Abstract
The influences of the common impurities P, S, Sn, Cu and Ni on the intergranular stress corrosion cracking (IGSCC) of a typical mild steel (0.15% C, 0.8% Mn and 0.05% Si) were studied in solutions of NH4NO3 and a mixture of Na2CO3 and NaHCO3. Slow strain rate measurements showed that carbon dominated the IGSCC susceptibility. Despite the presence of the impurities at grain boundaries it was shown that only P has any significant effect and this only outside the most critical potential regime. Mechanisms for the influences of carbon and impurities are considered. The deterioration in the passivation rate caused by the disruptive presence of these elements in the oxide films is the suggested cause of IGSCC susceptibility.
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