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SEM images illustrating the electrode surface of three Pt electrodes taken from an electrode array chronically stimulated at a level of 200 μC/cm2/phase and 1000 pps (cohort 3; Table 1). (a) Electrode E1 was unstimulated and had a corrosion grade of 0. (b) Electrode E6 was a flanker electrode and had slight Pt corrosion (grade 2). (c) Electrode E7 was a centre electrode and exhibited extensive pitting corrosion across the Pt surface (grade 4). Scale bar = 20 μm.
