High temperature sulfur corrosion tends to appear as what type of damage?

• A. Pitting
• B. Uniform wall loss
• C. Localized thinning
• D. Cracking

Answer: (B)

High temperature sulfur corrosion is characterized by uniform wall loss, which occurs due to the chemical reaction between sulfur compounds and the metal, leading to an even and gradual thinning of the material across its surface. This type of corrosion typically affects the entire exposed surface area uniformly, as it is driven by the presence of corrosive sulfur compounds at elevated temperatures.

In this context, the process involves the formation of corrosion product layers that can promote further corrosion across large areas, rather than forming isolated pits or localized damage. The uniform nature of the wall loss associated with high temperature sulfur corrosion makes it distinct from other forms of corrosion, which may manifest as isolated patches, craters, or cracks. Understanding this helps in developing effective maintenance and monitoring strategies for pressure vessels operating in high sulfur environments.