What happens to corrosion resistance when surface finish is degraded?

When the surface finish of a metal structure is degraded, the corrosion resistance worsens. This is due to the fact that a proper surface finish typically protects the underlying metal from environmental factors such as moisture, salt, and atmospheric pollutants that can lead to corrosion.

A smooth, well-maintained surface finish helps to minimize the surface area exposed to corrosive elements and can also include protective coatings that further enhance the metal's resistance to corrosion. When this finish is compromised—whether through scratches, wear, or chemical attack—these protective barriers are reduced or entirely removed, allowing corrosive agents to reach the metal more easily.

As a result, the likelihood of corrosion occurring increases, leading to potential structural damage and reduction in the lifespan of the metal components. Hence, degradation of the surface finish directly correlates with a decrease in corrosion resistance.