| Title |
Research Paper - Environment - : A Study on the Oxidation Behavior of A356.2 Alloys |
| Authors |
김동희(Dong Hee Kim); 임성철(Sung Chul Lim); 김정식(Jung Sik Kim); 이창희(Chang Hee Lee); 윤의박(Eui Pak Yoon) |
| 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. |