Effect of Precipitated Phases on Corrosion of Mg95.8Gd3Zn1Zr0.2 Alloy with Long-Period Stacking Ordered Structure

doi:10.1007/s40195-015-0359-9

Abstract

Abstract:

The microstructure of the precipitated phases of Mg_95.8Gd₃Zn₁Zr_0.2 alloys with long-period stacking ordered structure before and after heat treatment is discussed. The corrosion properties of the as-cast (F), solid-solution (T4) and aging-treated (T6) alloys in 1% NaCl solution are studied. The hydrogen evolution and electrochemical measurements display that the as-cast Mg_95.8Gd₃Zn₁Zr_0.2 alloy with the continuous network eutectic phase exhibits the greatest corrosion resistance, while T6 sample with some needle-like phases and the particle phases is the worst among the three alloys. It is proposed to be mainly related to the amount, composition, microstructure and distribution of the precipitated phases.

Key words: Mg-Gd-Zn, Corrosion properties, Long-period stacking ordered (LPSO), Microstructure

Xi-Mei Zong, Dan Wang, Wei Liu, Kai-Bo Nie, Chun-Xiang Xu, Jin-Shan Zhang. Effect of Precipitated Phases on Corrosion of Mg_95.8Gd₃Zn₁Zr_0.2 Alloy with Long-Period Stacking Ordered Structure[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(1): 32-38.

Figures/Tables 9

Fig. 1 SEM microstructure of Mg95.8Gd3Zn1Zr0.2 alloys: a F alloy, b T4 alloy, c T6 alloy

Fig. 2 XRD patterns of F, T4 and T6 Mg95.8Gd3Zn1Zr0.2 alloys

Fig. 3 EDS spectra for a needle-like phases, b particle phases

Fig. 4 Corrosion depths of F, T4 and T6 Mg95.8Gd3Zn1Zr0.2 alloys as a function of immersion time

Fig. 5 Corrosion rates of F, T4 and T6 Mg95.8Gd3Zn1Zr0.2 alloys as a function of immersion time

Fig. 6 Corrosion rates of F, T4 and T6 Mg95.8Gd3Zn1Zr0.2 alloys in 1% NaCl solution

Fig. 7 Polarization curves of F, T4 and T6 Mg95.8Gd3Zn1Zr0.2 alloys in 1% NaCl solution

Table 1 Fitting results of the polarization curves of F, T4 and T6 Mg95.8Gd3Zn1Zr0.2 alloys

Alloy	E_corr (V)	i_corr (A/m²)	β_a (V/dec)	β_c (V/dec)	R_p (Ω m²)
F alloy	-1.6656	0.427	0.19173	0.22081	0.1045
T4 alloy	-1.6802	0.569	0.13882	0.20799	0.0636
T6 alloy	-1.6853	0.763	0.14017	0.20492	0.0474

Fig. 8 SEM images of Mg95.8Gd3Zn1Zr0.2 alloys immersed in 1% NaCl solution for 24 h: a F alloy, b T4 alloy, c T6 alloy, d-f corresponding high magnification images of a-c, respectively

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Effect of Precipitated Phases on Corrosion of Mg_95.8Gd₃Zn₁Zr_0.2 Alloy with Long-Period Stacking Ordered Structure

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