Abstract
SCC susceptibility of Type 304 stainless steel depends on NaCl concentration in aqueous solution composed of H2SO4 and NaCl. Immersion potential and electrode impedance were measured during SSRT(Slow Strain Rate Tensile) test in two kinds of solutions; i.e., one is 2.5 kmol•m-3 H2SO4+0.2 kmol•m-3 NaCl solution in which SCC occurs and the other is 2.5 kmol•m-3 H2SO4+3.0 kmol•m-3 NaCl solution in which SCC does not occur. In case of non-SCC, the enhancement of cathodic reaction was observed during the measurement of corrosion potential in both solutions, while in case of SCC, the enhancement of anodic reaction was observed. In addition, Rct, Cdl and τ0 slightly depend on the stress loaded on specimens in case of non-SCC, but they greatly depend on the stress loaded on specimens in case of SCC.
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