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Influence of Graphite Epoxy Composite Material on the Electrochemical Galvanic Corrosion of Metals  

Yoo, Y.R. (The Center of Green Materials Technology, School of Advanced Materials Engineering, Andong National University)
Son, Y.I. (Agency For Defense Development)
Shim, G.T. (The Center of Green Materials Technology, School of Advanced Materials Engineering, Andong National University)
Kwon, Y.H. (The Center of Green Materials Technology, School of Advanced Materials Engineering, Andong National University)
Kim, Y.S. (The Center of Green Materials Technology, School of Advanced Materials Engineering, Andong National University)
Publication Information
Corrosion Science and Technology / v.8, no.1, 2009 , pp. 27-39 More about this Journal
Abstract
Non metallic composite materials, for example, GECM(graphite epoxy composite material) show high specific strength because of low density. These kinds of non metallic composite materials improved the structural effectiveness and operation economics. However, if these materials contacted several metals, corrosion can be arisen since non metallic composite materials have electrical conductivity. This paper dealt with galvanic corrosion between graphite epoxy composite material and several metals. Base on the electrochemical galvanic corrosion test between GECM and metals, corrosion current of carbon steel and aluminium increased with time but corrosion current of stainless steels and titanium decreased and galvanic potential increased. This behavior shows the galvanic corrosion depends upon the presence of passive film. Also, galvanic effect of GECM coupled with ferrous alloys and non-ferrous alloys was lower than that of 100% graphite, which is attributed to lower exposed area of graphite fiber in the GECM than apparent area of the GECM specimen used for the calculation of galvanic current in this work.
Keywords
galvanic corrosion; GECM; graphite; anodic polarization behavior;
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