60℃の30%HNO_3水溶液において不働態化処理を施したSUS304ステンレス鋼の水素ぜい化挙動

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This study was intended to develop the alleviation countermeasures against hydrogen embrittlement of an austenitic stainless steel (SUS304). As the first step, the passivation treatment which is recommended to be used for prevention of crevice corrosion in "Method of pitting potential measurement for stainless steel" in JIS was adopted. Slow strain rate tension tests were carried out for the passivation treated specimens under the environment of hydrogen evolution immediately after the specimens were held for various time periods at hydrogen evolution potentials on the cathodic polarization curve which was obtained in 3%NaCl solution. The main results obtained are as follows. (1) The pitting initiation potential of the passivation treated specimen showed a more noble potential of 0.087 V (vs.S.C.E.) than the untreated specimen. The passivity maintaining current also showed a stable atate. Therefore, the passive state film which was formed on the specimen is considered stable. (2) The passivation treated specimen immersed for 90 minutes in 30%HNO_3 solution at 60℃ showed a larger change of mechanical properties, i.e., reduction in area and time to fracture, than the untreated specimen at cathodically charged potential under each setting condition. From the SEM observation of fracture surfaces, the fraction of brittle region in the treated specimen, characterized by transgranular fracture including quasi-cleavage fracture, decreased from that of the untreated specimen. The effect of passive state film was well recognized, and the hydrogen embrittlement behavior appeared alleviated.
社団法人日本材料学会の論文
1994-11-15

60℃の30%HNO_3水溶液において不働態化処理を施したSUS304ステンレス鋼の水素ぜい化挙動

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