Oxidation

Oxidation is a process that plays an important role in surface technology and is often deliberately used or controlled to change or improve the properties of material surfaces. During oxidation, a material reacts with oxygen or other oxidizing agents and forms an oxide layer on its surface.

In many cases, oxidation is considered undesirable as it is often associated with corrosion and material wear. Metals tend to form an oxide layer when in contact with oxygen, which can affect their mechanical properties and appearance. To prevent this, various protective coatings and surface treatments are used in surface technology to prevent or slow down the formation of oxide layers.

On the other hand, oxidation can also be used specifically to protect certain materials or improve their properties. For example, anodizing aluminium creates a controlled oxidation layer that improves the metal's corrosion resistance, hardness and color. Similarly, the formation of a passivation layer on stainless steel through oxidation can increase its corrosion resistance.

In addition, oxidation can also be used for decorative purposes, such as in the formation of natural patinas on copper or bronze, which create an aesthetically pleasing appearance.

Overall, oxidation is a versatile process in surface engineering that offers both challenges and opportunities. By understanding the underlying mechanisms, engineers and scientists can harness oxidation to improve the performance and aesthetics of material surfaces.