Effect of Heat Treatment on Corrosion Resistance of Cast Magnesium Alloy Mg-7.3Al
Mg-7.3Al magnesium alloy was investigated in the paper. The paper presents microstructure characterization of Mg-7.3Al alloy after casting and heat treatment. The casting temperature was 740℃ and heat treatment was performed at 420 ℃ for 24 h with aging at 180 ℃ for 8h, 16h, 24h. The microstructure of the casting alloy consists of α-Mg phase matrix with a primary β phase (Mg17Al12) at grain boundaries. After solution treatment p phases were soluted in α-Mg phase matrix. Aging treatment caused p phases precipitation. The corrosion resistance of magnesium alloy was determined in 3.5％ NaCl by immersion tests and polarization curves. The results shows that the corrosion resistance of magnesium alloy after solution treat is the best than that the others heat treatment in polarization curve tests and aging for 16h and 24h presents higher corrosion resistance than the solution and aging for 8h in immersion tests In short term corrosion solution treatment plays a main role but in long term corrosion, more continuous β phases in mg-7.3Al alloy act as a barrier and play a main role.
magnesium alloy heat treatment corrosion resistance
JIA Su-qiu LIU Guo-jun YU Shu-min
Key Laboratory of Advanced Structrural Materials,Ministry of Education,Changchun University of Techn Key Laboratory of Automobile Materials,Ministry of Education,Jilin University(Nanling Campus),Changc
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
139-142
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）