Abstract: The front surface (FS) specimen and side surface (SS) specimen of CF8611/AC531 composite and the polarization test of them in the electrolyte with 3.5% NaCl+12.5% Cu2SO4 were designed. By means of the electrochemical workstation, scanning electron microscope, energy spectrometer and other devices, the potentiodynamic polarization curves and galvanic corrosion parameters of the composite and 7B04-T74 aluminum alloy in different electrolytes were measured, meanwhile the microstructure and component were observed and analyzed. Based on the steady corrosion field and the parametric scanning technology, a dynamic model for galvanic corrosion under the wear status of composite was established by Comsol software. The results show that, the perfor-mance of the composite is stable, but there are some carbon fiber exposed defects on the original surface. The cathodic reaction rate is closely related to the area of exposed carbon fiber, and the surface of the composite is divided into the active cathode region and inert cathode region. The main corrosion form of the aluminum alloy is pitting when coupled with composite, and no failure of composite. The galvanic corrosion model established here is valid and available. There is a positive linear correlation between the total galvanic current and the exposed area of carbon fiber, the formula is Ig=(2.794 1S+62.994)×10-7. When the area ratio of FS to SS is about 5.53∶1, the galvanic effect of them to the aluminum alloy is the same. Three reasons which will reduce the failure risk of the composite in galvanic corrosion are gave out.
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2018, Vol. 32 
