What is pitting corrosion?

Pitting corrosion is a localized form of corrosion characterized by the formation of small, discrete pits or cavities on the surface of the metal. This type of corrosion occurs more rapidly than uniform corrosion, and it can lead to significant structural damage despite the overall metal surface appearing relatively unaffected. Pitting typically arises in environments where specific conditions, such as stagnant water or access to chlorides, are present, making it especially concerning in marine environments.

The nature of pitting corrosion makes it particularly insidious; it can lead to failures due to the depth of the pits, which may go unnoticed during routine inspections. The localized nature means that while the general area might show little sign of corrosion, the metal's integrity could be severely compromised in the pitted areas. Understanding this specific type of corrosion is crucial for maintenance and prevention strategies in marine applications.