1. Sulfurization

Sulfidation can be divided into two main categories: corrosion in an oxidizing medium in an environment containing SO ₂ and corrosion in a reducing medium. As the resistance of the main alloys is often linked to chromine protection, corrosion in reducing media can itself be split into two categories depending on whether chromine is thermodynamically unstable (H ₂ / H ₂ S, sulfur vapor) or stable [mixed gas environments (H ₂ , CO, CO ₂ , H ₂ O, H ₂ S, COS)].

Although the sulfidation and oxidation mechanisms are fundamentally similar (cf. article...