Potentiostatic Study on Anodic Behaviour of Iron-Chromium Alloys (Electrochemical Properties of Stainless Steels (I))

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  • Shiobara Kunio
    Department of Metallurgy, Faculty of Engineering, Tôhoku University
  • Sawada Yoshinobu
    Department of Metallurgy, Faculty of Engineering, Tôhoku University
  • Morioka Susumu
    Department of Metallurgy, Faculty of Engineering, Tôhoku University

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  • Fe-Cr合金の陽極的挙動の定電位法による研究
  • Fe-Cr ゴウキン ノ ヨウキョクテキ キョドウ ノ テイデンイホウ ニ ヨル ケンキュウ

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Abstract

The anodic behaviour of seventeen annealed iron-chromium alloys ranging in composition from 0 to 100%Cr in deaerated sulphuric acid solution at 25°C was investigated systematically. The semi-conductor type potentiostat was used for polarization messurement. A number of properies such as spontaneous or corrosion potential, passivation potential, Flade potential, initial and secondary maximum corrosion currents (passivation current), passive current, trans-passive current were compared with the change in composition of alloys. It has been found that the alloys with more than 22%Cr give a negative loop in anodic polarization curve at potential range between −0.4 volt and 0 volt (vs S.C.E), indicating that these alloys, at these potential range, become spontaneously passive by hydrogen iron.

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