Abstract
The SCC susceptibility of Type 316 stainless steel in 3% NaCl solution was studied by the potentiostatic CERT method in relation to the polarization behavior of the specimen. The effect of the crosshead speed on the tensile strength and the reduction of the sectional area was inspected with the crosshead speed over the range of 1.67×10-5m/s to 1.6×10-7m/s, and the fracture surface was observed by a scanning electron microscope.In 3% NaCl solution, Type 316 stainless steel was very susceptible to SCC at the pitting potential (0.39V vs. NHE), but immune to SCC at both the steady passive potential (-0.06V vs. NHE) and the unsteady one (0.19V vs. NHE).The mechanical properties such as the tensile strength and the reduction of sectional area of the specimen at the pitting potential decreased remarkably at the crosshead speeds below 1.67×10-6m/s, and this phenomenon was ascribable to the SCC caused from the pitting corrosion.
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