What is a key indicator of Stage 4 corrosion?

A key indicator of Stage 4 corrosion is pitting and significant erosion of metal. At this stage, the corrosion has progressed to a point where it is no longer just a surface issue but has penetrated deeper into the material. Pitting indicates localized areas of corrosion, leading to small, crater-like holes in the metal, which can compromise structural integrity. Significant erosion reflects the loss of material due to ongoing corrosion processes, making the metal weaker and potentially leading to failure if not addressed.

Understanding the stages of corrosion is crucial for assessing the condition of intermodal containers, as different stages signify different levels of damage and require varying approaches to remediation. Therefore, recognizing pitting and significant erosion as indicators of advanced corrosion is essential for effective maintenance and safety management in intermodal transportation.