How can one identify the onset of pitting corrosion?

Identifying the onset of pitting corrosion is crucial for assessing the integrity of metal structures. One of the most common signs of this type of corrosion is the presence of gray or white powdery deposits. These deposits are often a result of localized corrosion activity where the metal undergoes electrochemical reactions, leading to the formation of pits. The powdery deposits typically consist of corrosion products that form as the metal begins to degrade, making it a reliable visual indicator of pitting corrosion.

While other signs and methods might be associated with general corrosion or other forms of metal degradation, the appearance of these specific deposits directly correlates with the initiation of pitting corrosion. Recognizing this early can prompt preventive measures or repairs before more severe damage occurs.