표제지
목차
Abstract 7
제1장 서론 17
제2장 이론적 배경 19
2.1. 알루미늄 합금의 종류 및 특성 19
2.1.1. 물리적 특성 19
2.1.2. 합금의 분류 20
2.1.3. 주조 합금 23
2.1.4. 선박용 알루미늄 합금의 종류와 그 특성 25
2.2. 알루미늄 합금의 부식 27
2.2.1. 알루미늄의 부식 특성 27
2.2.2. 알루미늄의 부식에 영향을 미치는 인자 30
2.2.3. 알루미늄의 부식 손상 32
2.2.4. 알루미늄의 내식성에 미치는 합금원소의 영향 36
2.3. 분극 및 전기화학적 측정법 38
2.3.1. 분극의 종류 38
2.3.2. 전기화학적 부식속도 측정법 42
2.4. 캐비테이션 침식 45
2.4.1. 캐비테이션에로전의 정의 45
2.4.2. 기포의 생성 및 붕괴과정 45
2.4.3. 캐비테이션에 의한 손상전개과정 46
2.4.4. 워터 터널법과 대향형 진동 시험법에서의 손상거동 50
제3장 시험편 및 실험방법 53
3.1. 시험편 53
3.2. 실험방법 55
3.2.1. 전기화학적 특성 평가 실험방법 55
3.2.2. 캐비테이션 특성 평가 실험방법 60
제4장 실험 결과 및 고찰 65
4.1. 전기화학적 특성 평가 65
소결론 92
4.2. 캐비테이션 특성 평가 94
4.2.1. 진폭 5 ㎛에 따른 캐비테이션 손상 특성 94
4.2.2. 진폭 10 ㎛에 따른 캐비테이션 손상 특성 121
4.2.3. 진폭 30 ㎛에 따른 캐비테이션 손상 특성 147
4.2.4. 진폭변수에 따른 캐비테이션 손상 특성 174
소결론 183
제5장 결론 184
참고문헌 187
Table 2.1. Classification of Al alloy by heat treatment and chemical... 21
Table 2.2. Classification of Al alloy by temper designation 24
Table 2.3. The main classification societies standard aluminum alloys... 26
Table 2.4. Standard electromotive force potentials 28
Table 3.1. Chemical compositions of aluminum alloys 54
Table 3.2. Chemical compositions and properties of seawater 59
Table 4.1. Results of cyclic polarization experiments analysis of aluminium... 79
Table 4.2. Results of Tafel analysis of aluminium alloys in sea water 91
Fig. 2.1. Aluminum alloy designation system 22
Fig. 2.2. Pourbaix diagrams of aluminum 29
Fig. 2.3. Effect of pH on corrosion rate of aluminum 31
Fig. 2.4. Schematic illustration of localised corrosion on aluminum alloys 33
Fig. 2.5. Mechanism of pitting corrosion of aluminum 35
Fig. 2.6. Schematic of concentration polarization curve 40
Fig. 2.7. Schematic of combined polarization curve 41
Fig. 2.8. Schematic of polarization curves explained by Tafel's... 43
Fig. 2.9. Collapse process of cavitation bubbles near by solid surface 47
Fig. 2.10. Formation and collapse process of cavitation bubbles 48
Fig. 2.11. Modeling of R-t curve by cavitation erosion 49
Fig. 2.12. Comparison of damage rate for various materials in direct form... 51
Fig. 3.2.1. Electrochemical experiment equipment and monitoring display... 56
Fig. 3.2.2. Electrochemical experimental apparatus 57
Fig. 3.2.3. Electrochemical experiment electrode apparatus 58
Fig. 3.2.4. Scanning electron microscope (SEM) apparatus 61
Fig. 3.2.5. 3D image analysis display(left), 3D optical microscope(right)... 62
Fig. 3.2.6. Cavitation tester apparatus 63
Fig. 4.1.1. Anodic polarization curve of aluminum alloys in sea water 66
Fig. 4.1.2. Surface morphologies of aluminum alloys after anodic... 67
Fig. 4.1.3. Result of calculating corroded area after anodic polarization... 69
Fig. 4.1.4. 3D analysis of aluminum alloys surface after anodic... 71
Fig. 4.1.5. Surface morphologies of 5052-O after anodic polarization... 72
Fig. 4.1.6. Surface morphologies of 5083-H321 after anodic polarization... 73
Fig. 4.1.7. Surface morphologies of 6061-T6 after anodic polarization... 74
Fig. 4.1.8. Cyclic polarization curve of aluminium alloys in sea water 77
Fig. 4.1.9. Cathodic polarization curve of aluminum alloys in sea water 80
Fig. 4.1.10. Surface morphologies of aluminum alloys after cathodic... 83
Fig. 4.1.11. Surface morphologies after cathodic polarization experiment... 84
Fig. 4.1.12. Surface morphologies after cathodic polarization experiment... 85
Fig. 4.1.13. Surface morphologies after cathodic polarization experiment... 86
Fig. 4.1.14. 3D analysis of aluminum alloys surface after cathodic... 88
Fig. 4.1.15. Results of Tafel analysis of aluminium alloys in sea water 90
Fig. 4.2.1. Surface morphologies after 5㎛ cavitation experiment of... 95
Fig. 4.2.2. 3D analysis and surface damage depth after 5㎛ cavitation... 97
Fig. 4.2.3. Surface morphologies after 5㎛ cavitation experiment of... 98
Fig. 4.2.4. Weight loss and Weight loss rate after 5㎛ cavitation... 100
Fig. 4.2.5. Surface morphologies after 5㎛ cavitation experiment of... 102
Fig. 4.2.6. 3D analysis and surface damage depth after 5㎛ cavitation... 104
Fig. 4.2.7. Surface morphologies after 5㎛ cavitation experiment of... 105
Fig. 4.2.8. Weight loss and Weight loss rate after 5㎛ cavitation... 107
Fig. 4.2.9. Surface morphologies after 5㎛ cavitation experiment of... 108
Fig. 4.2.10. 3D analysis and surface damage depth after 5㎛ cavitation... 111
Fig. 4.2.11. Surface morphologies after 5㎛ cavitation experiment of... 112
Fig. 4.2.12. Weight loss and weight loss rate after 5㎛ cavitation... 113
Fig. 4.2.13. Surface morphologies after 5㎛ cavitation experiment of... 115
Fig. 4.2.14. 3D surface damage depth after 5㎛ cavitation experiment of... 116
Fig. 4.2.15. Surface morphologies after 5㎛ cavitation experiment of... 118
Fig. 4.2.16. Weight loss and Weight loss rate after 5㎛ cavitation... 119
Fig. 4.2.17. Surface morphologies after 10㎛ cavitation experiment of... 122
Fig. 4.2.18. 3D analysis and surface damage depth after 10㎛ cavitation... 124
Fig. 4.2.19. Surface morphologies after 10㎛ cavitation experiment of... 125
Fig. 4.2.20. Weight loss and Weight loss rate after 10㎛ cavitation... 127
Fig. 4.2.21. Surface morphologies after 10㎛ cavitation experiment of... 128
Fig. 4.2.22. 3D analysis and surface damage depth after 5㎛ cavitation... 130
Fig. 4.2.23. Surface morphologies after 10㎛ cavitation experiment of... 132
Fig. 4.2.24. Weight loss and Weight loss rate after 10㎛ cavitation... 133
Fig. 4.2.25. Surface morphologies after 10㎛ cavitation experiment of... 135
Fig. 4.2.26. 3D analysis and surface damage depth after 10㎛ cavitation... 137
Fig. 4.2.27. Surface morphologies after 10㎛ cavitation experiment of... 138
Fig. 4.2.28. Weight loss and Weight loss rate after 10㎛ cavitation... 140
Fig. 4.2.29. Surface morphologies after 10㎛ cavitation experiment of... 141
Fig. 4.2.30. 3D Surface damage depth after 10㎛ cavitation experiment of... 143
Fig. 4.2.31. Surface morphologies after 10㎛ cavitation experiment of... 144
Fig. 4.2.32. Weight loss and Weight loss rate after 10㎛ cavitation... 145
Fig. 4.2.33. Surface morphologies after 30㎛ cavitation experiment of... 148
Fig. 4.2.34. 3D analysis and surface damage depth after 30㎛ cavitation... 150
Fig. 4.2.35. Surface morphologies after 30㎛ cavitation experiment of... 152
Fig. 4.2.36. Weight loss and Weight loss rate after 30㎛ cavitation... 153
Fig. 4.2.37. Surface morphologies after 30㎛ cavitation experiment of... 155
Fig. 4.2.38. 3D analysis and surface damage depth after 30㎛ cavitation... 157
Fig. 4.2.39. Surface morphologies after 30㎛ cavitation experiment of... 159
Fig. 4.2.40. Weight loss and weight loss rate after 30㎛ cavitation... 160
Fig. 4.2.41. Surface morphologies after 30㎛ cavitation experiment of... 161
Fig. 4.2.42. 3D analysis and surface damage depth after 30㎛ cavitation... 164
Fig. 4.2.43. Surface morphologies after 30㎛ cavitation experiment of... 165
Fig. 4.2.44. Weight loss and weight loss rate after 30㎛ cavitation... 167
Fig. 4.2.45. Surface morphologies after 30㎛ cavitation experiment of... 168
Fig. 4.2.46. 3D Surface damage depth after 30㎛ cavitation experiment of... 169
Fig. 4.2.47. Surface morphologies after 30㎛ cavitation experiment of... 171
Fig. 4.2.48. Weight loss and weight loss rate after 30㎛ cavitation... 172
Fig. 4.2.49. Comparison of micro-Vickers hardness of aluminum alloys 175
Fig. 4.2.50. Surface morphologies after 5㎛, 10㎛, 30㎛ cavitation... 176
Fig. 4.2.51. Surface morphologies after 5㎛, 10㎛, 30㎛ cavitation... 177
Fig. 4.2.52. Weight loss and surface damage depth after 5㎛, 10㎛, 30㎛... 179
Fig. 4.2.53. Weight loss after 5㎛, 10㎛, 30㎛ cavitation experiment of... 181
Fig. 4.2.54. Weight loss rate after 5㎛, 10㎛, 30㎛ cavitation experiment... 182