Effect of SiCp Size on Microstructure and Corrosion Properties of Cast AZ91 Mg-alloys

doi:10.11902/1005.4537.2022.006

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (1): 135-142 DOI: 10.11902/1005.4537.2022.006

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Effect of SiC_p Size on Microstructure and Corrosion Properties of Cast AZ91 Mg-alloys

LV Xin¹, DENG Kunkun¹^,²(

), WANG Cuiju¹, NIE Kaibo¹, SHI Quanxin¹, LIANG Wei¹^,²

^1.School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
^2.Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China

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Abstract

The sub-micron SiC_p, micron SiC_p and dual-scale SiC_p reinforced AZ91 Mg-alloy based composites, namely composites (S1), (M10), and (S1+M9) respectively, were prepared by semi-solid stirring casting method. They were then characterized by means of optical microscope, scanning electron microscope, X-ray diffraction, immersion method, and electrochemical test, etc in terms of the effect of the particle size of SiC_p on the microstructure and corrosion properties of the as-cast AZ91 Mg-alloys. The results show that the addition of SiC_p can refine significantly the semi-continuous network-like Mg₁₇Al₁₂ phase in the AZ91 Mg-alloy, which is attributed to the heterogeneous nucleation effect of SiC_p on the Mg₁₇Al₁₂ phase. The Mg₁₇Al₁₂ phase can be precipitated as Mg₁₇Al₁₂ particles with core of sub-micron SiC_p, and/or directly on the surface of micron SiC_p. By comparing the two composites reinforced with the same volume fraction of SiC_p, it can be found that the corrosion resistance of S1+M9 is significantly lower than that of M10, indicating that when the content of SiC_p is constant, changing the size of SiC_p from micron to sub-micron will reduce the corrosion resistance of the composites.

Key words: AZ91 Mg-alloy SiC_p microstructure corrosion performance

Received: 04 January 2022 32134.14.1005.4537.2022.006

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52001223);National Natural Science Foundation of China(51771128);National Natural Science Foundation of China(51771129)

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	Xin LV
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	Kaibo NIE
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Cite this article:

LV Xin, DENG Kunkun, WANG Cuiju, NIE Kaibo, SHI Quanxin, LIANG Wei. Effect of SiC_p Size on Microstructure and Corrosion Properties of Cast AZ91 Mg-alloys. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 135-142.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.006 OR https://www.jcscp.org/EN/Y2023/V43/I1/135

Fig.1 OM (a-d) and low magnification SEM (e-h) images of the AZ91 Mg-alloy (a, e), S1 (b, f), M10 (c, g) and S1+M9 (d, h)

Fig.2 XRD patterns of the materials: (a) 2θ range from 10° to 80°, (b) 2θ range from 30° to 40°

Fig.3 High magnification SEM images and EDS surface scans of the AZ91 Mg-alloy (a), S1 (b), M10 (c) and S1+M9 (d)

Table 1 EDS analysis of the points in Fig.3 (atomic fraction / %)

Fig.4 Hydrogen evolution amount (a), hydrogen evolution rate (b) with immersion time and corrosion rate of different materials (c)

Fig.5 Impedance curves of different materials in 3.5%NaCl: (a) Nyquist plots; (b) Phase angle-frequency plots; (c) |Z|-frequency plots

Table 2 Fitted electrochemical parameters of impedance curves of different materials after immersion 0.5 h

Table 3 Fitting results of polarization curves in Fig.6

Fig.6 Polarization curves of different materials in 3.5%NaCl solution

Fig.7 Corroded surface morphology of unremoving corrosion products of the AZ91 Mg-alloy (a), S1 (b), M10 (c) and S1+M9 (d) after 10 min immersion; M10 (e) and S1+M9 (f) after 1 h immersion in 3.5%NaCl solution

Fig.8 Section corrosion morphology of the S1 (a, e), AZ91 Mg-alloy (b, f), M10 (c, g) and S1+M9 (d, h) immersed in 3.5%NaCl solution for 7 d after removing corrosion products

Fig.9 Schematic illustration of SiC_p reinforced AZ91 Mg-alloy matrix composites with different sizes under the same volume fraction: (a) micron size, (b) submicron size

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