Direct Observation of Pit Initiation Process on Type 304 Stainless Steel

• Chiba Aya

  Department of Materials Science, Tohoku University

• Muto Izumi

  Department of Materials Science, Tohoku University

• Sugawara Yu

  Department of Materials Science, Tohoku University

• Hara Nobuyoshi

  Department of Materials Science, Tohoku University

抄録

In situ and real-time optical microscopic observations of pit initiation process on a commercial Type 304 stainless steel with low-sulfur content (0.004 mass%) were performed in 3 M NaCl solution at 298 K. MnS inclusions with diameters of ca. 1 µm were found to act as the initiation sites of pitting, as was the case in a re-sulfurized Type 304 stainless steel (0.027 mass%). The pit was initiated at the boundary between the MnS inclusion and the steel matrix, and grew with time. After a few seconds, no visible change was observed for 1 s, even though the anodic current was measured, suggesting that the steel dissolution proceeded in the depth direction. After that, a small hole suddenly appeared on the steel surface. The hole widened with time, steadily becoming a large stable pit. This pit initiation process in the low-sulfur stainless steel is much like that found in the re-sulfurized stainless steel.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 55 (5), 857-860, 2014

  公益社団法人 日本金属学会

キーワード

• type 304 stainless steel
• manganese sulfide inclusion
• pit
• initiation site of pitting
• <i>in situ</i> observation
• microelectrochemical technique

詳細情報

• CRID: 1390001204252201856
• NII論文ID: 40020051306
• NII論文ID: 130004455301
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.m2014028
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 025428236
• Web Site: http://id.ndl.go.jp/bib/025428236
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I025428236
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/55/5/55_M2014028/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可