What are the two main types of corrosion?

The correct identification of the two main types of corrosion is based on their behavior and impact on materials. General corrosion refers to a uniform loss of material across a surface, typically observed in environments where metals are exposed to corrosive elements, leading to a gradual deterioration. In contrast, localized corrosion occurs in specific areas and can manifest as pitting, crevice corrosion, or galvanic corrosion. This type of corrosion is often more severe and can lead to failure even when the overall loss of material appears minimal.

Understanding these categories is critical for coatings inspectors, as the type of corrosion can dictate the necessary protective measures and inspection techniques. By distinguishing between general and localized corrosion, inspectors can better assess the risk and implement suitable remediation strategies that protect infrastructure and prolong the lifespan of materials under service conditions.