Influence of heat treatment and microstructure on the corrosion of magnesium alloy Mg-10Gd-3Y-0.4Zr

被引：68
作者：
Peng, Li-Ming [2 ]
Chang, Jian-Wei [1 ,2 ]
Guo, Xing-Wu [2 ]
Atrens, Andrej [3 ]
Ding, Wen-Jiang [2 ]
Peng, Ying-Hong [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mech Engn, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloys Net Forming LAF, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[3] Univ Queensland, Div Mat, Sch Engn, Brisbane, Qld 4072, Australia
来源：
JOURNAL OF APPLIED ELECTROCHEMISTRY | 2009年 / 39卷 / 06期
关键词：
Corrosion; Heat treatment; Mg-Gd-Y-Zr alloy; Microstructure; Potentiodynamic polarization curve; ELECTROCHEMICAL-BEHAVIOR; GALVANIC CORROSION; WT.PERCENT ALLOY; RARE-EARTH; AZ91D; PRECIPITATION; ZE41; PERFORMANCE; CRACKING; ND;
D O I：
10.1007/s10800-008-9739-4
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The corrosion of Mg alloy Mg-10Gd-3Y-0.4Zr, in the as-cast (F), solution treated (T4) and aged (T6) conditions, was investigated in 5% NaCl solution by immersion tests and potentiodynamic polarization measurements. The as-cast (F) condition had the highest corrosion rate due to micro-galvanic corrosion of the alpha-Mg matrix by the eutectic. Solution treatment led to the lowest corrosion rate, attributed to the absence of any second phase and a relatively compact protective surface film. Ageing at 250 A degrees C increased the corrosion rate with increasing ageing time to 193 h attributed to increasing micro-galvanic corrosion acceleration of the Mg matrix by increasing amounts of the precipitates. Ageing for longer periods caused a decrease in the corrosion rate attributed to some barrier effect by a nearly continuous second-phase network. Electrochemical measurements did not give accurate evaluation of the corrosion rate in agreement with the immersion tests.
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页码：913 / 920
页数：8
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