알루미늄 기지 자동차에 쓰이는 탄소강 리벳과 그라파이트간의 갈바닉 부식 방지 연구

Abstract

Aluminum alloy matrix may be used for manufacturing lighter automobiles. However, galvanic corrosionmay occur between the rivet joint combining aluminum alloy matrix and a CFRP (carbon fiber reinforcedplastic) laminate. The possibility of galvanic corrosion may be investigated by measuring galvanic couplecurrents. Two types of galvanic current measuring methods were used. One method is to use potentiodynamicpolarization curves and the other is the ZRA (zero resistance ammeter) method. For galvanic corrosionexperiments graphite, a major component of CFRP, was used with carbon steel (rivets) and 6061 aluminumalloys. Regardless of carbon steel, Ni deposited carbon steel, and 316L stainless steels we also investigatedthe possibility of reduction in galvanic corrosion. Results revealed that even though Ni deposited carbonsteel or 316L stainless rivet may slightly increase galvanic current density between those and Al matrix,substitute rivets for carbon steel may be considerably useful for reducing overall galvanic corrosion.