Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
Volume 68 , Issue 12
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Conference Publication
Research Paper
  • Azusa Ooi, Yaoki Ise, Eiji Tada, Atsushi Nishikata
    2019 Volume 68 Issue 12 Pages 347-354
    Published: December 10, 2019
    Released: June 02, 2020

    A system that can stop pit growth automatically at any time after the pit initiation under a chloride solution droplet was developed. Using this system, atmospheric pitting corrosion of austenitic stainless steels with various sulfur (S) concentrations was investigated. It was confirmed that initiation site of pitting corrosion was manganese sulfide (MnS) inclusions under the droplets regardless of S concentrations. In addition, the growth behavior of the active dissolution area doesn't also depend on S concentrations. When these specimens were subjected to wet-dry cycle tests, probability of pitting corrosion increases with S concentrations due to increasing initiation site, and there is no clear difference in chloride concentrations for onset of the pitting corrosion. On the other hand, repassivation behavior is strongly depends on S concentrations.

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