How does pitting first manifest on a structure?

Pitting often begins with the formation of small, localized areas of corrosion on a metal surface, which can appear as a gray or white powdery substance. This initial manifestation happens due to the electrochemical reactions that occur at specific points on the metal, leading to the breakdown of the protective oxide layer. Over time, as the corrosion progresses, it creates small pits or holes that may eventually penetrate deeper into the metal if left untreated.

Understanding this process is crucial for maintenance and integrity assessments of structures at risk of corrosion. By identifying the early signs of pitting, such as the appearance of powdery deposits, measures can be taken to mitigate further damage before it leads to more significant structural issues like deep cracks or perforation.