Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
권호 표지
DOI QR코드

DOI QR Code

Study on the Immersion Corrosion Characteristics of Thermal Spray Coating for Sea Water Heat Exchanger

해수용 열교환기 적용을 위한 열분사 코팅의 침지부식특성 연구

  • Huh, Cheol (Offshore CCS Research Unit, Korea Research Institute of Ships & Ocean Engineering, Korea Institute of Ocean Science and Technology) ;
  • Cho, Meang-Ik (Offshore CCS Research Unit, Korea Research Institute of Ships & Ocean Engineering, Korea Institute of Ocean Science and Technology) ;
  • Kwon, Jeong-Tae (School of Mechanical Engineering, Hoseo University) ;
  • Kwon, Young-Chul (Department of Mechanical Engineering, Sunmoon University)
  • 허철 (한국해양과학기술원 선박해양플랜트연구소 해양CCS연구단) ;
  • 조맹익 (한국해양과학기술원 선박해양플랜트연구소 해양CCS연구단) ;
  • 권정태 (호서대학교 기계공학부) ;
  • 권영철 (선문대학교 기계공학과)
  • Received : 2013.11.25
  • Accepted : 2014.01.09
  • Published : 2014.01.31
Download PDF
⟨ Previous Next ⟩

Abstract

In the present study, immersion corrosion characteristics of Zn and Al thermal spray coating with sealer for the seawater heat exchanger are experimentally investigated. Total 8 coating types of Zn and Al thermal spray coating with silicone and epoxy sealer were tested with immersion corrosion testing in $80^{\circ}C$ 3.5%w NaCl solution and compared the corrosion characteristics between each coatings. To investigate the corrosion characteristics of the specimens, AC impedance, SEM, and thermal diffusivity were acquired and analyzed. As a result, on the surface of the specimens with silicone and epoxy sealer, blister did not occurred, so the sealers might be effective at increasing the corrosion resistance of the specimens immersed in the NaCl solution.

본 연구에서는 해수용 열교환기 적용을 위한 열분사 코팅의 침지부식 특성 및 열확산율을 조사하기 위해 실험이 수행되었다. 코팅은 아연과 알루미늄을 열분사 코팅한 뒤 실리콘 및 에폭시 수지를 추가 도포한 총 8개의 시편이며 이를 $70^{\circ}C$ 3.5%w NaCl 수용액에 2주간 침지하여 침지 전후의 부식특성 변화를 관찰하였다. 코팅의 부식특성 변화를 관찰하기 위하여 AC 임피던스 측정, SEM 촬영 등을 진행하였으며 레이저 확산법을 이용하여 침지 전후의 열확산율을 측정 및 비교하였다. 침지실험 결과로부터 실리콘 및 에폭시가 추가된 코팅 시편은 표면에 블리스터가 생성되지 않았으며 이에 실러 추가 코팅에 따른 내부식성 향상효과가 있는 것으로 확인되었다.

Keywords

References

  1. J. H. Kim, G. T. Kim, S. H. Park, W. Y. Oh, H. J. Kim, A Feasibility Study on Thermal Energy Resource in Deep Ocean Water, J. of the Korean Soc. for Marine. Env. Eng, Vol. 15, No. 1, pp. 9-18, 2012 https://doi.org/10.7846/JKOSMEE.2012.15.1.009
  2. G. Easter, Thermal Spraying - Plasma, Arc and Flame Spray Technology, Wexford College Press, 2008
  3. J. G. L. Barbera-Sosa, Y. Y. Santana, C. Villalobos-Gutierrez, S. Cabello-Sequera, Effect of Spray Distance on the Corrosion-Fatigue Behavior of a Medium-Carbon Steel Coated with a Colmonoy 88 Alloy Deposited by HVOF Thermal Spray, Surf. and Coat. Tech. Vol. 205, pp. 1137-1144, 2010 DOI: http://dx.doi.org/10.1016/j.surfcoat.2010.01.038
  4. R. Arrabal, A. Pardo, M. C. Merino, M. Mohedano, P. Casajus, S. Merino, Al/Sic Thermal Spray Coatings for Corrosion Protection of Mg-Al Alloys in Humid and Saline Environment, Surf. and Coat. Tech. Vol. 204, pp. 2767-2774, 2010 https://doi.org/10.1016/j.surfcoat.2010.02.030
  5. K. M. Moon, J. H. Shin, M. S. Oh, M. H. Lee, S. Y. Lee, Y. H. Kim, An Electrochemical Evaluation on the Corrosion Property of Metallizing Film, J. of the Korean Soc. of Marine Eng. Vol. 34, No. 5, pp. 670-677, 2010 DOI: http://dx.doi.org/10.5916/jkosme.2010.34.5.678
  6. J. H. Shin, K. M. Moon, An Electrochemical Evaluation on the Corrosion Property of Metallizing Film, Corr. Sci. and Tech. Vol. 9, No. 6, pp. 325-330, 2010
  7. M. I. Cho, C. Huh, Y. C. Kwon, J. T. Kwon, Experimental Study on Corrosion and Thermal Conductivity Characteristics of Thermal Spray Coating for Sea Water Heat Exchanger, J. of the Korea Aca. Ind. Coop. Soc. Accepted(2013) https://doi.org/10.5762/KAIS.2013.14.12.6098
  8. VersaSTAT3, Potentiostat/Galvanostat, Princeton Applied Research, AMETEK Inc.
  9. KS L 1604, Fine ceramics-Determination of thermal diffusivity, specific heat capacity, and thermal conductivity of monolithic ceramics by laser flash method, Kor. Ind. Stand, 2012
  10. LFA447 NanoFlash, Thermal Diffusivity Measurement, NETZSCH