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Vol.34, No.4, 535 ~ 540, 1996
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| Title |
| Research Paper - Environment - : A Study on the Oxidation Behavior of A356.2 Alloys |
| 김동희Dong Hee Kim, 임성철Sung Chul Lim, 김정식Jung Sik Kim, 이창희Chang Hee Lee, 윤의박Eui Pak Yoon |
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| Abstract |
| Experiments were performed by thermogravimetric(TG) technique for A356.2(Al-7Si-0.4Mg) aluminum alloy containing 0.4wt%Mg to examine the effect of magnesium on the oxidation kinetics in dry and moist air over the temperature range of 200∼550℃. The results of TG analysis showed that oxidation in moist air was much faster than in dry air at high temperatures above 525℃ while oxidation in both dry and moist air below 200℃ was stagnant. For the surface analysis of oxidation, the results of Auger electron spectroscopy(AES), X-ray diffraction patterns(XRD), analysis showed that only aluminum oxide was formed at relatively low temperature of 300℃ while the duplex film structure of Mg oxide/Al oxide/matrix was formed at high temperature of 550℃. MgO was a major constituent on the surface of oxide film, but the relative concentration of MgO decreased with increasing depth, while that of spinel, MgAl₂O₃ increased. |
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