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EROSION-CORROSION BEHAVIOR OF HIGH NITROGEN STAINLESS STEEL AND COMMERICAL 321 STAINLESS STEEL |
QIAO Yanxin1,2, LIU Feihua1, REN Ai1, JIANG Shengli2, ZHENG Yugui2 |
1. Suzhou Nuclear Power Research Institute, Suzhou 215004
2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Abstract The erosion-corrosion behavior of high nitrogen stainless steel and commercial 321 stainless steel in slurry flow was investigated by using a high-speed jet impingement erosion-corrosion apparatus. Meanwhile, the mass loss caused by erosion and corrosion and synergistic of corrosion and erosion was calculated. Compared to commercial 321 stainless steel, high nitrogen stainless steel has relatively superior corrosion resistance both in static NaCl solution and slurry flow. Erosion not only accelerated the traction of oxygen but also damaged the passive film formed on stainless steel. The damage of the passive film resulted in an active dissolution state and induced the corrosion current density increasing 100 times more than that in static solution. The mass loss caused by pure erosion was the dominant factor in total mass loss.
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Received: 30 November 2010
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Corresponding Authors:
Qiao Yanxin
E-mail: qiaoyanxin@cgnpc.com.cn
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