高耐食スタンダード二相ステンレス鋼の腐食挙動とTa添加量の検討 －介在物改質による高耐食二相ステンレス鋼の開発（2）－

西澤 夏来; 長尾 護; 河盛 誠; 米永 洋介; 衣笠 潤一郎; 佐藤 俊樹

doi:10.3323/jcorr.64.324

Research Paper–A Rapid Communication Note of the 61th Japan Conference on Materials Environments–

Effect of Amount of Tantalum on Corrosion Behavior of High Corrosion Resistant Standard Duplex Stainless Steels

－Development of High Corrosion Resistant Duplex Stainless Steels by Inclusion Control (2)－

Natsuki Nishizawa, Mamoru Nagao, Makoto Kawamori, Yosuke Yonenaga, Junichiro Kinugasa, Toshiki Sato

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Keywords: duplex stainless steel, pitting corrosion, pitting potential, inclusion control, manganese sulfide, tantalum

JOURNAL FREE ACCESS

2015 Volume 64 Issue 7 Pages 324-327

DOI https://doi.org/10.3323/jcorr.64.324

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Abstract

Duplex stainless steel has high corrosion resistance and high strength. However, pitting corrosion occurs in duplex stainless steel in the solution containing high concentrated chloride ion. Pitting corrosion is caused by dissolution of inclusion, such as manganese sulfide (MnS). In previous study, the pitting corrosion resistance of the super duplex stainless steels including 20 ppmS could improve by Ta addition in the steels. In this study, we investigated the effect of addition of Ta on pitting corrosion behavior in standard duplex stainless steels including 10 ppm S. In conclusion, we observed that pitting corrosion resistance of standard duplex stainless steels could improve by addition over 0.06 mass% addition of Ta.

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