Effect of (Gd, Y) Containing-phases on Local Corrosion of Aged GW103K Alloy

doi:10.11901/1005.3093.2018.483

Chinese Journal of Materials Research

2019, Vol. 33

Issue (3): 199-208 DOI: 10.11901/1005.3093.2018.483

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Effect of (Gd, Y) Containing-phases on Local Corrosion of Aged GW103K Alloy

Shuang YU^1,²,Ruiling JIA¹(

),Han ZHANG^1,²,Wei ZHANG²,Feng GUO¹

1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Key Laboratory of Film and Coating in Inner Mongolia, Hohhot 010051，China
2. Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016，China

Cite this article:

Shuang YU,Ruiling JIA,Han ZHANG,Wei ZHANG,Feng GUO. Effect of (Gd, Y) Containing-phases on Local Corrosion of Aged GW103K Alloy. Chinese Journal of Materials Research, 2019, 33(3): 199-208.

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Abstract

The cast Mg-10Gd-3Y-0.4Zr (GW103K) alloy was solution treated at 500^oC for 4 h and then aged at 225℃ for 193 h. The microstructure and corrosion performance in NaCl solution of the alloy were assessed by means of scanning electron microscope (SEM), transmission electron microscope (TEM), immersion test and scanning Kelvin probe atomic force microscope (SKPFM). The results show that the alloy shows a microstructure composed of α-Mg matrix with bulk-like Mg₂(Gd, Y) phase and chain-like structure of alternatively arranged phases of (Gd,Y) solid solution and Mg₂(Gd, Y), while the later two phases distributed in grains and/or at grain boundaries. The free corrosion potentials of the two phases (Gd, Y) solid solution and bulk-like Mg₂(Gd, Y) are nobler than that of the α-Mg matrix, thereby the micro-galvanic coupling could form between the former phases with the α-Mg matrix. The (Gd, Y) solid solution and bulk-like Mg₂(Gd, Y) acted as micro-cathodes to promote the corrosion of the surrounding matrix. It is worthy noted that even though the relative potential difference between the (Gd, Y) solid solution and the α-Mg matrix is greater, however, the interface between the (Gd, Y) solid solution and α-Mg matrix is coherent and the interfacial energy of the two phases is lower, thus they may exhibit better chemical compatibility, as a result, the (Gd, Y) solid solution phase may have little influence on the matrix corrosion.

Key words: metallic materials Mg alloy corrosion micro-galvanic SKPFM (Gd,Y) phase relative potential

Received: 31 July 2018

ZTFLH:

TG430.40

Fund: Natural Science Foundation of Inner Mongolia(2016MS0538);Science and Technology Service Network Initiative Program Supporting Project(2016T3030)

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	Han ZHANG
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	Feng GUO

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.483 OR https://www.cjmr.org/EN/Y2019/V33/I3/199

Fig.1 SEM morphologies of GW103K alloy after ageing 193 h

Fig.2 Bright field image of TEM and the SAED pattern (inset) (a), amplified clear bright field image (b), EDS results of bulk-like phase (c), the corresponding Fourier transform (FT) patterns (d), the ring indicates the mask location used for inverse FFT and processed image after inverse FFT corresponding to (b) for bulk-like phase of GW103K after ageing 193 h

Fig.3 Bright field image of chain-like structure (a), bright field image and the SAED pattern (inset) of bulk-like phase mark in (a) of ‘1’ (b), bright field image and the SAED pattern (inset) of bulk-like phase mark in (a) of ‘2’ (c), bright field image and the SAED pattern (inset) of bulk-like phase mark in (a) of ‘3’ (d), bright field image (e) of bulk-like phase mark in (d),the corresponding Fourier transform (FT) patterns (f), the ring indicates the mask location used for inverse FFT and processed image after inverse FFT corresponding to (e), EDS results (g) of bulk-like phase in (c) and EDS results (h) of bulk-like phase in (d) for GW103K alloy after ageing 193 h

Fig.4 HAADF-STEM morphologies of GW103K alloy after ageing 193 h (a) Morphology image of bulk-like Mg₂(Gd, Y) phase before immersion; (b) Corrosion morphology of bulk-like Mg₂(Gd, Y) phase after immersion in 1 mol/L NaCl solution for 15 min

Fig.5 The corrosion morphologies of GW103K alloy aged 193 h after immersion in 3.5% NaCl solution (a) Corrosion morphology of GW103K alloy aged 193 h after immersion for 2 h; (b) Corrosion morphology of chain-like structure at grain boundary after immersion for 30 min; (c) Corrosion morphology of chain-like structure at grain boundary after immersion for 2 h; (d) Corrosion morphology of chain-like structure in grain within after immersion for 2 h

Fig.6 AFM surface topography (a), three-dimensional potential map (b) and the line-profile analysis (c), (d) corresponding shown in (b) for bulk-like Mg₂(Gd, Y) phase in GW103K alloy after ageing 193 h

Fig.7 AFM surface topography (a), three-dimensional potential map (b) and the line-profile analysis (c), (d) corresponding shown in (a) for chain-like structure in GW103K alloy after ageing 193 h

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