Passivoituja

Passivoituja is a Finnish term that translates to "passivated" in English. It is commonly used in materials science and engineering to describe a process that makes a material less reactive or susceptible to corrosion. This is typically achieved by forming a protective layer on the surface of the material.

For metals, passivation often involves exposing the surface to an oxidizing agent, such as nitric acid. This treatment encourages the formation of a thin, adherent, and often transparent oxide film. This film acts as a barrier, preventing the underlying metal from further oxidation or reaction with its environment. Stainless steel is a well-known example where passivation is crucial for its corrosion resistance. The chromium content in stainless steel naturally forms a passive oxide layer, but deliberate passivation treatments can enhance this protective layer.

The concept of passivation is not limited to metals. It can also apply to other materials and contexts. For instance, in semiconductor manufacturing, passivation layers are used to protect sensitive electronic components from contamination and electrical leakage. In biological contexts, a cell or organism can be described as passivated if it has become less responsive to stimuli or has entered a dormant state. The specific method and effect of passivation vary greatly depending on the material and the intended application.