해양환경에서 Al-Mg-Si 알루미늄 합금의 부식 및캐비테이션 -침식 저항성에 미치는 양극산화시간의 영향
Effect of Anodizing Time on the Corrosion and Cavitation–Erosion Resistance of Al-Mg-Si Aluminum Alloy in Marine Environments
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In this investigation, anodizing of aluminum alloy was conducted at a current density of 20 mA/cm in a 10 vol.% sulfuric acid solution at 10 oC for durations of 10, 20, and 40 minutes. The electrochemical char- acteristics and cavitation-erosion behavior of the anodized specimens in natural seawater were examined in relation to anodizing time. In a static seawater environment, results from the potentiodynamic polarization experiments indicated that the corrosion current density decreased with longer anodizing times. This improvement in corrosion resistance is attributed to the increasing thickness of the oxide film, which slows or blocks the rate at which chloride ions—corrosive agents in seawater—reach the base material. The cav- itation-erosion experiment revealed that the maximum damage depth of the specimen anodized for 10 min- utes was reduced by 63.903 m compared to the uncoated base material. However, while the thickness of the oxide film increased for the specimen anodized for 40 minutes, its higher brittleness diminished the toughness necessary to prevent crack formation and propagation, ultimately weakening its resistance to cavitation and erosion.
Abstract
In this investigation, anodizing of aluminum alloy was conducted at a current density of 20 mA/cm in a 10 vol.% sulfuric acid solution at 10 oC for durations of 10, 20, and 40 minutes. The electrochemical char- acteristics and cavitation-erosion behavior of the anodized specimens in natural seawater were examined in relation to anodizing time. In a static seawater environment, results from the potentiodynamic polarization experiments indicated that the corrosion current density decreased with longer anodizing times. This improvement in corrosion resistance is attributed to the increasing thickness of the oxide film, which slows or blocks the rate at which chloride ions—corrosive agents in seawater—reach the base material. The cav- itation-erosion experiment revealed that the maximum damage depth of the specimen anodized for 10 min- utes was reduced by 63.903 m compared to the uncoated base material. However, while the thickness of the oxide film increased for the specimen anodized for 40 minutes, its higher brittleness diminished the toughness necessary to prevent crack formation and propagation, ultimately weakening its resistance to cavitation and erosion.