Effects of Ce(NO3)2 Concentration and Silicate Sealing Treatment on Calcium Phosphating Film on Surface of Mg-Zn-Y-Ca Alloy for High Speed Railway Corbel

doi:10.11902/1005.4537.2021.202

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (6): 849-856 DOI: 10.11902/1005.4537.2021.202

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Effects of Ce(NO₃)₂ Concentration and Silicate Sealing Treatment on Calcium Phosphating Film on Surface of Mg-Zn-Y-Ca Alloy for High Speed Railway Corbel

ZHOU Dianmai¹, JIANG Lei²(

), WANG Meiting², LIANG Hongjia², XIAO Yunlong², ZHENG Li², YU Baoyi²

^1.CRRC Changchun Railway Vehicles Co. Ltd. , Changchun 130062, China
^2.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110023, China

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Abstract

With the demand for continuous increment in the running speed of high-speed trains, the standards for lightweight and ride comfort requirements have also been raised. Mg-alloy has become an inevitable trend as a critical material for high-speed trains made of alloy. The effect of Ce(NO₃)₂ concentration as rare earth additive in silicate containing solution for sealing treatment on the performance of calcium phosphating coating of Mg-Zn-Y-Ca alloy for swing bolster were studied by means of drop test, full immersion test, electrochemical test, scanning electron microscope and XRD analysis. The results show that the sealing treatments with and without the addition of Ce(NO₃)₂ all can improve the structure and corrosion resistance of the coating, and the optimal addition of Ce(NO₃)₂ is 0.8 g/L. Correspondingly, the acquired coating has the best corrosion resistance after sealing treatment, with an average drop time of 1002 s before break down of the coating, the corrosion rate of 0.0372 mg/(cm²·h), and the corrosion current density of 4.971×10^-6 A/cm², and the coating resistance R_f is 4854 Ω·cm². The corrosion resistance of magnesium alloy can be greatly improved through phosphating and sealing treatment, which can meet the service requirements of high-speed iron pillow beam.

Key words: calcium phosphating film Ce(NO₃)₂ hole sealing process corrosion resistance Mg-alloy

Received: 18 August 2021

ZTFLH:

TG174

Fund: China National Railway Group Co. Ltd., Science and Technology Research and Development Plan(P2020J024)

Corresponding Authors: JIANG Lei E-mail: 1138027122@qq.com

About author: JIANG Lei, E-mail: 1138027122@qq.com

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Cite this article:

ZHOU Dianmai, JIANG Lei, WANG Meiting, LIANG Hongjia, XIAO Yunlong, ZHENG Li, YU Baoyi. Effects of Ce(NO₃)₂ Concentration and Silicate Sealing Treatment on Calcium Phosphating Film on Surface of Mg-Zn-Y-Ca Alloy for High Speed Railway Corbel. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 849-856.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.202 OR https://www.jcscp.org/EN/Y2021/V41/I6/849

Fig.1 Surface micro-topographies of calcium phosphating films with 0 g/L (a), 0.4 g/L (b), 0.8 g/L (c), 1.2 g/L (d), 1.6 g/L (e) and 2.0 g/L (f) of Ce(NO₃)₂

Fig.2 Cross-sectional morphologies of calcium phosphating films without (a) and with (b) rare earth treated

Fig.3 EDS analysis of calcium phosphating film without (a) and with (b) rare earth treated

Fig.4 XRD pattern of calcium phosphating film without (a) and with (b) rare earth treated

Table 1 Drop experiment results of calcium phosphating process at different concentrations of Ce(NO₃)₂

Fig.5 Polarization curves of substrate and calcium phosphating samples at different concentrations of Ce(NO₃)₂

Table 2 Immersion experiment results of calcium phosphating process at different concentrations of Ce(NO₃)₂

Table 3 Polarization fitting results of substrate and calcium phosphating samples at different concentrations of Ce(NO₃)₂

Fig.6 EIS result of substrate and calcium phosphated samples at different concentrations of Ce(NO₃)₂

Fig.7 Equivalent circuit diagram of EIS

Table 4 EIS fitting results of calcium phosphating samples at different concentrations of Ce(NO₃)₂

Fig.8 Surface micro-topographies (a, b) and EDS analysis (c) of calcium phosphating film after sealing treatment

Fig.9 XRD pattern of calcium phosphating film after sealing treatment

Fig.10 Surface macro-topographies of Mg-alloy specimen after immersion corrosion: (a) substrate, (b) unsealed hole test, (c) calcium system sealed hole sample

Fig.11 Polarization curves (a) and EIS (b) of samples after different calcium phosphating processes

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