Figure 5

SEM images taken from (a) the surface and (b) cross section of FIB-cut corroded area of the PEO-500; The surface of (d) PEO-600 and (e) PEO-700 samples after galvanic coupling with CFRP in 3.5 wt% NaCl solution; Schematic diagrams showing the GC mechanisms of (c) PEO-500 and (f) PEO-600 samples;