The Role of Mg17Al12 Phase in the Corrosion of Mg Alloy AZ91

被引：0
|
作者：
Lunder, O. [1 ,2 ]
Lein, J. E. [1 ,2 ]
Aune, T. Kr. [3 ]
Nisancioglu, K. [4 ]
机构：
[1] SINTEF, Div Met, N-7034 Trondheim, Norway
[2] SINTEF, Corros Ctr, N-7034 Trondheim, Norway
[3] Norsk Hydro AS, N-3901 Porsgrunn, Norway
[4] Norwegian Inst Technol, Labs Ind Electrochem, Dept Chem, N-7034 Trondheim, Norway
来源：
CORROSION | 2019年 / 75卷 / 09期
关键词：
MAGNESIUM; BEHAVIOR;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Corrosion behavior of mold-cast Mg alloy AZ91 is investigated in as-cast (F), homogenized (T4), and artificially-aged (T6) conditions in chloride media. Heat treatment influences mainly the distribution of intermetallic beta-phase (Mg17Al12) in the alloy. Aging to T6 temper causes precipitation of the phase as a nearly continuous network of secondary particles along the grain boundaries. The alloy exhibits much better corrosion resistance in the T6 temper than it does in the other two conditions. It is observed that the beta-phase is inert to the chloride solution in comparison to the magnesium matrix and acts as a corrosion barrier. The mechanism responsible for this behavior is investigated by studying the electrochemical properties of synthetically prepared beta-phase and solid-solution alloys representative of the magnesium matrix.
引用
收藏
页码：1018 / 1025
页数：8
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