Observation of Chloride SCC Process of Type 304 Stainless Steel by Acoustic Emission and Corrosion Potential Fluctuation Analyses

DOI
  • YONEZU Akio
    Faculty of Science and Engineering, Aoyama Gakuin University
  • CHO Hideo
    Faculty of Science and Engineering, Aoyama Gakuin University
  • IKEDA Ryuji
    Research and Development, Asahi-Diamond Corporation
  • OGAWA Takeshi
    Faculty of Science and Engineering, Aoyama Gakuin University
  • TAKEMOTO Mikio
    Faculty of Science and Engineering, Aoyama Gakuin University

Bibliographic Information

Other Title
  • ＡＥと腐食電位揺動解析によるＳＵＳ３０４鋼の塩化物応力腐食割れプロセスの観察

Description

This paper discusses the process of chloride SCC of sensitized and non-sensitized Type-304 stainless steel based on the simultaneous monitoring of AE and corrosion potential fluctuation (CPF). The steel produced transgranular SCC via corrosion pits filled by corrosion product (chromium oxy-hydroxides) in 35 mass % MgCl2 solution. Neither the pitting corrosion nor transgranular SCC produced primary AEs due to anodic dissolution process, while they did generate rapid drop (RD) type CPF. However, we detected secondary AEs from hydrogen gas evolution and fracture of corrosion products. Hydrogen gas was found to produce AE with a limited frequency component, while the fracture of corrosion products produced the AE with broad frequency component. The sensitized steel produced primary AEs due to the falling-off of grains as well as secondary AEs from hydrogen gas evolution and the fracture of corrosion products. Microscopic progression of SCC was consistently interpreted by the timing and time-lag of AEs and CPFs.

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Details 詳細情報について

  • CRID
    1390282681471403904
  • NII Article ID
    130004458079
  • DOI
    10.11396/jjsndi.56.34
  • ISSN
    03675866
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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