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| Microstructure of Mg-5Gd-3Y-0.8Zr alloy and its corrosion resistance in NaCl solution |
| YANG Jing-jing1，TANG Xian-sheng2，XIE Jiang-huai1，MO Yu-mei1 |
（1. Industrial Automation Department， Guangdong Polytechnic College， Zhaoqing 526100， China
2. Sprocket Photoelectric Equipment Co.， Ltd.， Zhaoqing 526100， China） |
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Abstract The microstructure and corrosion resistance of Mg-5Gd-3Y-0.8Zr alloys were studied systemically. The corrosion rate of the alloy in NaCl solution was measured by static weight loss test. The results show that the as cast alloy is mainly composed of α-Mg matrix and cubic β phase （Mg5Gd， Mg24Y5）. After aging treatment， the amount of β phase is obviously increased and mainly distributed in the grain boundary. The corrosion rate of magnesium alloy increases obviously after 12 h swamped in NaCl solution. After corrosion for 24 h in the 3.5%NaCl （mass percent） solution， the magnesium alloy has been seriously corroded， and the alloy surface is covered with corrosion pits and white corrosion products which have not fallen off. Magnesium alloy is prone to intergranular corrosion， and the cubic β phase particles can effectively prevent the surface corrosion extending to the alloy inside from the grain boundaries， thus improving the corrosion resistance of the magnesium alloy.
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Received: 02 June 2016
Published: 14 November 2017
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2017, Vol. 27 
