CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

Chapter 6
opening up of the pores on the surface however, the particles were not detached from the surface
indicating protecting ability up to certain extent. The morphology of the Ti coated specimen after
polarization in 8 M nitric acid (Fig. 6.6d) showed significant depletion of the particles from the
coated surface showing grain boundary regions of the base material, nevertheless very few
particles sticking to the surface can also be noticed. Overall, the Ti coated 304L SS specimens in 1
M nitric acid showed resistance to surface dissolution of the base material, whereas in 8 M nitric
acid depletion of the coated surface as well as attack on the base material were observed.
6.2.2 Corrosion behaviour of TiO 2 coated 304L SS in nitric acid medium
6.2.2.1 Phase and morphology characterization
The GIXRD analysis of sputter deposited f TiO 2 coated 304L SS specimens is shown in
Fig. 6.7.
Fig. 6.7: GIXRD pattern of TiO 2 coated 304L SS [22].
The GIXRD pattern of the TiO 2 coated 304L SS surface revealed anatase phase. According
to the standard PCPDF (89-4921) data base, and available literature the peak positions assigned
were A (1 0 1) (25.35°), A (0 0 4) (37.84°), A (2 0 0) (48.15°), A (1 0 5) (53.97°) and A (2 1 1)