Abstract
The anodic polarization method was verified to be suitable for evaluating the degree of sensitization for the weldment of stainless steel at the passive region. Heat treated weldment and parent are more sensitized than untreated weldments and parents. Specifically, weldments treated at 730°C with a 4 h holding time and then cooled in a furnace are the most sensitized. An unstable passive film formed on the surface of the heated-treated weldment because of the Cr-depletion zone at the passive region. The time to failure (TTF) for the parent in synthetic seawater requires a longer amount of time than that in air. However, the TTF for the weldment is shorter than that in air. The heat treated-weldment in a corrosive environment was the most severely damaged among the specimens. For the heat-treated weldment, most acoustic emission (AE) counts were emitted until 4 × 105 s, whereas those for the untreated weldment were produced over the elastic-plastic deformation range. Moreover, the number of AE counts per hour for the heat-treated weldments and parents decreased considerably compared with the untreated weldments and parents.
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