탄소강 볼트 체결된 GECM(Graphite Epoxy Composite Material)/Al 판재의 구성 부재의 부식 거동

Abstract

(Received October 23, 2012; Revised December 06, 2012; Accepted December 06, 2012)This work focused on corrosion of carbon steel bolted GECM/Al parts in tap water and NaCl solutions. In tapwater and NaCl solutions, open circuit potential of GECM and its potentials in a series of carbon steel bolt>Ti>Albecame active. Regardless of test materials, open circuit potentials in tap water were noble, and increasing NaClconcentration, its potentials became active. Immersion test of single specimen showed that no corrosion occurin Ti and GECM. In tap water, carbon steel bolt didn't show red corrosion product and in chloride solutions,corrosion rate in 1% NaCl solution was greater than its rate in 3.5% NaCl solution and red corrosion productin 1% NaCl solution was earlier observed than that in 3.5% NaCl solution. It seems that this behavior wouldbe related to zinc-coatings on the surface of carbon stee l bolt. On the other hand, aluminium was corrodedin tap water and chloride solutions. Corrosion of aluminium in tap water was due to the presence of chlorideion in tap water by sterilizing process.