Kolokorroosio

Kolokorroosio, also known as pitting corrosion, is a localized form of corrosion that leads to the formation of small holes or cavities in a metal surface. This type of corrosion is particularly insidious because it can cause significant structural damage with relatively little overall loss of material, making it difficult to detect in its early stages.

The mechanism of kolokorroosio typically involves the breakdown of a passive film that protects the metal. Once a small defect or break occurs in this protective layer, a localized electrochemical cell is established. The area within the pit becomes anodic, while the surrounding metal acts as the cathodic region. This imbalance leads to a rapid dissolution of the metal within the pit. Factors that promote kolokorroosio include the presence of aggressive ions, such as chlorides, in the corrosive environment, as well as variations in surface conditions or inclusions within the metal itself.

Metals like stainless steels, aluminum alloys, and nickel alloys are susceptible to kolokorroosio, especially in environments containing chloride ions, such as seawater or industrial brines. The consequences of kolokorroosio can range from aesthetic degradation to catastrophic failure of components due to deep penetration of the pits. Prevention and mitigation strategies often involve controlling the chemical composition of the environment, selecting corrosion-resistant materials, and ensuring proper surface treatments.