easily oxidized and delays the corrosion rate of the metal.
The mechanism of passivation can be explained by thin film theory, that is, passivation is considered to be due to the action of metal and oxidizing substances, and a very thin, dense, well-covered, and firmly adsorbed metal surface is formed on the metal surface during the action. passivation film. This film exists as a separate phase, usually a compound of metal oxides. It plays the role of completely separating the metal from the external medium, preventing the metal from contacting with the external medium, so as to protect the nano-metal particles.