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http://dx.doi.org/10.5695/JKISE.2015.48.5.227

Corrosion analysis of the duplex aluminum alloys  

Choi, In Kyu (School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education)
Kim, Si Myeong (School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education)
Kim, Sang Ho (School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education)
Publication Information
Journal of the Korean institute of surface engineering / v.48, no.5, 2015 , pp. 227-232 More about this Journal
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 $16.29{\mu}A/cm^2$, and that of the high solute alloy was high as $84.92{\mu}A/cm^2$. The difference was mainly attributed to the inter-granular precipitates $Mg_2Si$ 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.
Keywords
corrosion analysis; Al-Mg-Sl alloy; anodic polarization; polarization resistance; $Mg_2Si$; Si;
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Times Cited By KSCI : 1  (Citation Analysis)
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