CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

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Chapter 6 for the duplex coating, and greater resistance offered to the charge accumulation on the coated surface. The circuit parameters for the uncoated, and duplex Ti-TiO 2 coated specimen evaluated using circuit models as shown in Fig. 3.10a-b are given in Table. 6.5. Conc. Fig. 6.15d: Log f vs. Log |Z| for uncoated and Ti-TiO 2 coated 304L SS in 8 M HNO 3 . Substrate condition R s cm 2 CPE 2 R ct2 cm 2 CPE 1 R ct1 cm 2 C dl2 -1 cm -2 S n n (0-1) C dl1 -1 cm -2 S n n (0-1) 1 M Uncoated 2 6.5×10 -5 0.86 9.35×10 2 - - - 1 M Ti-TiO 2 coated 11 1.7×10 -7 0.91 1.24×10 6 1.3×10 -8 0.98 1.1×10 3 8 M Uncoated 1 5.8×10 -4 0.65 1.1×10 2 - - - 8 M Ti-TiO 2 coated 12 2.6×10 -5 0.78 1.8×10 4 1.8×10 -6 0.88 2.8×10 2 Table. 6.5: EIS fitted values for uncoated and duplex Ti-TiO 2 coated 304L SS in 1 M and 8 M HNO 3 . Form the circuit parameters, it is obvious that coating resistance or pore resistance (R ct1 ) greatly improves in both the test solution with duplex coating which has not been observed either for Ti or TiO 2 single layer coating. Apart from this, the coating capacitance (C dl1 ) also showed
Chapter 6 vary low capacitance value in both medium of investigation which indicates high insulating property of the passive film developed on the coated surface. The enhancement in pore resistance, and coating capacitance properties also has been reflected in the double layer capacitance, and polarization resistance at the coating-substrate interface. As compared to Ti and TiO 2 coating, the capacitance was low indicating presence of good protective oxide film at the interface, and the polarization resistance was also quite high showing large polarization resistance. 6.2.3.4 Potentiodynamic polarization study The potentiodynamic polarization for the uncoated, and duplex Ti-TiO 2 coated 304L SS specimens in 1 M and 8 M nitric acid are shown in Fig. 6.16a-b. The polarization curves in both the medium of investigation showed shifting of corrosion potential in noble direction with very low passive current density, and considerable improvement in transpassive potential compared to Ti and TiO 2 single layer coating. Fig. 6.16a: Polarization study of uncoated and duplex Ti-TiO 2 coated 304L SS in 1 M HNO 3 .
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2.3 Effect of alloying elements on
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6.2.3.2 Open circuit potential vs.
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eprocessing can be recovered, and c
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The ex-situ study of passive film w
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Fig.3.10: Schematic of electrical e
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Fig.6.11: Polarization study of unc
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AISI: American Institute of Steel I
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Chapter 1 C H A P T E R 1 Spent Nuc
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Chapter 1 1.3 Challenges in spent n
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Chapter 1 corrosion resistance. The
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Chapter 1 choice of zirconium is du
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C H A P T E R2
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Chapter 2 temperature, (c) higher i
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Chapter 2 Chromium in excess of 12
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Chapter 2 2. 3 Effect of alloying e
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Chapter 2 The twins are identified
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Chapter 2 and at temperature around
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Chapter 2 of adsorption of oxygen o
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Chapter 2 transpassive dissolution
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Chapter 2 healing chromium oxide fi
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Chapter 2 their segregation to the
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Chapter 2 is intimately related to
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Chapter 2 in nature because the dis
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C H A P T E R3
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Chapter 3 3.1.1.2 Specimen preparat
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Chapter 3 ionized. However, differe
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Chapter 3 various industrial applic
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Chapter 3 In the present investigat
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Chapter 3 3.1.3.2 Atomic force micr
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Chapter 3 present on the surface fo
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Chapter 3 necessary condition is th
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Chapter 3 Y m is the sputter yield.
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Chapter 3 Fig. 3.7: Schematic of X-
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Chapter 3 rate of 10Å/min using 5
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Chapter 3 different doses of nitrog
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Chapter 3 The modulus of electroche
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Chapter 3 equivalent circuit as sho
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Chapter 3 reference electrode with
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Chapter 3 for understanding the pas
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C H A P T E R4
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Chapter 4 encountered by all materi
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Chapter 4 pitting, and intergranula
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Chapter 4 The ridged structure, and
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Chapter 4 nitric acid is that the b
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Chapter 4 Potential (V) Vs Ag/AgCl
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Chapter 4 4.2.3 In-situ electrochem
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Chapter 4 The surface morphologies
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Chapter 4 a b c d Opening up of gra
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Chapter 4 Intensity (Arbitrary unit
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Chapter 4 The chromium, and oxygen
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Chapter 4 Intensity (Arbitrary unit
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C H A P T E R5
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Chapter 5 elements, and often impar
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Chapter 5 5.2 Results and discussi
Page 118 and 119: Chapter 5 Presence of oxygen is due
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Page 122 and 123: Chapter 5 formation of Cr 2 N was a
Page 124 and 125: Chapter 5 electrochemical environme
Page 126 and 127: Chapter 5 N + Dose E corr (mV vs. A
Page 128 and 129: Chapter 5 layer capacitance (C dl )
Page 130 and 131: Chapter 5 correlation between surfa
Page 132 and 133: Chapter 5 boundary dissolution was
Page 134 and 135: Chapter 6 C H A P T E R 6
Page 136 and 137: Chapter 6 193]. As a single phase c
Page 138 and 139: Chapter 6 particles range from 8×1
Page 140 and 141: Chapter 6 Results revealed that in
Page 142 and 143: Chapter 6 The change over from capa
Page 144 and 145: Chapter 6 The impedance parameters
Page 146 and 147: Chapter 6 Conc. Substrate condition
Page 148 and 149: Chapter 6 6.6a-d. The uncoated spec
Page 150 and 151: Chapter 6 (55.18°) respectively, w
Page 152 and 153: Chapter 6 OCP shifted in noble dire
Page 154 and 155: Chapter 6 The high phase angle over
Page 156 and 157: Chapter 6 Fig. 6.10d: Log f vs. Log
Page 158 and 159: Chapter 6 Fig. 6.11b: Polarization
Page 160 and 161: Chapter 6 Covalent aspect of lattic
Page 162 and 163: Chapter 6 As compared to uncoated s
Page 164 and 165: Chapter 6 6.2.3.2 Open circuit pote
Page 166 and 167: Chapter 6 Similarly, the plots for
Page 170 and 171: Chapter 6 Fig.6.16b: Polarization s
Page 172 and 173: Chapter 6 6.2.3.5 Morphological exa
Page 174 and 175: Chapter 7 C H A P T E R 7 The cha
Page 176 and 177: Chapter 7 1. Surface morphology exa
Page 178 and 179: Chapter 7 6 Duplex Ti-TiO 2 coated
Page 180 and 181: Chapter 7 EC-SPM study on effect
Page 183 and 184: [1] Baldev Raj, U. Kamachi Mudali,
Page 185 and 186: [37] G. Okamoto, T. Shibata, Corros
Page 187 and 188: [79] M. Moens, M. Van Craen, F.C. A
Page 189 and 190: [117] R.E.Williford, C.F.Windisch J
Page 191 and 192: [157] N. Mottu, M. Vayer, R. Erre,
Page 193: [197] M. Metikos Hukovic, M. Ceraj
Page 196 and 197: [19] H. H. Uhlig, Corros Sci, 19 (1
Page 198 and 199: [57] J. F. Ziegler, J. P. Biersack,
Page 200 and 201: [97] I. Betova, M. Bojinov, V. Kara
Page 202 and 203: [139] V. Ashworth, R. P. M. Procter
Page 204 and 205: [176] G. Frankel, G. Grundmeier, H.
Page 207 and 208: List of publications 1. Referred
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CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

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