Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Electrophoretic Deposition of Ni Nano-particles for Self-repairing of Heat Exchanger Tubes

  • Lee, Gyoung-Ja (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology) ;
  • Pyun, Su-Il (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology) ;
  • Rhee, Chang-Kyu (Nuclear Nano-Materials Development Lab., Korea Atomic Energy Research Institute)
  • Published : 2006.09.24
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Abstract

The electrophoretic deposition process of Ni nano-particles was employed for self-repairing of heat exchanger tubes. For electrophoretic deposition of Ni nano-particles on pitted Ni alloy specimen, a constant electric field of 100 V $cm^{-1}$ was applied to the specimen for 180 s in Ni-dispersed solution. It was found that as electrophoretic deposition proceeded, the size of the pit remarkably decreased due to the agglomeration of Ni nano-particles at the pit. This strongly suggests that the electrophoretic mobility of the charged particles is larger for the pit with a higher current value rather than outer surfaces with a lower current value.

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