The reaction between aluminum electrodes and fluoride

In recent times, the art of chemistry has become more and more refined, and it is particularly detailed in the study of the reaction of various materials. Aluminum electrodes are widely used in the field of electrochemistry because of their light weight and excellent conductivity. And fluoride is active, and when it meets aluminum electrodes, it is often wonderful.

When the aluminum electrode encounters fluoride, at first, the alumina film on its surface encounters fluoride ions, which is eroded. Cover fluoride ions have strong coordination power and can complex with aluminum ions to break this protective film. When the film is broken, the aluminum body is then confronted with fluoride. At the beginning of the

reaction, aluminum loses its three electrons, forming aluminum ions that dissolve into the liquid phase, and fluoride ions tend to adhere to it, resulting in various aluminum fluoride complex ions. Among them, common ones are hexafluoroaluminate ions. The reaction formula is roughly as follows:\ (Al + 6F ^ -\ rightarrow [AlF_6] ^ {3 - } + 3e ^-\) 。

Looking at the reaction phenomenon, it can be seen that the solution gradually becomes slightly blue, and there are bubbles escaping. During the edge reaction, there may be hydrogen ions that gain electrons into hydrogen bubbles. And the color of the solution may change due to the generation of aluminum-fluoride complex ions, or it may be light-colored, or slightly cloudy, depending on the degree of reaction and the state of impurities.

This reaction is of great significance in industry. For example, in the aluminum smelting industry, fluoride is often used as a melting agent. Its response to aluminum electrodes is related to the efficiency and quality of aluminum smelting. And in the field of battery research and development, the concept of aluminum-fluoride batteries is also based on this principle of reaction. However, in order to make this concept a reality, many problems need to be solved, such as the control of reaction rate and the extension of electrode life.

All of these show that the reaction between aluminum electrodes and fluoride is a key issue in chemical research and industrial applications, which needs to be explored by scholars.