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Abstract 11

제1장 서론 13

제2장 이론적 배경 및 문헌 조사 17

2.1. 마그네슘 합금 17

2.1.1. 마그네슘 합금의 활용 17

2.1.2. 마그네슘 합금 특징 23

2.2. 화성 피막 30

2.3. sol-gel method 30

2.4. Electrochemical Impedance Spectroscopy 35

2.4.1. Introduction 35

2.4.2. Graphical Representations 40

2.5. Potentiodynamic polarization test 45

2.5.1. 전기화학 원리 및 측정 45

2.5.2. Tafel plots 46

제3장 실험 51

3.1. 원료 물질 51

3.2. Sol-gel coating액 제조 51

3.3. 화성 처리 액 제조 55

3.4. 시편 제조 및 피막 및 코팅 처리 55

3.5. 분석 57

제4장 결과 및 고찰 59

4.1. Sol-gel coating 정성 분석 59

4.1.1. FT-IR & attenuated total reflection 59

4.1.2. Nuclear magnetic resonance 61

4.2. 염수 침지 시킨 시편의 시간에 따른 부식 거동 63

4.2.1. Electrochemical impedance spectroscopy 63

4.2.2. Potentiodynamic polarization test 78

4.3. 염수 침지에 따른 표면의 변화 분석 82

4.3.1. X-ray measurements 82

4.3.2. Scanning electron microscopy 86

제5장 결론 89

참고문헌 91

List of Tables

Table 1. Standard oxidation-reduction potentials 15

Table 2. Magnesium alloys in common use 16

Table 3. World annual primary magnesium production capacity, 2011 17

Table 4. Proposed light duty vehicle, light duty truck, and medium duty... 19

Table 5. Proposed light duty vehicle, light duty truck, and medium duty... 19

Table 6. Typical mechanical properties for castings 20

Table 7. Typical mechanical properties of wrought products 21

Table 8. Temper designation for magnesium alloys 22

Table 9. Equal bending stiffness(EBS) of magnesium alloys compared to other... 25

Table 10. Hydrolytic and non-hydrolytic... 32

Table 11. Materials used in the study 53

Table 12. Calculated values of the electrical equivalent circuit... 66

Table 13. Calculated values of the electrical equivalent circuit... 70

Table 14. Calculated values of the electrical equivalent circuit... 74

Table 15. Potentiodynamic polarization parameters of MC specimens 79

Table 16. Potentiodynamic polarization parameters of MCS specimens 80

Table 17. Potentiodynamic polarization parameters of MS specimens 81

Table 18. Elemental composition of specimens by XRF 83

Table 19. XPS analysis results of different specimen substrates 85

List of Figures

Fig. 1. Shielding effectiveness of magnesium alloys compared to other... 26

Fig. 2. Overview of the sol-gel process with steps 32

Fig. 3. Mechanism of sol-gel reaction with catalysis 33

Fig. 4. Formation of rings and chains 34

Fig. 5. Vector representation of the impedance of (a) series and... 38

Fig. 6. Complex-plane representation of the impedance of an interface 38

Fig. 7. Vector representation of the impedance Z(ω) in the complex-plane 40

Fig. 8. A simulated complex-plane representation of the impedance vector... 43

Fig. 9. Comparison of (a) complex-plane impedance, (b) complex-plane... 44

Fig. 10. Excitation waveform for Tafel plot 48

Fig. 11. Experimentally measured Tafel plot 48

Fig. 12. Chemical structure of silane used in this study 52

Fig. 13. Synthesis of sol-gel coating solution process 54

Fig. 14. Preparation of specimens 56

Fig. 15. Schematic of specimens 56

Fig. 16. Electrochemical impedance spectroscopy... 58

Fig. 17. IR spectrum of sol-gel coating solution 60

Fig. 18. IR-ATR spectrum of sol-gel coating film 61

Fig. 19. Reaction between the silanol group and the epoxy group 61

Fig. 20. 29Si-NMR spectrum of sol solution(이미지참조) 62

Fig. 21. ¹H-NMR spectra of (a) initial mixing solution and (b) the reacted... 63

Fig. 22. Schematic diagram of sample's electrical equivalent... 65

Fig. 23. Bode plot of conversion coating on AZ31 magnesium alloy 66

Fig. 24. Comparison of MC resistor variation according to salt deeping... 67

Fig. 25. Physical model of conversion coating on magnesium alloy in... 67

Fig. 26. Electrical equivalent circuit and bode plot with phase angle of MC... 68

Fig. 27. Frequency marked on Nyquist plot of MC specimens 69

Fig. 28. Bode plot of conversion coating & sol-gel coating double layer... 70

Fig. 29. Comparison of MCS resistor variation according to salt deeping time 71

Fig. 30. Electrical equivalent circuit and bode plot with phase angle of MCS... 72

Fig. 31. Frequency marked on Nyquist plot of MCS specimens 73

Fig. 32. Bode plot of sol-gel coating on AZ31 magnesium alloy 74

Fig. 33. Comparison of MS resistor variation according to salt deeping... 75

Fig. 34. Electrical equivalent circuit and bode plot with phase angle of MS... 76

Fig. 35. Frequency marked on Nyquist plot of MS specimens 77

Fig. 36. Potentiodynamic polarization curve of MC specimens 79

Fig. 37. Potentiodynamic polarization curve of MCS specimens 80

Fig. 38. Potentiodynamic polarization curve of MS specimens 81

Fig. 39. XRD pattern of specimens 83

Fig. 40. XPS spectra of specimens 84

Fig. 41. SEM image of specimens. (Magnification of 1000x) 87

Fig. 42. SEM image of specimens. (Magnification of 3000x) 88

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