Propagation Analysis of Crevice Corrosion on SUS304 Stainless Steel Under Potentiostatic Condition in Artificial Sea Water

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  • Matsuhashi Ryo
    Steel Research Laboratories, Nippon Steel & Sumitomo Metal Corporation
  • Matsuoka Kazumi
    Steel Research Laboratories, Nippon Steel & Sumitomo Metal Corporation
  • Nose Kiyomi
    Material Performance Solution Center, Nippon Steel & Sumikin Technology
  • Kajimura Haruhiko
    Reseach & Development Center, Nippon Steel & Sumikin Stainless Steel Corporation

Bibliographic Information

Other Title
  • 定電位法によるSUS304の人工海水中におけるすきま腐食進展挙動解析
  • 定電位法によるSUS304の人口海水中におけるすきま腐食進展挙動解析
  • テイデンイホウ ニ ヨル SUS304 ノ ジンコウ カイスイチュウ ニ オケル スキマフショク シンテン キョドウ カイセキ

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Abstract

The propagation behavior of crevice corrosion on SUS304 was investigated by the new crevice corrosion test apparatus. The corrosion area and corrosion current in glass/metal crevice can be measured at the same time by this apparatus. The specimen was polished just before the crevice corrosion test under the constant potential condition, E=299 mV, 399 mV and 499 mV (SHE), in artificial seawater at room temperature. Some important results were obtained. The crevice corrosion initiation time tVI determined by the visual observation was coincident with tINCU determined by the current density change. The crevice corrosion area, ACREV, increased exponentially with time from the crevice corrosion initiation time. However, the increasing rate of the crevice corrosion volume, VCREV, changed at the time, tR, which crevice corrosion reached at the edge of crevice. We divided the corrosion process into two stages, Region I and Region II. Region I and Region II are defined as the time region before and after tR respectively. The increasing rate of VCREV in Region II was larger than that in Region I. However, the increasing rate of ACREV in Region I was slightly larger than that in Region II.

Journal

  • Zairyo-to-Kankyo

    Zairyo-to-Kankyo 64 (2), 51-59, 2015

    Japan Society of Corrosion Engineering

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