Carbon fiber reinforced plastics (CFRP) are promising lightweight materials for vehicle applications while there is a concern of galvanic corrosion when carbon fiber composite materials are connected with other metals. The galvanic corrosion behaviors were studied between CFRP and aluminum alloys in this paper. Several techniques were applied including potentiodynamic polarization test (PPT), galvanic corrosion current test (GCT), and immersion test (IT). It yielded that there existed obvious galvanic corrosion between CFRP and aluminum alloys. Additionally, influences of different surface conditions, carbon fiber concentrations, and substrate materials on the galvanic corrosion behavior were compared and discussed. Carbon fiber concentrations determine the conductivity of the CFRPs, that will have an impact on the corrosion behaviors. The exposure of the carbon fiber attributed to the polishing process will increase the corrosion rate, which confirms the importance of the elongation and hydroscopicity of the carbon fibers.
Carbon fiber reinforced plastics (CFRP) are promising lightweight materials for vehicle applications. 316L is one of the most widely used types of austenite stainless steels and applied in lots of automotive applications. The existence of crevices will result in galvanic corrosion and crevice corrosion when CFRPs and 316L are directly connected. A crevice former for the galvanic system was therefore designed and applied to evaluate the crevice corrosion behaviors and study the mechanism of galvanic crevice corrosion through several electrochemical techniques in this research. The results showed that the crevice corrosion of galvanic systems grew from crevice mouth to the inside crevice and could be divided into four steps, metastable pitting corrosion at the crevice mouth, initiating step of crevice corrosion, propagating step and ending step of crevice corrosion. Because of the influences of the galvanic system, electrode reaction rates were speeded up and the passivation region was shortened at the initiating stage of crevice corrosion. Corrosion rate was observed to be higher in the galvanic system than that in normal crevice systems.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.