Passivation layer

A passivation layer is a thin layer that is formed on the surface of a metal to protect it from corrosion. This layer is formed by chemical reactions between the metal and its environment, particularly with oxygen, water or other corrosive substances.

A passivation layer is typically formed by oxidation of the metal, creating a protective layer of metal oxides. This layer forms a barrier between the metallic substrate and the corrosive elements that tend to destroy the metal. The passivation layer acts as a protective shield by preventing direct contact between the metal and the corrosive substances. This slows down the corrosion process considerably and extends the service life of the metal.

Depending on the specific requirements of the application, different materials can be used to form a passivation layer. Commonly used materials are chromates, phosphates, molybdates or silicates, which offer specific properties and are suitable for certain applications. The passivation layer can be applied by various methods, including chemical treatments, coating processes or electrochemical methods. The choice of process depends on factors such as the metal to be passivated, the environmental conditions and the desired properties of the passivation layer.

Overall, the passivation layer is an important technique in the field of corrosion protection, which helps to extend the service life of metallic components and structures and improve their performance under demanding environmental conditions.