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Corrosion behavior of aluminum alloy in simulated nuclear accident environments regarding the chemical effects in GSI-191

  • Da Wang (Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University) ;
  • Amanda Leong (Nuclear Material and Fuel Cycle Center, Department of Mechanical Engineering, Virginia Polytechnic Institute and State University) ;
  • Qiufeng Yang (Nuclear Material and Fuel Cycle Center, Department of Mechanical Engineering, Virginia Polytechnic Institute and State University) ;
  • Jinsuo Zhang (Nuclear Material and Fuel Cycle Center, Department of Mechanical Engineering, Virginia Polytechnic Institute and State University)
  • 투고 : 2021.09.02
  • 심사 : 2022.06.29
  • 발행 : 2022.11.25

초록

Long-term aluminum (Al) corrosion tests were designed to investigate the condition that would generate severe Al corrosion and precipitation. Buffer agents of sodium tetraborate (NaTB), trisodium phosphate (TSP) and sodium hydroxide (NaOH) were adopted. The insulation materials, fiberglass and calcium silicate (Ca-sil), were examined to explore their effects on Al corrosion. The results show that significant precipitates were formed in both NaTB/TSP-buffered solutions at high pH. The precipitates formed in NaTB solution raise more concerns on chemical effects in GSI-191. A passivation layer formed on the surfaces of coupon in solution with the presence of insulations could effectively mitigate Al corrosion. The Fe-enriched intermetallic particles (IPs) embedded in coupon appeared to serve as seeds to readily induce precipitation via providing extra area for heterogeneous Al hydroxide precipitation. X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analyses indicate that the precipitates are mainly boehmite (γ-AlOOH) and no direct evidence confirms the presence of sodium aluminum silicate or calcium phosphate.

키워드

과제정보

The first author (Da Wang) would like to acknowledge the NCEPU Scholarship Fund and Dr. Fenglei Niu who is the doctoral supervisor of Da Wang at NCEPU for his care and encouragement. All the research was conducted at Virginia Tech and was supported by the corresponding author's (Jinsuo Zhang) Startup funds.

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