Improvement of surface corrosion resistance for magnesium alloy by combining thermal spray and cast-infiltration  

作　　者：张忠礼 丁勇 王鑫 杨国强 沈威威 韩海玲 

机构地区：[1]School of Materials Science and Engineering, Shenyang University of Technology

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第6期992-996,共5页中国有色金属学报（英文版）

摘　　要：The present work focuses on a new method combining cast-infiltration with thermal spraying technology to improve the surface corrosion resistance of magnesium alloy.A zinc-based alloy layer was fabricated on the surface of AZ91D magnesium alloy. The microstructure of the layer was characterized by scanning electron microscopy equipped with an energy dispersive X-ray spectroscopy(EDS).The phase constituent of these alloys was identified by X-ray diffractometry(XRD).The analysis results reveal that a zinc-based alloy layer with a thickness of 700μm can form on the surface of AZ91 alloy matrix.The layer is composed of Mg7Zn3,MgZn and a small amount of α-Mg solid solution.The results indicate that the corrosion-resistance of the specimen with a zinc-based alloy layer is much better than that of the specimen without the layer after being immersed in 5%NaCl solution for 240 h, and the layer is more protective for the AZ91 alloy.The present work focuses on a new method combining cast-infiltration with thermal spraying technology to improve the surface corrosion resistance of magnesium alloy.A zinc-based alloy layer was fabricated on the surface of AZ91D magnesium alloy. The microstructure of the layer was characterized by scanning electron microscopy equipped with an energy dispersive X-ray spectroscopy（EDS）.The phase constituent of these alloys was identified by X-ray diffractometry（XRD）.The analysis results reveal that a zinc-based alloy layer with a thickness of 700μm can form on the surface of AZ91 alloy matrix.The layer is composed of Mg7Zn3,MgZn and a small amount of α-Mg solid solution.The results indicate that the corrosion-resistance of the specimen with a zinc-based alloy layer is much better than that of the specimen without the layer after being immersed in 5%NaCl solution for 240 h, and the layer is more protective for the AZ91 alloy.

关 键 词：arc spraying cast-infiltration magnesium alloy corrosion resistance 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG174.442[金属学及工艺—金属材料]