Fig. 7: SEM micrographs of keyhole-induced corrosion damage.

a Fully developed site, (b) partially developed site, (c, d) incipient site, (d) shows a FIB cross-section of (c) tilted to 52°.

a Fully developed site, (b) partially developed site, (c, d) incipient site, (d) shows a FIB cross-section of (c) tilted to 52°.