The effect of applied potential on the Intergranular stress corrosion cracking (IGSCC) of sensitized Type 304 stainless steel has been studied in deaerated dilute Na2SO4 solution at 285 C using constant deflection (single and double U-bend specimens) and constant load (as polished and preoxidized specimens) techniques. The surface appearance after SCC tests was examined with the SEM. The potential region for IGSCC was remarkably dependent upon the stressing method and surface conditions. The role of dissolved oxygen in the IGSCC is discussed in relation to these results and a hypothesis on the mechanism of IGSCC is proposed.

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National Association of Corrosion Engineers
1982
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