Galvanic Corrosion of Carbon Fiber Epoxy Composite Coupled with LY12 Al Alloy

The galvanic corrosion behavior between carbon fiber composite material and LY12 aluminum alloy was studied in NaCl solution. The results indicate that there was serious galvanic corrosion when the two kinds of materials were coupled in NaCl solution. The galvanic current was evidently affected by environmental temperature, electrolyte concentration and pH of electrolyte. As the coupled time increased, the galvanic current became lower. However, the galvanic current increased in the beginning then reduced lightly; finally it kept an upper level in the acid and alkaline solutions. The galvanic corrosion current was the least in the neutral solution. The surface of corrosive LY12 aluminum alloy had obvious pit corrosion hole, the region of corrosion became much more flat.