SUS304 鋼単結晶のMgCl_2 溶液中における応力腐食割れとその電位依存性

概要

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The susceptibility to stress corrosion cracking (SSC) and its potential dependence were examined for SUS 304 steel single crystal with the single slip orientation, I.e., 0.50 in Schmid factor. The SCC tests were carried out in boiling 25〜45% MgCl_2 solutions under various constant potential in the present study. The corrosion morphology of the specimen surface SCC-tested was dependent on both MgCl_2 concentration and applied potential: The potential range for SCC occurrence of which critical potential was -380〜-400 mV (SCE) increased with increasing MgCl_2 concentration. In this case, the threshold concentration for cracking was about 30%,below which the potential range for pitting appeared. The uneven general corrosion occured as the potential was shifted to more noble values. On the other hand, the cracks mentioned above initiated from the specimen surface which was easy to induce slip-steps by plastic deformation. The fracture surface characterized by river-like pattern was found by the crack growth along <110> direction on {110} plane.
社団法人日本材料学会の論文
1986-09-15