Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Stress Corrosion Cracking of Alloy 600 in an Aqueous Solution Containing Lead Oxide

  • Kim, Dong-Jin (Nuclear Materials Research Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Hong-Pyo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Hwang, Seong-Sik (Nuclear Materials Research Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Joung-Soo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Park, Jang-Yul (Nuclear Materials Research Division, Korea Atomic Energy Research Institute (KAERI))
  • Received : 2008.11.20
  • Accepted : 2009.06.26
  • Published : 2010.04.01
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Abstract

The stress corrosion cracking (SCC) behavior of Alloy 600 was studied in aqueous solutions containing lead. Electrochemical polarization and current transient experiments were performed at $315^{\circ}C$ in a 40% sodium hydroxide solution to assess the effect of lead on a passive film formed on Alloy 600. The influences of the alloy microstructure and the addition of an inhibitor to the environments on lead-induced SCC were investigated using C-ring and slow strain-rate tensile (SSRT) tests in demineralized high-purity water and caustic solutions containing PbO at $315^{\circ}C$. The surface films on Alloy 600 were examined using Auger electron spectroscopy (AES) and energy dispersive x-ray spectroscopy (EDXS). The PbO markedly accelerated SCC of Alloy 600 in the caustic solution and the high-purity water at $315^{\circ}C$. The addition of nickel boride (NiB) or cerium boride ($CeB_6$) to the test solutions decreased the susceptibility of Alloy 600 to SCC. Thermally treated Alloy 600 (Alloy 600 TT) tended to crack in a transgranular mode, while the solution-annealed Alloy 600 (Alloy 600 SA) tended to crack in an intergranular mode in water containing PbO.

Keywords

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