EFFECT OF La ON THE CORROSION RESISTANCE OF AZ91D MAGNESIUM ALLOY IN NaCl AQUEOUS SOLUTION

被引：0
作者：
Wu Guohua [1 ,2 ]
Fan Yu [1 ,3 ]
Zhai Chunquan [1 ]
Ding Wenjiang [1 ,2 ]
机构：
[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composite, Shanghai 200240, Peoples R China
[3] Guangzhou Res Inst Nanoferrous Met, Res Dept Wear Resistant Mat Engn Mach, Guangzhou 510650, Guangdong, Peoples R China
来源：
ACTA METALLURGICA SINICA | 2008年 / 44卷 / 10期
关键词：
Mg alloy AZ91D; microstructure; La; corrosion morphology; corrosion product;
D O I：
暂无
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The microstructure, corrosion morphology and corrosion product of AZ91D and AZ91D-1.0La alloys were investigated. With the addition of 1%La (mass fraction) in AZ91D, not only rod-like Al11La3 and blocky Al8LaMn4 phases, but also much fine laminar beta phase (Mg17Al12) around bulk beta phase formed. The fine laminar beta phase obviously restrained the further development of corrosion, which greatly improved the corrosion resistance of AZ91D. Al11La3 phase is cathodic phase, but this phase did not accelerate corrosion of alpha-Mg matrix because rod-like Al11La3 only offers a small cathodic area. However, blocky Al8LaMn4 phase obviously accelerated corrosion of alpha-Mg matrix because of its large cathodic area.
引用
收藏
页码：1247 / 1252
页数：6
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