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, forming metal sulfides (MeS) and atomic hydrogen (H^o) as corrosion byproducts. Atomic hydrogen either combines to form H₂ at the metal surface or diffuses into the metal matrix. Since sulfur is a hydrogen recombination poison, the amount of atomic hydrogen which recombines to form H₂ on the surface is greatly reduced, thereby increasing the amount of diffusion of atomic hydrogen into the metal matrix.

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