Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of Aging Time on the Resistance to Localized Corrosion of the Hyper Duplex Stainless Steel

  • Jeon, Soon-Hyeok (Department of Material Science and Engineering, Yonsei University) ;
  • Kim, Soon-Tae (Department of Material Science and Engineering, Yonsei University) ;
  • Lee, In-Sung (Department of Material Science and Engineering, Yonsei University) ;
  • Kim, Ji-Soo (1Stainless Steel Research Group, POSCO Technical Research Laboratories) ;
  • Kim, Kwang-Tae (1Stainless Steel Research Group, POSCO Technical Research Laboratories) ;
  • Park, Yong-Soo (Department of Material Science and Engineering, Yonsei University)
  • Received : 2010.09.15
  • Accepted : 2010.10.21
  • Published : 2010.10.01
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Abstract

To elucidate the effect of aging time on resistance to localized corrosion of hyper duplex stainless steel, a double-loop electrochemical potentiokinetic reactivation test a potentiodynamic anodic polarization test, a scanning electron microscope-energy dispersive spectroscope analysis, and a thermodynamic calculation were conducted. With an increase in aging time, sigma phases are precipitated much more than chi phases due to the meta-stable chi phase acting as a transition phase. As aging time at $850^{\circ}C$ increases, the corrosion resistance decreases owing to an increase in Cr, Mo and W depleted areas adjacent to the intermetallic phases such as sigma phases and chi phases.

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References

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