CERT法による316オーステナイトステンレス鋼の応力腐食割れに関する金属電気化学的研究

概要

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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×l0^<-5>m/s to 1.6×10^<-7>m/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 (0.39 V vs. NHE), but immune to SCC at both the steady passive potential (-0.06 V vs. NHE) and the unsteady one (0.19 V 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^<-6>m/s, and this phenomenon was ascribable to the SCC caused from the pitting corrosion.
社団法人日本材料学会の論文
1982-06-15