듀플렉스 알루미늄 합금의 내식성 분석
Corrosion analysis of the duplex aluminum alloys
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Corrosion characteristic of the duplex Al-Mg-Si alloys with low, commercial and high solute contents were studied using an anodic polarization test in 1M NaCl solution at room temperature. Polarization range condition of the experiment were form −0.3V to −1.3V with a 0.2 mV scanning speed. The exchange current density means corrosion rate of the low solute alloy was low as about 16.29 μA/cm2, and that of the high solute alloy was high as 84.92 μA/cm2. The difference was mainly attributed to the inter-granular precipitates Mg2Si and Si which could make a galvanic corrosion on the aluminum base. The amount of precipitates was greater in high solute alloy at mainly in grain boundary. While, the extruded alloys had better corrosion resistance than the cast alloy because the silicon precipitates become coarse during the extrusion process.
Abstract
Corrosion characteristic of the duplex Al-Mg-Si alloys with low, commercial and high solute contents were studied using an anodic polarization test in 1M NaCl solution at room temperature. Polarization range condition of the experiment were form −0.3V to −1.3V with a 0.2 mV scanning speed. The exchange current density means corrosion rate of the low solute alloy was low as about 16.29 μA/cm2, and that of the high solute alloy was high as 84.92 μA/cm2. The difference was mainly attributed to the inter-granular precipitates Mg2Si and Si which could make a galvanic corrosion on the aluminum base. The amount of precipitates was greater in high solute alloy at mainly in grain boundary. While, the extruded alloys had better corrosion resistance than the cast alloy because the silicon precipitates become coarse during the extrusion process.
참고문헌 (11)
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