Effect of Ag Micro-alloying on Microstructure and Corrosion Behavior of Mg-Zn-Ca Alloy

doi:10.11902/1005.4537.2023.379

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (5): 1274-1284 DOI: 10.11902/1005.4537.2023.379

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Effect of Ag Micro-alloying on Microstructure and Corrosion Behavior of Mg-Zn-Ca Alloy

YIN Jie¹, GAO Yonghao¹(

), YI Fang²

1 School of Materials Science and Engineering, Central South University, Changsha 410083, China
2 Hunan Xiangya Stomatological Hospital, Central South University, Changsha 410000, China

Cite this article:

YIN Jie, GAO Yonghao, YI Fang. Effect of Ag Micro-alloying on Microstructure and Corrosion Behavior of Mg-Zn-Ca Alloy. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1274-1284.

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Abstract

The effect of Ag micro-alloying on the microstructure and corrosion behavior of the as-casted Mg-2Zn-0.2Ca (ZX20) alloy were investigated by means of OM, SEM, electrochemical tests, and hydrogen evolution mass loss method. The results reveal that the addition of 0.5% (mass fraction) Ag affects adversely the corrosion resistance of ZX20 alloy. The corrosion rate increases from 1.63 ± 0.17 mm/a for the ZX20 alloy to 4.06 ± 0.68 mm/a for the Ag-containing alloy (ZXQ200), primarily due to the potential difference between the second phase and the matrix. The dendrite arm spacing of the ZX20 alloy (69.8 ± 24.9 μm) is smaller than that of the ZXQ200 alloy (85.9 ± 23.9 μm), potentially contributing to the greater local corrosion depth observed in the ZXQ200 alloy. The two alloys all consist of α-Mg and Ca₂Mg₆Zn₃ phases with a similar volume fraction of the second phase, and no Ag-rich compounds have been detected for the Ag-alloyed ones. However, the Ag segregation in the second phase results in a heightened potential difference between the second phase and the substrate, elevating it from approximately 60 mV (ZX20) to about 200 mV (ZXQ200). This segregation enhances the micro-galvanic corrosion driving force in the ZXQ200 alloy, resulting in a shorter pitting gestation period and an increase in local corrosion sites.

Key words: Mg-alloy Ag second phase micro-galvanic corrosion

Received: 28 November 2023 32134.14.1005.4537.2023.379

ZTFLH:

T146.2

Fund: Natural Science Foundation of Hunan Province(2023JJ30673)

Corresponding Authors: GAO Yonghao, E-mail: yonghao.gao@outlook.com

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.379 OR https://www.jcscp.org/EN/Y2024/V44/I5/1274

Table 1 Chemical composition of experimental alloys

Fig.1 Vertical section of quaternary phase diagram of Mg-2Zn-0.2Ca-xAg alloys (a) and XRD patterns of the as-casted samples (b)

Fig.2 OM (a, b) and SEM (c, d) images of ZX20 (a, c) and ZXQ200 (b, d) alloys

Table 2 EDS results of the marked points in Fig.2

Fig.3 EPMA images of ZX20 (a) and ZXQ200 (b) alloys

Fig.4 Variations of hydrogen evolution (a) and hydrogen evolution rate (b) vs time of ZX20 and ZXQ200 alloys immersed in saline solution at 37 ± 1^oC

Fig.5 Open circuit potential (a), cathodic (b) and anodic (c) potentio-dynamic polarization curves of ZX20 and ZXQ200 alloys

Table 3 Fitting results of cathodic potentio-dynamic polarization curves

Fig.6 Nyquist (a, b) and Bode (c) plots of ZX20 (a, c) and ZXQ200 (b, c) alloys after immersion in saline solution at 37 ± 1^oC for 1 h

Table 4 Fitting results of EIS data for ZX20 and ZXQ200 alloys

Fig.7 Optical micrographs showing the macroscopic surfaces of ZX20 and ZXQ200 alloys after immersion in saline solution at 37 ± 1^oC for various time (a) and responding curves of corroded area evolution (b)

Fig.8 SEM images of ZX20 (a-c) and ZXQ200 (d-f) alloys with (a, b, d, e) and without (c, f) corrosion products after immersion in saline solution at 37 ± 1^oC for 30 min

Fig.9 Cross-section images of ZX20 (a) and ZXQ200 (b) alloys after immersion in saline solution at 37±1℃ for 5 d

Fig.10 SKPFM images (a, b) and responding potential curves (c, d) of ZX20 (a, c) and ZXQ200 (b, d) alloys

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