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Effect of Area Ratio on Galvanic Corrosion Between Metallic Materials and GECM in 3.5% NaCl Solution

3.5% NaCl 수용액 중에서의 금속과 GECM의 갈바닉 부식에 미치는 면적비의 영향

  • Kim, Y.S. (The Center of Green Materials Technology, School of Advanced Materials Engineering, Andong National University) ;
  • Lim, H.K. (The Center of Green Materials Technology, School of Advanced Materials Engineering, Andong National University) ;
  • Sohn, Y.I. (Agency For Defense Development, The 1st R&D Institute) ;
  • Yoo, Y.R. (Electronics and Telecommunications Research Institute) ;
  • Chang, H.Y. (Korea Power Engineering Company)
  • 김영식 (국립안동대학교 신소재공학부 청정소재기술연구센터) ;
  • 임현권 (국립안동대학교 신소재공학부 청정소재기술연구센터) ;
  • 손영일 (국방과학연구소) ;
  • 유영란 (한국전자통신연구소) ;
  • 장현영 (한국전력기술주식회사)
  • Received : 2010.02.01
  • Accepted : 2010.02.17
  • Published : 2010.02.01

Abstract

Galvanic coupling between GECM(graphite epoxy composite material) and metallic materials can facilitate corrosion of metals and alloys because GECM is noble and electrically conductive. Galvanic corrosion is affected by many factors including metallic materials, area ratio, surface condition, and corrosivity. This work aims to evaluate the effect of area ratio on galvanic corrosion between GECM and several metals. In the case of glavanic coupling of carbon steel and Al to GECM, corrosion rate increased with increasing area ratio. Corrosion rate of sensitized STS 316S stainless steel decreased a little at an area ratio 1:1 but increased at an area ratio 30:1. It is considered to be due to that area ratio affects galvanic corrosion more in less corrosion resistant alloys. However, in case of STS 316 and Ti, galvanic coupling reduces corrosion rate by the formation of passive film.

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