소형선박 프로펠러용 6000계열 알루미늄 합금의 양극산화시간에 따른 캐비테이션 -침식과 부식의 복합거동
Synergistic Behavior on Cavitation–Erosion and Corrosion of Anodized 6000 Series Aluminum Alloy for Small Ship Propellers
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Al-Mg-Si aluminum alloys used in small ship propellers are subjected to a challenging environment where cavitation-erosion and corrosion occur simultaneously in seawater. This study explored anodized aluminum alloy as an alternative technology. We conducted indentation tests and a hybrid experiment combining electrochemical and cavitation-erosion assessments. The indentation results showed that anodized specimens treated for 10, 20 and 40 minutes had significant hardness increases of 208.282, 336.74 and 369.276 Hv, respectively, compared to the base material's hardness of 94.9 Hv, with a notable suppression of creep behavior. In the hybrid experiment, the anodized specimen treated for 10 minutes demonstrated a current density increase, delaying in the range of -0.8775 V to -0.7966 V, and exhibited the lowest corrosion current density of 2.55 μA/cm . Following this experiment, the anodized speciment treated for 10 minutes also showed the lowest weight loss (40.9 mg), surface roughness (14.4 μm) and maximum dam- age depth (93.8 μm). Conversely, the specimen anodized for 40 minutes exhibited higher hardness than the 10-minute specimen, but showed an increased tendency for cracks and damage due to reduced toughness.
Abstract
Al-Mg-Si aluminum alloys used in small ship propellers are subjected to a challenging environment where cavitation-erosion and corrosion occur simultaneously in seawater. This study explored anodized aluminum alloy as an alternative technology. We conducted indentation tests and a hybrid experiment combining electrochemical and cavitation-erosion assessments. The indentation results showed that anodized specimens treated for 10, 20 and 40 minutes had significant hardness increases of 208.282, 336.74 and 369.276 Hv, respectively, compared to the base material's hardness of 94.9 Hv, with a notable suppression of creep behavior. In the hybrid experiment, the anodized specimen treated for 10 minutes demonstrated a current density increase, delaying in the range of -0.8775 V to -0.7966 V, and exhibited the lowest corrosion current density of 2.55 μA/cm . Following this experiment, the anodized speciment treated for 10 minutes also showed the lowest weight loss (40.9 mg), surface roughness (14.4 μm) and maximum dam- age depth (93.8 μm). Conversely, the specimen anodized for 40 minutes exhibited higher hardness than the 10-minute specimen, but showed an increased tendency for cracks and damage due to reduced toughness.