CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

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Chapter 6 The impedance parameters for uncoated, and Ti coated 304L SS in 1 M and 8 M nitric acid obtained by fitting with circuit models as mentioned in Fig. 3.10a-b are shown in Table. 6.1. From Table. 6.1, it is clear that Ti coated 304L SS specimens showed improvement in polarization resistance (R ct2 ) as compared to uncoated condition, however the polarization resistance of Ti coated specimen in 8 M nitric acid was much lower as compared to that of 1 M nitric acid. Moreover, the pore resistance (R ct1 ) in 8 M nitric acid was also significantly lower compared to 1 M nitric acid, which shows increasing charge transfer process, and anodic activities at structural heterogeneities in the coating-substrate interface. The stability of the coating in corrosive solution is determined by the coating capacitance, and in general lower the coating capacitance value higher is the stability signifying insulating nature [199]. In 1 M nitric acid, the coating capacitance (C dl1 ) showed lower capacitance value which indicates low amount of retained charge on the coated surface. However with increasing concentration (8 M), the retained charge capacity increased which showed higher capacitance value. The double layer capacitance (C dl2 ) for Ti coated 304L SS specimens also showed lower capacitance value in 1 M nitric acid, which indicates good passive film stability at the coating-substrate interface. Increase in C dl2 value was observed at higher concentration (8 M) indicating decreasing passive film stability at the coatingsubstrate interface with increasing oxidizing nature. Conc. 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 0.76 9.35×10 2 - - - 1 M Ti coated 5 4.6×10 -5 0.83 2.13×10 4 6.5×10 -6 0.84 4×10 2 8 M Uncoated 1 5.8×10 -4 0.65 1.8×10 2 - - - 8 M Ti coated 2 8.2×10 -5 0.71 4×10 2 2.7×10 -5 0.76 1×10 1 Table. 6.1: EIS fitted values for the uncoated and Ti coated 304L SS in 1 M and 8 M HNO 3 .
Chapter 6 6.2.1.4 Potentiodynamic polarization study The results for potentiodynamic polarization study for uncoated and Ti coated 304L SS in 1 M and 8 M nitric acid are shown in Fig. 6.5a-b. The quantitative value of the polarization parameters obtained for uncoated, and Ti coated 304L SS specimens in both the test solutions are summarized in Table. 6.2. Fig. 6.5a: Polarization study for uncoated and Ti coated 304L SS in 1 HNO 3 . Fig. 6.5b: Polarization study for uncoated and Ti coated 304L SS in 8 M HNO 3 .
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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
Page 94 and 95: Chapter 4 The ridged structure, and
Page 96 and 97: Chapter 4 nitric acid is that the b
Page 98 and 99: Chapter 4 Potential (V) Vs Ag/AgCl
Page 100 and 101: Chapter 4 4.2.3 In-situ electrochem
Page 102 and 103: Chapter 4 The surface morphologies
Page 104 and 105: Chapter 4 a b c d Opening up of gra
Page 106 and 107: Chapter 4 Intensity (Arbitrary unit
Page 108 and 109: Chapter 4 The chromium, and oxygen
Page 110 and 111: Chapter 4 Intensity (Arbitrary unit
Page 112 and 113: 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 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 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
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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
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[19] H. H. Uhlig, Corros Sci, 19 (1
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[57] J. F. Ziegler, J. P. Biersack,
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[97] I. Betova, M. Bojinov, V. Kara
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[139] V. Ashworth, R. P. M. Procter
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[176] G. Frankel, G. Grundmeier, H.
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List of publications 1. Referred
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CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

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