The meaning and surface of the passivation treatment of aluminum alloy sheet/aluminum alloy rod
In general, metals that are easily ionized are easily oxidized, that is, they are easily corroded, but in fact not completely. Some metals such as aluminum, magnesium, and chromium are ea..........
In general, metals that are easily ionized are easily oxidized, that is, they are easily corroded, but in fact not completely. Some metals such as aluminum, magnesium, and chromium are easily ionized, but they are prone to corrosion in the atmosphere or in others. The film of the product, which improves corrosion resistance. By chemical or telephone method, the state of the metal surface changes, causing the dissolution rate to drop sharply and improve the corrosion resistance. This process is called passivation. Passivation is often accompanied by a sudden rise in the anode point, making the anode plate reaction difficult to cope with, slowing or stopping the metal corrosion rate. Since aluminum alloy sheet/aluminum alloy bar passivation can significantly improve the corrosion resistance of metals, it is widely used in machinery, electronics, instruments, daily necessities, military equipment and other fields.
There are many theories about the passivation mechanism of aluminum alloy sheet/aluminum alloy rod, mainly from two kinds, one is thin film theory, and the other is adsorption theory. Thin film theory believes that during the passivation process, an oxide film is formed on the metal surface. It is precisely because of this layer of friction that the base metal is separated from the corrosive medium to protect the body metal from further corrosion. According to the adsorption theory, in the process of passivation of aluminum alloy sheet/aluminum alloy rod, a metal layer forms an adsorption layer, which is mainly an adsorption layer. It is because of the presence of this layer of adsorption that the corrosion of the metal is improved. However, in the above two theories, the complete passivation phenomenon cannot be completely explained and needs further improvement.
Article source: www.bombgroup17.com; 7075 aluminum alloy aluminum alloy sheet, aluminum alloy rod