Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 24    No. 12    December 2014

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Microstructure and biocorrosion behaviors of solution treated and as-extruded Mg-2.2Nd-xSr-0.3Zr alloys
Xiao-bo ZHANG1,2, Zhi-xin BA1,2, Zhang-zhong WANG1,2, Ya-jun XUE1,2, Qiang WANG3

1. College of Materials Engineering, Nanjing Institute of Technology, Nanjing 211167, China;
2. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, China;
3. Jiangsu Konsung Equipment Co., Ltd, Danyang 212300, China

Abstract:Mg-2.2Nd-xSr-0.3Zr alloys (x=0, 0.4 and 0.7, mass fraction, %) were prepared by gravity casting. Solution treatment was conducted on the as-cast alloys to homogenize microstructure, and hot extrusion was subsequently conducted. Microstructure was observed using an optical microscope and a scanning electron microscope. Biocorrosion behaviors of the alloy in simulated body fluid were analyzed by mass loss, hydrogen evolution and Tafel polarization experiments. The results show that the amount of residual eutectic phase of the solution treated alloys increases with increasing Sr addition, and the grains are significantly refined after hot extrusion. The corrosion resistance of the solution treated alloys deteriorates apparently with increasing Sr addition, while the corrosion resistance of the as-extruded alloys is improved with Sr addition. Nevertheless, the biocorrosion behavior of the as-extruded alloys obtained by Tafel polarization shows different trends from those obtained by the other two methods.

 

Key words: magnesium alloy; strontium; microstructure; biocorrosion behaviors

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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