Fig. 5

FESEM images of the coatings before (a1–e1) and after electrochemical measurement (a2–e2): (a) Pure HA, (b) HA/T, (c) 5Co/HA/T, (d) 10Co/HA/T, and (e) 20Co/HA/T.

FESEM images of the coatings before (a1–e1) and after electrochemical measurement (a2–e2): (a) Pure HA, (b) HA/T, (c) 5Co/HA/T, (d) 10Co/HA/T, and (e) 20Co/HA/T.