CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

Chapter 3
E −ECorr
= Ba
I I Corr
+ 10
Protection efficiency of Ti, TiO 2 and duplex Ti-TiO 2 coating in nitric acid medium was
evaluated using Eq. 13 to understand their performance in nitric acid medium [107].
E −ECorr
−
Bc
10
(12)
Protection efficiency (%) =
0 1233 40 1233"1%
0 1233
× 100 (13)
Where, Icorr and Icorr(c), are the corrosion current density of uncoated and coated 304L SS
in different concentration of nitric acid.
3.1.5.4 Electrochemical atomic force microscopy
Electrochemical atomic force microscope (EC-AFM) is one of the potential surface
investigation techniques to study the in-situ electrode-electrolyte interface, and in recent years it
has significantly contributed in understanding physico-chemical phenomenon of electrochemical
process in different electrochemical environments. The main advantage of EC-AFM is that, the
working electrode can be conductor or insulator. The ability to probe the local character at submicroscopic
level of the electrode-electrolyte interface with potentiostatic control has advanced its
applications in various fields of fundamental and applied research in material science, biological
science, physical and chemical science. Included in such type of studies are structure-reactivity of
electrode surface, electro-deposition, surface reconstructions, adsorption on surfaces, corrosion
and study of biological specimens in near physiological conditions [108-111]. Out of several
interesting applications of EC-AFM, one of the important fields of study is the process of
corrosion of different materials in simulated environments. To date its application is wide spread