低濃度転化マグネシウム溶液中のSUS304鋼の応力腐食割れ発生

概要

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In order to examine SCC of SUS 304 in industrial usage, the double bend-beam tests (four point bending) were carried out in low concentrated MgCl_2 solutions under O_2 flow, and the relation between SCC and crevice corrosion was examined. The results obtained are summarized as follow: In the double bend-beam test, cracks appeared on both of the sensitized SUS 304 and the solution-treated one under low MgCl_2 concentration and low temperature conditions. The concentration and temperature in these experiments were low enough to be comparable to the SCC initiation condition Corrosion took place within the crevice between the double bend-beams. The initiation points of SCC were concentrated near the boundary between the crevice corrosion area and the non-corrosion area, where the passive state film seems to be very unstable. The crevice corrosion is considered to induce SCC initiation by concentration of chlorides and destabilization of passive state film in the crevice.
社団法人日本材料学会の論文
1986-04-15