발간논문

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Vol.38, No.9, 1263 ~ 1269, 2000
Title
Effects of Grain Size on Corrosion Behavior of AZ91D Magnesium Alloy in Salt Spray Atmosphere
이충도Choong Do Lee,강춘식Choon Sik Kang,신광선Kwang Sun Shin
Abstract
The corrosion behaviors with grain refinement were investigated on the AZ91D magnesium alloy. The grain size was controlled by the inoculation and the change of pouring temperature, the use of cone-type permanent mold. The salt spray test was conducted for 480 hours following ASTM B 117 specification. And the corroded surface and corrosion products were analyzed by SEM and XRD, respectively. Both the corrosion rate and the corrosion depth were markedly decreased by the fine distribution of second phase due to the grain refinement. The relationship between corrosion rate and grain size in the present study could be well predicted the corrosion rate of as-cast AZ91D alloy that have a range of grain size in commercial castings. The corrosion products were consisted of Mg(OH) ₂ and chlorides mainly.
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