Effect of Heat Treatment on the Corrosion Resistance of Cast Mg-7.3Al Alloy

被引：0
作者：
Jia, Suqiu [1 ]
Liu, Guojun [2 ]
Chen, Qishuang [3 ]
机构：
[1] Changchun Univ Technol, Key Lab Adv Struct Mat, Minist Educ, Changchun 130012, Peoples R China
[2] Jilin Univ, Minist Educ, Key Lab Automobile Mat, Changchun 130022, Peoples R China
[3] Changchun Steel Serv Ctr Co Ltd, TKAS, Changchun 130012, Peoples R China
来源：
ADVANCES IN SUPERALLOYS, PTS 1 AND 2 | 2011年 / 146-147卷
关键词：
magnesium alloy; heat treatment; corrosion resistance; BEHAVIOR;
D O I：
10.4028/www.scientific.net/AMR.146-147.585
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Mg-7.3Al magnesium alloys were investigated in the paper. The paper presents microstructural characterization of Mg-7.3Al alloy after casting and heat treatment. The casting temperature was 740 degrees C and heat treatment was performed at 420 degrees C for 24 h with aging at 180 degrees C for 8h, 16h,24h. The microstructure of the casting alloy consists of alpha-Mg phase matrix with a primary 13 phase (Mg17Al12) at grain boundaries. After solution treatment beta phases were soluted in alpha-Mg phase matrix. Aging treatment caused beta 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 of the others heat treatment in polarization curve tests and the samples with aging for 16h and 24h presents higher corrosion resistance than those with solution and aging for 8h in immersion tests. Solution treatment plays a main role for corrosion resistance of Mg-7.3Al magnesium alloy in short term corrosion, but more continuous beta phases in Mg-7.3Al alloy after ageing act as a barrier and play a main role in long term corrosion.
引用
收藏
页码：585 / +
页数：2
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