CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

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Chapter 7 EC-SPM study on effect of temperature on the passive film morphology, stability and degradation of 304L stainless steel in nitric acid medium. The present work, and existing literatures gives qualitative and quantitative information regarding the passive film property under in-situ condition in nitric acid medium at room temperature condition. However, variation in temperature has major role on the passive film properties such as nucleation and growth, formation and stability, change in donor-acceptor density with change in activation energy, active-passive transition behaviour etc. As nucleation and propagation of localized corrosion is related to the above mentioned properties, establishment of a correlation between protective properties of the passive film as a function temperature is vital in elucidating the many details of temperature effect on the corrosion behaviour of 304L SS in nitric acid medium. EC-SPM can play a significant role in understanding the in-situ process of nucleation and growth of passive film at different temperature condition. Morphological investigation in association with other electrochemical, and surface analytical investigation can bring out the “effect of temperature on the passive film and corrosion aspect of 304L stainless steel in nitric acid medium”. EC-SPM study of passive film of 304L stainless steel in mixed solution of nitric acid containing oxidizing ions. Oxidizing ions have greater influence on the corrosion resistance of austenitic stainless steel as they shift the corrosion potential to the transpassive domain. Since corrosion potential shifts to transpassive potential the passive film property as well as its dissolution rate also changes in the presence oxidizing ions. Oxidizing ions also change the rate of cathodic and anodic reaction rates. The rate of these reactions on the morphological consideration of the passive film has to be
Chapter 7 analyzed under in-situ condition using EC-SPM for through analysis of the “corrosion behaviour of 304L SS in nitric acid medium containing oxidizing ions”. Moreover, using in-situ EC-SPM, the optimum concentration of oxidizing ions for the formation of a stable passive film can be analyzed by monitoring passive film morphology as a function of concentration of oxidizing ions. Comparison of passive film morphology of 304L stainless steel with Nitric Acid Grade (NAG) stainless steel using EC-SPM. Nitric acid grade stainless steel possess good corrosion resistance as compared to 304L SS in nitric acid medium which is attributed to high chromium content and tighter control of impurity level. The comparison of the passive films developed in in-situ condition on both the alloys using EC-SPM will provide morphological aspect on the passive film formation and degradation in nitric acid medium.
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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
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Chapter 5 Presence of oxygen is due
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Chapter 5 was an increase in marten
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Chapter 5 formation of Cr 2 N was a
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Chapter 5 electrochemical environme
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Chapter 5 N + Dose E corr (mV vs. A
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Chapter 5 layer capacitance (C dl )
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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
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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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