Corrosion behavior of a Co−Cr−Mo−Si alloy in pure Al and Al−Si melt

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  • Kenta Yamanaka
    Institute for Materials Research, Tohoku University , 2-1-1 Katahira , Aoba-ku , Sendai 980-8577 , Japan
  • Manami Mori
    Institute for Materials Research, Tohoku University , 2-1-1 Katahira , Aoba-ku , Sendai 980-8577 , Japan
  • Kazuo Yoshida
    Institute for Materials Research, Tohoku University , 2-1-1 Katahira , Aoba-ku , Sendai 980-8577 , Japan
  • Phacharaphon Tunthawiroon
    Department of Industrial Engineering, School of Engineering, King Mongkut’s Institute of Technology Ladkrabang , Bangkok , 10520 , Thailand
  • Akihiko Chiba
    Institute for Materials Research, Tohoku University , 2-1-1 Katahira , Aoba-ku , Sendai 980-8577 , Japan

説明

<jats:title>Abstract</jats:title> <jats:p>Metallic phase change materials (MPCMs) are attracting considerable attention for their application in thermal energy storage. Al–Si alloys are considered potential MPCMs; however, to develop storage systems/modules, it is crucial to fabricate corrosion-resistant materials for MPCMs. In this study, the corrosion behavior of Co−28Cr−6Mo−1.5Si (wt%) alloy was examined via immersion tests in commercial Al−Si alloy (ADC12) melt at 700°C for 10 h. The results were compared to those obtained for pure Al. Substrate thickness loss measurements revealed that the liquid metal corrosion was more severe in the Al−Si melt than that in pure Al, suggesting an increased reactivity due to Si addition. Interfacial analysis elucidated a direct reaction between the alloy substrate and molten Al in both cases. Furthermore, the formation of oxides such as Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and SiO<jats:sub>2</jats:sub> did not contribute to corrosion resistance.</jats:p>

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