표제지
목차
Abstract 5
제1장 서론 17
제2장 이론적 배경 22
2.1. 알루미늄 합금의 특성 및 종류 22
2.1.1. 알루미늄 합금의 특성 22
2.1.2. 알루미늄 합금의 종류 22
2.1.3. 알루미늄 합금의 부식 특성 28
2.2. 전식과 방식 33
2.2.1. 패러데이 법칙(Faraday's Law) 33
2.2.2. 전식 34
2.2.3. 선박에서의 전식 35
2.2.4. 음극방식 35
2.3. 침식부식 43
2.3.1. 침식부식의 특성 43
2.3.2. 침식부식의 종류 45
2.3.3. 침식부식의 방지 53
제3장 시험편 및 실험방법 55
3.1. 시험편 55
3.2. 실험방법 57
3.2.1. 정전류 가속 부식 실험 57
3.2.2. 액적충격침식 실험 61
3.2.3. 액적충격침식-전기화학적 실험 68
제4장 실험 결과 및 고찰 70
4.1. 전식 특성 분석 70
4.1.1. 전류밀도 영향 70
4.1.2. 시간 영향 95
4.2. 액적충격침식부식 특성 분석 132
4.2.1. 액적충격침식 특성 분석 132
4.2.2. 액적충격침식부식 특성 분석 138
제5장 결론 166
5.1. 전식 특성 평가 166
5.2. 액적충격침식부식 특성 평가 166
5.3. 종합 특성 평가 167
참고문헌 168
Table 1.1. Comparison of FRP ship and aluminum alloys ship 18
Table 2.1.1. Classification of Al alloy by heat treatment and chemical... 24
Table 2.1.2. Classification of aluminum alloys by temper designation 25
Table 2.1.3. Standard electromotive force potentials (Reduction... 29
Table 2.2.1. Flow velocity as diagnostic tool for erosion-corrosion... 44
Table 3.1.1. Chemical compositions of aluminum alloys 56
Table 3.2.1. Chemical compositions and properties of seawater 59
Table 4.1.1. Comparison of average weight loss for after galvanostatic... 109
Table 4.1.2. Comparison of average weight loss for after galvanostatic... 122
Table 4.2.1. Result of anodic polarization experiment analysis for... 143
Table 4.2.2. Results of Tafel analysis for various Al alloy specimens 152
Fig. 1.1. Corrosion of ship 19
Fig. 1.2. Stray current corrosion of ship 21
Fig. 2.1.1. Pourbaix diagrams of aluminum 31
Fig. 2.1.2. Mechanism of pitting corrosion of aluminum 32
Fig. 2.2.1. Mechanism of stray current corrosion 36
Fig. 2.2.2. Mechanism of stray current corrosion for ship at shore 37
Fig. 2.2.3. Cathodic protection by impressed current density, Iapp for...(이미지참조) 39
Fig. 2.2.4. Principle of ICCP for corrosion protection of ship hull 42
Fig. 2.3.1. Photograph of erosion-corrosion with undercutting direction 46
Fig. 2.3.2. Schematic of turbulent eddy mechanism for downstream... 46
Fig. 2.3.3. Turbulent erosion-corrosion 47
Fig. 2.3.4. Impingement erosion-corrosion 50
Fig. 2.3.5. Illustration of the wave impact, water sheet creation, and... 52
Fig. 2.3.6. Cavitation erosion-corrosion 54
Fig. 3.2.1. Electrochemical experimental apparatus 58
Fig. 3.2.2. Potentio/Galvanostatic equipment and monitoring display for... 60
Fig. 3.2.3. Potentio/Galvanostatic equipment and monitoring display for... 62
Fig. 3.2.4. Precision scale for weight measurement 63
Fig. 3.2.5. Scanning electron microscope (SEM) apparatus 64
Fig. 3.2.6. 3D optical microscope apparatus for 3D image analysis 65
Fig. 3.2.7. Equipment of experiment for erosion studies 66
Fig. 3.2.8. Equipment of experiment for erosion-corrosion studies 69
Fig. 4.1.1. Comparison of average weight loss for aluminum alloys... 71
Fig. 4.1.2. Surface morphologies of aluminum alloys after galvanostatic... 74
Fig. 4.1.3. SEM images of surfac e morphologies for Al5083-H321 after... 77
Fig. 4.1.4. SEM images of surface morphologies for Al5052-O after... 79
Fig. 4.1.5. SEM images of surface morphologies for Al6061-T6 after... 82
Fig. 4.1.6. Comparison of SEM images for aluminum alloys after... 83
Fig. 4.1.7. 3D microscopic image analysis of aluminum alloys after... 87
Fig. 4.1.8. Comparison of max. damage depth for aluminum alloys... 89
Fig. 4.1.9. Potential variation of Al5083-H321 during galvanostatic... 91
Fig. 4.1.10. Potential variation of Al5052-O during galvanostatic... 92
Fig. 4.1.11. Potential variation of Al6061-T6 during galvanostatic... 93
Fig. 4.1.12. Comparison of potential variation for aluminum alloys after... 94
Fig. 4.1.13. Surface morphologies of aluminum alloys after... 96
Fig. 4.1.14. SEM images of surface morphologies for Al5083-H321... 97
Fig. 4.1.15. SEM images of surface morphologies for Al5052-O after... 99
Fig. 4.1.16. SEM images of surface morphologies for Al6061-T6 after... 100
Fig. 4.1.17. 3D microscopic image analysis of aluminum after... 104
Fig. 4.1.18. Potential variation during galvanostatic experiment at... 106
Fig. 4.1.19. Comparison of avera ge weight loss for aluminum alloys after... 107
Fig. 4.1.20. Surface morphologies of aluminum alloys after... 111
Fig. 4.1.21. Attachment of bubble on aluminum surface during... 112
Fig. 4.1.22. SEM images of surface morphologies for aluminum alloys... 113
Fig. 4.1.23. 3D microscopic image analysis of aluminum alloys after... 116
Fig. 4.1.24. Comparison of max. damage depth for aluminum alloys... 118
Fig. 4.1.25. Comparison of potential variation during galvanostatic... 119
Fig. 4.1.26. Comparison of avera ge weight loss for aluminum alloys after... 120
Fig. 4.1.27. Surface morphologies of aluminum alloys after... 123
Fig. 4.1.28. SEM images of surface morphologies for aluminum alloys... 124
Fig. 4.1.29. 3D microscopic image analysis of aluminum alloys after... 127
Fig. 4.1.30. Comparison of max. damage depth for aluminum alloys... 128
Fig. 4.1.31. Comparison of potential variation during galvanostatic... 130
Fig. 4.2.1. Surface morphologies of aluminum alloys after erosion... 133
Fig. 4.2.2. SEM images of surface morphologies for Al 5083-H321 after... 134
Fig. 4.2.3. SEM images of surface morphologies for Al 5052-O after... 136
Fig. 4.2.4. SEM images of surface morphologies for Al 6061-T6 after... 137
Fig. 4.2.5. Anodic polarization curves of Al5083-H321 during anodic... 139
Fig. 4.2.6. Anodic polarization curves of Al5052-O during anodic... 140
Fig. 4.2.7. Anodic polarization curves of Al6061-T6 during anodic... 142
Fig. 4.2.8. Polarization curve of Al5083-H321 for Tafel analysis 145
Fig. 4.2.9. Polarization curve of Al5052-O for Tafel analysis 148
Fig. 4.2.10. Polarization curve of Al6061-T6 for Tafel analysis 150
Fig. 4.2.11. Results of Tafel analysis for various Al alloy... 151
Fig. 4.2.12. Surface morphologies of aluminum alloys after anodic... 154
Fig. 4.2.13. SEM images of surface morphologies for aluminum alloys... 155
Fig. 4.2.14. SEM images of surface morphologies for aluminum alloys... 158
Fig. 4.2.15. 3D microscopic image analysis of Al5083-H321 after anodic... 159
Fig. 4.2.16. 3D microscopic image analysis of Al5052-O after anodic... 161
Fig. 4.2.17. 3D microscopic image analysis of Al6061-T6 after anodic... 162
Fig. 4.2.18. Comparison of max. damage depth for aluminum alloys after... 163