Effect of Ce on Microstructure and Corrosion Resistance of Zn-0.6Cu-0.3Ti Alloy

doi:10.11902/1005.4537.2023.149

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (4): 803-811 DOI: 10.11902/1005.4537.2023.149

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Effect of Ce on Microstructure and Corrosion Resistance of Zn-0.6Cu-0.3Ti Alloy

NI Ya¹, SHI Fangchang¹(

), QI Jiqiu²

^1.Jiangsu CUMT Dazheng Surface Engineering Technology CO., Ltd., Xuzhou 221000, China
^2.School of Materials and Physics, China University of Mining and Technology, Xuzhou 221116, China

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Abstract

A series of cast Ce-containing Zn-alloys Zn-0.6Cu-0.3Ti-(0.3-0.6)Ce was prepared, and the effect of Ce addition on the microstructure and corrosion resistance of Zn-0.6Cu-0.3Ti alloy were investigated by means of X-ray diffractometer, scanning electron microscope and electrochemical corrosion test. The results showed that due to the addition of the rare earth Ce, CeZn₅ micron particles emerged in the alloys, which were distributed inside the Zn matrix or at phase boundaries, promoting the growth of the Zn matrix as dendrites and refining the Zn dendrites and secondary dendrites. Correspondingly, the free-corrosion current density of Zn-0.6Cu-0.3Ti alloy decreased rapidly from 2.76×10^-3 A/cm² to 5.85×10^-4 A/cm² after the doping of 0.3% Ce. The effect of Ce content on the corrosion properties of Zn-Cu-Ti-Ce alloy becomes weaker as the corrosion time increases. The impedance spectra of the alloy containing Ce has only one capacitive arc, in the early stage of corrosion, the influence of Ce content on the radius of the capacitive arc is small, with the extension of corrosion time, the influence of Ce becomes more and more obvious, and the overall trend is increasing.

Key words: Zn-Cu-Ti alloys and coating element Ce doping metallographic characteristic corrosion resistance

Received: 08 May 2023 32134.14.1005.4537.2023.149

ZTFLH:

TG174

Corresponding Authors: SHI Fangchang, E-mail: 843337412@qq.com E-mail: 843337412@qq.com

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NI Ya, SHI Fangchang, QI Jiqiu. Effect of Ce on Microstructure and Corrosion Resistance of Zn-0.6Cu-0.3Ti Alloy. Journal of Chinese Society for Corrosion and protection, 2023, 43(4): 803-811.

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.149 OR https://www.jcscp.org/EN/Y2023/V43/I4/803

Table 1 Chemical composition of samples

Fig.1 XRD patterns of Zn-0.6Cu-0.3Ti-Ce alloys: (a) global diffraction peak shifts to the right, (b) comparison of diffraction peak deviation degree with different Ce content

Fig.2 Metallographic structures of Zn-0.6Cu-0.3Ti-Ce alloys: (a) 0 Ce, (b) 0.3 Ce, (c) 0.45 Ce, (d) 0.6 Ce

Fig.3 SEM surface morphology of Zn-0.6Cu-0.3Ti-0.3Ce alloy (a) and EDS results of of the points A (b), B (c) and C (d) marked in Fig.3a, surface image (e) and EPMA elemental mappings of Zn (f), Cu (g), Ti (h) and Ce (i) in the square frame marked in Fig.3e

Fig.4 TEM images and EDS results of Zn-0.6Cu-0.3Ti-0.3Ce alloy: (a, f) microstructure and morphology, (b, c) enlarged views of the red and yellow areas in Fig.4a, (d) diffraction spots of the black phase at point A in Fig.4b, (e) high resolution image of the red circle in Fig.4c, (g) diffraction spots of the phase B in Fig.4f, (h) high resolution image of the phase B in Fig.4f, (i, j) EDS results of the points B and C in Fig.4f

Fig.5 Polarization curves of Zn-0.6Cu-0.3Ti-Ce alloys

Fig.6 Fitting values of polarization curves of Zn-0.6Cu-0.3Ti-Ce alloys immersed for different time: (a) corrosion potential, (b) self-corrosion current

Fig.7 Polarization curves of Zn-0.6Cu-0.3Ti-Ce alloys after corrosion for 5 h (a), 15 h (b), 48 h (c), 120 h (d), 240 h (e) and 480 h (f)

Fig.8 EIS of Zn-0.6Cu-0.3Ti-Ce alloys after corrosion for 0 h (a), 120 h (b), 240 h (c) and 480 h (d)

Table 2 Fitting electrochemical parameters of EIS of Zn-0.6Cu-0.3Ti-Ce alloys immersed for different time

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