CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

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Chapter 6 6.2.3.2 Open circuit potential vs. time measurement The results of OCP vs. time measurement for uncoated, and duplex Ti-TiO 2 coated 304L SS in 1 M and 8 M nitric acid are shown in Fig. 6.14a-b. As observed earlier for the investigations with Ti and TiO 2 coated specimens, the uncoated specimens showed steady state potential with increase in immersion time, and the OCP was higher for 8 M nitric acid. The OCP for duplex Ti- TiO 2 coated specimens in 1 M nitric acid gradually increased, and attained steady state with increase in immersion time. Fig. 6.14a: OCP vs. time measurement for uncoated and duplex Ti-TiO 2 coated 304L SS in 1 M HNO 3 . Steady improvement as well as attainment of stable OCP shows the effectiveness of fine grained duplex coating in minimizing the frequency of pore formation and columnar boundaries, and improving the passivation property [207]. Moreover, successive layers in duplex coating restricts the ingress of the solution, and provides stability at the coating-substrate interface giving inherent advantage over single layer coating. In 8 M nitric acid also the OCP was higher, and
Chapter 6 showed steady improvement with increase in time, however transient points were observed prior to attainment of steady state which could be due to competitive passive film formation and dissolution at the few existing structural heterogeneities such as pinholes and inter-columnar boundaries causing increase in oxidizing ability. Fig. 6.14b: OCP vs. time measurement for uncoated and Ti-TiO 2 coated 304L SS in 8 M HNO 3 . 6.2.3.3 Electrochemical impedance analysis The results of electrochemical impedance analysis for uncoated, and Ti-TiO 2 coated 304L SS in 1 M and 8 M nitric acid in OCP condition are shown in Fig. 6.15a-d. As mentioned earlier, the fitted graphs obtained using electrical equivalent circuit model as shown in Fig. 3.10a-b are also shown in Fig. 6.15a-d. The plot of phase angle () vs. frequency in 1 M nitric acid largely revealed near capacitive property in the entire frequency domain of investigation with one time constant feature which shows the formation of very stable passive film as well as resistance to alteration in property and initiation of anodic activities on the coated surface (Fig. 6.15a) [208].
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2.3 Effect of alloying elements on
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4 C H A P T E R 4 73 # $%&' 4.1 In
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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
Page 114 and 115: Chapter 5 elements, and often impar
Page 116 and 117: Chapter 5 5.2 Results and discussi
Page 118 and 119: Chapter 5 Presence of oxygen is due
Page 120 and 121: Chapter 5 was an increase in marten
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 166 and 167: Chapter 6 Similarly, the plots for
Page 168 and 169: Chapter 6 for the duplex coating, a
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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