(Downloads - 0)
For more info about our services contact : help@bestpfe.com
Table of contents
ACKNOWLEDGMENTS
LIST OF ACRONYMS & SYMBOLS
LIST OF FIGURES & TABLES
CHAPTER I: INTRODUCTION & STATE OF THE ART
1. INTRODUCTION
2. STATE OF THE ART
2.1. Generalities on Aluminum
2.2. Age hardening and thermal treatment.
2.3. Aluminum 2024-T3: microstructure
2.4. Alloy processing and effect of rolling on the surface microstructure
2.5. The corrosion behavior of AA2024-T3
2.5.1. The pitting corrosion of Aluminum
2.5.2. Intergranular corrosion
2.5.3. The effect of the S-phase particle (Al2CuMg)
2.5.4. The effect of the 𝜽 phase (Al2Cu)
2.5.5. The effect of Al7Cu2Fe and Al-Cu-Fe-Mn particles
2.6. Aluminum-Lithium alloys: microstructure
2.7. The corrosion behavior of AA2050-T3
2.7.1. Intergranular corrosion (IGC)
2.7.2. Stress corrosion cracking (SCC)
2.7.3. The effect of age hardening on the corrosion properties
3. THE SURFACE TREATMENT OF AL-ALLOYS
3.1. Solvent cleaning
3.2. Alkaline cleaning
3.3. Acid deoxidizer (acid pickling)
4. MOTIVATION AND OBJECTIVES OF THE THESIS
CHAPTER II: MATERIALS & METHODS
1. INTRODUCTION
2. MATERIALS & METHODS
2.1. Part A: The flow cell and electrolyte transportation.
2.1.1. The electrochemical flow cell
2.1.2. Flow injection valve system
2.2. Part B: The inductively coupled plasma atomic emission spectrometer (ICP-AES) .
2.2.1. Electrolyte introduction system
2.2.2. Internal standard and second peristaltic pump
2.2.3. Plasma: excitation source of the ICP-AES
2.2.4. Dispersive system
2.3. Part C: Element quantification and AESEC data treatment
2.3.1. Concentration, flow rate and convolution.
2.3.2. Hydrodynamics
2.4. Sample preparation
2.5. Electrochemical characterization
2.5.1. Potentiodynamic polarization curves
2.6. Surface ex-situ characterization techniques
2.6.1. Scanning electron microscopy (SEM)
2.6.2. Focused Ion Beam (FIB)
2.6.3. Glow discharge optical emission spectrometer (GDOES)
2.6.4. Profilometry
2.6.5. X-ray photoelectron spectroscopy (XPS)
2.6.6. Vibrational spectroscopy
2.6.7. X-ray diffraction (XRD)
CHAPTER III: IN SITU MONITORING OF ALLOY DISSOLUTION AND RESIDUAL FILM FORMATION DURING THE PRETREATMENT OF AL-ALLOY 2024-T3.
1. INTRODUCTION
2. EXPERIMENTAL
3. RESULTS AND DISCUSSION
3.1. In situ measurement of AA2024 pretreatment kinetics
3.2. Microstructural analysis of pretreated surfaces
3.3. Kinetics of Cu rich Particle Release in NaOH
3.4. Dissolution and passivation in HNO3
3.5. Polarization Behavior prior to, and following, pretreatment
4. CONCLUSIONS
5. APPENDIX
5.1. Hydrodynamics
5.2. Surface topography and etching rate
CHAPTER IV: ON-LINE REACTIVITY MEASUREMENT OF AL-LI ALLOY AA2050-T3 DURING A SURFACE PRETREATMENT SEQUENCE USING AESEC
1. INTRODUCTION
2. EXPERIMENTAL
3. RESULTS
3.1. Dissolution profile AA2050-T3 under pretreatment sequence
3.2. Reactivity of AA2050-T3 under HNO3 exposure
3.3. Microstructural analysis of AA2050-T3 before and after pretreatment
3.4. Particle detection under NaOH exposure
3.5. AESEC polarization curves prior & after pretreatment
3.6. GDOES profiles of the surface after pretreatment and polarization curves
3.7. Potentiodynamic polarization curve of AA2024-T3 in 0.5 M NaCl with the addition of 1 ppm of Li
4. DISCUSSION
5. CONCLUSIONS
CHAPTER V: CHARACTERIZATION OF AN AL-BASED CORROSION PRODUCT AFTER THE ANODIC POLARIZATION OF AN AL-LI ALLOY
1. INTRODUCTION
2. EXPERIMENTAL
3. RESULTS
3.1. GDOES analysis of the corroded surface
3.2. X-ray diffraction analysis of AA2050 prior and after corrosion testing
3.3. Identification of amorphous corrosion products by Raman spectroscopy
3.4. Complementary analysis of the corrosion product by Infrared spectroscopy
4. DISCUSSION
5. CONCLUSIONS
PRELIMINARY STUDIES & CONCLUSIONS
1. PRELIMINARY STUDIES
1.1. The pretreatment of intermetallic particles: the reactivity of S phase.
1.2. The statistical analysis of particle detachment: establishment of relationships between elements, signal intensities and particle nature.
2. CONCLUSIONS
2.1. General conclusions
2.2. Perspectives
REFERENCES
