“Oxidation is the reaction of metal and oxygen to form oxides. It generally occurs in high temperature environments with excess oxygen.”
“Sulfidation is a high temperature corrosion mechanism that occurs due to interaction between sulfur-containing compounds and metal surfaces, forming metal sulfides. Like oxidation, sulfidation occurs in environments above 500 °F (260 °C).”
“Both oxidation and sulfidation can occur concurrently, particularly in mixed environments of oxygen and sulfur.”
(Reference: API RP 571, Sections 5.1.1 and 5.1.3 – Oxidation & Sulfidation)
These two mechanisms are thermally activated and occur in elevated temperature conditions found in heaters, furnaces, and piping systems. Hence, option B is correct.
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