| 学位论文数据集 | 第4-6页 |
| Abstract | 第6-7页 |
| 摘要 | 第8-13页 |
| CHAPTER 1:INTRODUCTION | 第13-27页 |
| 1.1 Chromium coating | 第13页 |
| 1.2 Trivalent chromium coating | 第13-17页 |
| 1.2.1 Development of trivalent electroplating process | 第14-15页 |
| 1.2.2 Preparation of Chromium trivalent electrolyte | 第15页 |
| 1.2.3 Trivalent chromium bath additives | 第15-16页 |
| 1.2.4 Recent development and ingredients used in Cr(Ⅲ) electrolyte | 第16-17页 |
| 1.3 Crack formation & prevention method | 第17页 |
| 1.4 Problems during trivalent chromium coating process | 第17-19页 |
| 1.4.1 Coating thickness | 第18页 |
| 1.4.2 Influence of pH | 第18-19页 |
| 1.4.3 Effects of operating temperature | 第19页 |
| 1.5 Properties of trivalent chromium coating | 第19-20页 |
| 1.6 Corrosion properties of trivalent chromium coating | 第20-21页 |
| 1.7 Coupling of active metal to noble metal | 第21-22页 |
| 1.8 Development of the Pd film | 第22-23页 |
| 1.8.1 Preparation of Pd electroplating process | 第22页 |
| 1.8.2 Properties of Palladium plating | 第22-23页 |
| 1.8.3 Corrosion resistant properties of Pd plating | 第23页 |
| 1.9 Applications of Palladium and its alloys | 第23-24页 |
| 1.9.1 Automotive | 第23-24页 |
| 1.9.2 Hardware industry | 第24页 |
| 1.9.3 Biomedical | 第24页 |
| 1.10 Introduction to carbon steel | 第24页 |
| 1.11 Main significance of our study | 第24-27页 |
| CHAPTER 2: EXPERIMENTAL DETAIL | 第27-37页 |
| 2.1 Materials and Substrate | 第27页 |
| 2.1.1 Substrate | 第27页 |
| 2.1.2 Substrate pretreatment | 第27页 |
| 2.2 Electroplating | 第27-30页 |
| 2.2.1 Trivalent chromium electroplating | 第27-29页 |
| 2.2.2 Palladium electroplating | 第29-30页 |
| 2.3 Characterization of Cr-Pd films | 第30-31页 |
| 2.3.1 Microhardness test | 第30页 |
| 2.3.2 Adhesion test | 第30页 |
| 2.3.3 Scanning electron microscope (SEM) | 第30页 |
| 2.3.4 X-ray photoelectron spectroscopy (XPS) | 第30-31页 |
| 2.3.5 X-ray diffraction analysis (XRD) | 第31页 |
| 2.3.6 Contact angle | 第31页 |
| 2.3.7 Porosity test | 第31页 |
| 2.4 Corrosion performance test | 第31-33页 |
| 2.4.1 Potentiodynamic polarization test | 第31-32页 |
| 2.4.2 Electrochemical impedance spectroscopy | 第32-33页 |
| 2.5 Erosion corrosion test | 第33-37页 |
| CHAPTER 3:DEVELOPMENT OF CR-PD DOUBLE COATING & INFLUENCE OF DIFFERENT CURRENT DENSITIES | 第37-55页 |
| 3.1 Detail of preparation Cr-Pd double coating | 第37页 |
| 3.2 Appearance and morphology of Cr and Cr-Pd double coating | 第37-40页 |
| 3.2.1 Surface morphology Cr coating | 第37-38页 |
| 3.2.2 Surface morphologies on different current densities of Pd plating over Cr coating | 第38-40页 |
| 3.3 Cross sectional morphology of Cr Coating & Cr-Pd doubly coating | 第40页 |
| 3.4 Cross sectional EDX spectrum of Cr & Pd coating | 第40-41页 |
| 3.5 Influence of different current densities on contents of Cr-Pd double coating | 第41-43页 |
| 3.6 Influence of different current densities on grain size | 第43-45页 |
| 3.7 Influence of thickness on Cr-Pd double coating | 第45-46页 |
| 3.8 Effect of current densities on XPS spectra | 第46-48页 |
| 3.9 Effect of current densities on hardness of Cr & Cr-Pd double coating | 第48-49页 |
| 3.10 Influence of different current densities on adhesive strength of Cr & between the Cr-Pd double coating | 第49-50页 |
| 3.11 Effect of current densities on porosity of Cr-Pd double coating | 第50-51页 |
| 3.12 Influence of current densities on contact angle of Cr-Pd double coating | 第51-53页 |
| 3.13 Conclusion | 第53-55页 |
| CHAPTER 4: CORROSION RESISTANCE OF CR-PD DOUBLE COATING | 第55-73页 |
| 4.1 Introduction | 第55-56页 |
| 4.2 Effect of current densities on Corrosion resistance of Cr & Cr-Pd double coating in 20％ H_2SO_4 solution | 第56-60页 |
| 4.2.1. Potentiodynamic polarization test | 第56-58页 |
| 4.2.2. Corrosion resistance in 20% H_2SO_4+NaCl at 80℃ | 第58-59页 |
| 4.2.3 Corrosion resistance in 20%H_2SO_4+NaCl+500 rmp speed at 80℃ | 第59-60页 |
| 4.3 Electrochemical impedance spectroscopy (EIS) | 第60-65页 |
| 4.3.1 Electrochemical impedance spectroscopy in 20% H_2SO_4 | 第60-63页 |
| 4.3.2 Electrochemical impedance spectroscopy in 20%H_2SO_4+NaCl+500 rpm | 第63-64页 |
| 4.3.4 Weight loss test in 20%H_2SO_4 | 第64-65页 |
| 4.4 Corrosion resistance in 3.5% NaCl at 80 ℃ | 第65-70页 |
| 4.4.1 Potentiodynamic polarization scan | 第65-67页 |
| 4.4.2 Electrochemical impedance spectroscopy | 第67-69页 |
| 4.4.3 Weight loss test in 3.5% NaCl | 第69-70页 |
| 4.5 Conclusion | 第70-73页 |
| CHAPTER 5: EROSION CORROSION PROPERTIES OF CR-PD DOUBLE COATING & INFLUENCE OF DIFFERENT TIMES | 第73-91页 |
| 5.1 Introduction | 第73-74页 |
| 5.2 Erosion-corrosion test measurements | 第74-75页 |
| 5.3 Open circuit potential | 第75页 |
| 5.4 Potentiodynamic polarization test | 第75-77页 |
| 5.5 Electrochemical impedance spectroscopy | 第77-78页 |
| 5.6 Surface morphologies after tests | 第78-81页 |
| 5.7 Weight loss measurements | 第81-82页 |
| 5.8 Influence of different times | 第82-89页 |
| 5.8.1 Surface morphologies on different deposition times of Pd plating over Cr coating | 第83-84页 |
| 5.8.2 Effect of different times on XPS spectra | 第84-85页 |
| 5.8.3 Influence of different times on grain size | 第85-86页 |
| 5.8.4 Potentiodynamic polarization test | 第86-88页 |
| 5.8.5 Electrochemical impedance spectra | 第88-89页 |
| 5.9 Conclusion | 第89-91页 |
| CHAPTER 6: SUMMARY OF CURRENT STUDY | 第91-93页 |
| REFRENCES | 第93-101页 |
| ACKNOWLEDGEMENT | 第101-103页 |
| PUBLICATION | 第103-105页 |
| INTRODUCTION TO AUTHOR & SUPERVISOR | 第105-106页 |
| 附件 | 第106-107页 |
