CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

Chapter 4
4.2.3 In-situ electrochemical AFM surface morphology study
The results for in-situ passive film surface morphology study using EC-AFM of 304L SS
in 0.1 M, 0.5 M, 0.6 M and 1 M HNO 3 up to 1100 mV (Ag/AgCl) at a particular location of the
specimen i.e. without changing specimen position are shown in Fig. 4.6-4.9. The justification for
showing morphology up to 1100 mV (Ag/AgCl) is because contrasting surface features were
observed up to this potential, and especially around 1100 mV. Figure. 4.6a-d represents the
surface morphology of 304L SS under immersion condition in 0.1 M nitric acid solution in as
polished, 500 mV (Ag/AgCl), 900 mV (Ag/AgCl), and 1100 mV (Ag/AgCl), respectively [20].
a
b
c
d
Fig. 4.6: In-situ surface morphology of 304L SS in 0.1 M HNO 3 , (a) as polished, (b) 500 mV,
(c) 900 mV and (d) 1100 mV vs. Ag/AgCl [20]