Developing an empirical relationship to predict the corrosion rate of friction stir welded AZ61A magnesium alloy under salt fog environment

被引:38
作者
Dhanapal, A. [1 ]
Boopathy, S. Rajendra [2 ]
Balasubramanian, V. [3 ]
机构
[1] Sri Ramanujar Engn Coll, Dept Mech Engn, Madras 600048, Tamil Nadu, India
[2] Anna Univ, Coll Engn, Dept Mech Engn, Madras 600025, Tamil Nadu, India
[3] Annamalai Univ, Dept Mfg Engn, Ctr Mat Joining & Res CEMAJOR, Chidambaram 608002, Tamil Nadu, India
关键词
CHLORIDE-ION CONCENTRATION;
D O I
10.1016/j.matdes.2011.06.038
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Magnesium (Mg) alloys shows the lowest density among other engineering metallic materials. As a consequence, this light alloy has a promising future. However, these alloys have great affinity for oxygen and other chemical oxidizing agents. The limitation of low corrosion resistance restricts their practical applications. Extruded Mg alloy plates of 6 mm thick of AZ61A grade were butt welded using friction stir welding (FSW) process. Corrosion behavior of the welds was evaluated by conducting salt fog test in NaCl solution at different chloride ion concentrations, pH value and spraying time. Also an attempt was made to develop an empirical relationship to predict the corrosion rate of friction stir welded AZ61A magnesium alloy. Three factors and a central composite design were used to minimize the number of experimental conditions. Response surface method was used to develop their relationship. The developed relationship can be effectively used to predict the corrosion rate of friction stir weld AZ61A magnesium alloy at 95% confidence level. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:5066 / 5072
页数:7
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