CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

Chapter 4
The results showed the growth of particles at 500 mV (Ag/AgCl), increase in size of the
particle around 900 mV (Ag/AgCl), and acquired the shape of platelet [20,126] in the form of
moiré-pattern around 1100 mV (Ag/AgCl). Moire-pattern is a growth process of successive layer
in a stalking fashion, and arises due to small variation in the atomic scale. This type of growth
mode of the platelets in aqueous solutions occurs in the nano-scopic regions of alloy-solution
interface, and has been correlated with the growth of oxide layer by Viginal et al using limit height
method [126]. Figure. 4.7a-d represents the surface morphology of 304L SS inside 0.5 M nitric
acid solution in as polished, 500 mV (Ag/AgCl), 900 mV (Ag/AgCl), and 1100 mV (Ag/AgCl),
respectively.
a
b
c
d
Fig. 4.7: In-situ surface morphology of 304L SS in 0.5 M HNO 3 (a) as polished, (b) 500 mV,
(c) 900 mV and (d) 1100 mV vs. Ag/AgCl [20].