Abstract
Fracture mechanics techniques were employed to study stress corrosion cracking (SCC) of AISI C‐1018 mild steel in hot (92°C) solutions of and . Tests were conducted under potentiostatic conditions at the most susceptible SCC potentials near the active‐passive transition, using fatigue precracked double cantilever beam specimens. The solution pH within the crack was measured and the fractography was studied by scanning electron microscopy. Crack rates are related to the stress intensity and are lower in the sulfide solution at comparative levels. The mechanism of cracking is consistent with an anodic dissolution process involving rupture of passive films at the crack tip. The lower crack rates in the sulfide solution are discussed in terms of faster repassivation kinetics and the effect of S2− on iron dissolution rates.
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