This study aims to propose a simple experimental method to distinguish the galvanic corrosion, crevice corrosion and self-corrosion in metal/carbon fiber reinforced polymer (CFRP) joints.Design/methodology/approachThe corrosion behaviors of four different galvanic couples, whose anodes were Zn-coated DP590 steel and Al 6022, and cathodes were two kinds of CFRP, were investigated in immersion and GMW14872 cyclic conditions.FindingsThe results showed that the galvanic corrosion caused by direct contact between CFRP and metals was more serious than that caused by the jointing bolts. The corrosion damage caused by crevice corrosion was severer than that caused by galvanic corrosion. Self-corrosion was also significant, particularly under the cyclic salt spray condition.Practical implicationsCyclic salt spray test may more reliably simulate the galvanic corrosion of a joint in industrial service environments, and real corrosion damage may be underestimated by a galvanic current measurement.Originality/valueA deeper understanding of different corrosion mechanisms involved in CFRP/metal joints under different service conditions in industry has been given.
Anti-Corrosion Methods and Materials – Emerald Publishing
Published: Aug 9, 2019
Keywords: Immersion; Carbon fiber reinforced polymer; Crevice corrosion; Cyclic salt spray; Galvanic corrosion; Self-corrosion