Effect of Zn Addition on Microstructure and Corrosion Property of As-extruded Mg-13Gd-2Cu Alloy

doi:10.11902/1005.4537.2016.181

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (6): 595-603 DOI: 10.11902/1005.4537.2016.181

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Effect of Zn Addition on Microstructure and Corrosion Property of As-extruded Mg-13Gd-2Cu Alloy

Zhenwei GENG,Daihong XIAO(

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State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

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Abstract

The effect of Zinc addition on microstructure and corrosion property of the as-extruded Mg-13Gd-2Cu alloy were studied using scanning electron microscope (SEM) equipped with energy dispersive spectroscope (EDS), electron microprobe analysis (EMPA), X-ray diffractometer, immersion test and electrochemical measurements. The result show that the Mg-13Gd-2Cu alloy consists mainly of α-Mg, Mg₅(GdCu)₁ and elemental Gd phase. When 2%(mass fraction) Zn added in the Mg-13Gd-2Cu alloy, a long period stacking order (LPSO) phase Mg₁₂(GdCuZn)₁ forms. The presence of the LPSO phase enables the corrosion rate of the alloy to be decreased from 1.51 mm/d to 1.23 mm/d. The results of electrochemical measurements with various scan rate indicate that the free-corrosion potential (E_corr) shifts positively and the free-corrosion current density (I_corr) decreases about 0.18 mAcm^-2 for the Mg-13Gd-2Cu-2Zn alloy. The reduction of I_corr proves that Zn addition can enhance the corrosion resistance of Mg-13Gd-2Cu alloy.

Key words: rare magnesium alloy adding Zn microstructure LPSO phase corrosion property

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Zhenwei GENG,Daihong XIAO. Effect of Zn Addition on Microstructure and Corrosion Property of As-extruded Mg-13Gd-2Cu Alloy. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 595-603.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.181 OR https://www.jcscp.org/EN/Y2016/V36/I6/595

Fig.1 SEM images of as-cast Mg-13Gd-2Cu (a) and Mg-13Gd-2Cu-2Zn (b) alloys

Table 1 Chemical composition analysises of different phases in two as-cast alloys by EPMA (atomic fraction / %)

Fig.2 XRD patterns of the as-cast Mg-13Gd-2Cu and Mg-13Gd-2Cu-2Zn alloys

Fig.3 EMPA surface mappings of main elements of as-cast Mg-13Gd-2Cu (a) and Mg-13Gd-2Cu-2Zn (b) alloys

Fig.4 Low magnification BS-SEM images of Mg-13Gd-2Cu (a) and Mg-13Gd-2Cu-2Zn (b) along the extrusion direction, Mg-13Gd-2Cu (c) and Mg-13Gd-2Cu-2Zn (d) perpendicular to the extrusion direction

Fig.5 High magnification BS-SEM images of Mg-13Gd-2Cu (a) and Mg-13Gd-2Cu-2Zn (b) along the extrusion direction, Mg-13Gd-2Cu (c) and Mg-13Gd-2Cu-2Zn (d) perpendicular to the extrusion direction

Fig.6 SEM images of two as-extruded alloys after single face immersion for 24 h: (a, c) Mg-13Gd-2Cu, (b, d) Mg-13Gd-2Cu-2Zn

Fig.7 Tafel curves of two as-extruded alloys under different scanning rates: (a) 5 mV/s; (b) 2 mV/s; (c) 1 mV/s; (d)0.5 mV/s

Table 2 Fitting values of various parameters based on Tafel curves in Fig.7

Fig.8 BS-SEM images of as-extruded Mg-13Gd-2Cu (a) and Mg-13Gd-2Cu-2Zn (b) alloys after electrochemical measurements under 1mV/s scanning rate

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