Degradation Behavior of Pure Zinc and Zn-xLi Alloy in Artificial Urine

doi:10.11902/1005.4537.2020.205

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (6): 765-774 DOI: 10.11902/1005.4537.2020.205

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Degradation Behavior of Pure Zinc and Zn-xLi Alloy in Artificial Urine

LU Lili¹, LIU Lijun¹, YAO Shenglian¹, LI Huafang¹, WANG Luning¹^,²(

)

^1.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
^2.State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

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Abstract

Zn-based materials have been adopted as candidate material of biodegradable implants and some researches give the evidence that Zn-based materials are promising as degradable scaffold. This paper will reveal the degradation behavior of Zn-xLi (x=0, 0.5%, 0.8%) alloys in artificial urine (AU). The corrosion behavior of pure Zn and Zn-xLi alloys in AU up to 28 d were investigated by means of immersion test and electrochemical approach. The results indicate that even the Zn and Zn-xLi alloys display encrustation in artificial urine, however, the encrustation degree in the present study was alleviated compared with other alloys studied previously, which seems a very encouraging phenomenon in the application for ureteral stent implantation. The corrosion products of the Zn and Zn-xLi alloys in AU was CaZn₂(PO4)₂·2H₂O and the corresponding corrosion rate was in the range of 0.21 to 0.34 mm·a^-1 for the Zn and Zn-xLi alloys after immersion for 28 d.

Key words: degradation Zn-Li alloy ureteral stent artificial urine

Received: 22 October 2020

ZTFLH:

TG172

Fund: National Key Research and Development Program of China(2016YFC251100);National Natural Science Foundation of China(51503014)

Corresponding Authors: WANG Luning E-mail: luning.wang@ustb.edu.cn

About author: WANG Luning, E-mail: luning.wang@ustb.edu.cn

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Cite this article:

LU Lili, LIU Lijun, YAO Shenglian, LI Huafang, WANG Luning. Degradation Behavior of Pure Zinc and Zn-xLi Alloy in Artificial Urine. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 765-774.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.205 OR https://www.jcscp.org/EN/Y2021/V41/I6/765

Fig.1 OCPwith respect to time at different immersion periods of pure Zn (a), Zn-0.5Li (b), Zn-0.8Li (c) and OCP of pure Zn as a function of immersion time (d)

Fig.2 PDP curves at different immersion periods in AU of pure Zn (a), Zn-0.5Li (b), Zn-0.8Li (c) and the current density obtained from PDP curves (d)

Table 1 Polarization data of the pure Zn/Zn-xLi at different immersion periods in AU

Fig.3 Nyquist diagrams of pure Zn (a), Zn-0.5Li (b), Zn-0.8Li (c) after immersion for different periods in AU, equivalent electrical circuit (d) and changes of R_f (e) and R_t (f) with immersion time

Table 2 Fitted electrochemical parameters for Zn/Zn-xLi in AU

Table 3 Corrosion rates of pure Zn and Zn-xLi in AU obtained from the electrochemical measurements (mm·a^-¹)

Fig.4 SEM images of pure Zn (a1~e1), Zn-0.5Li (a2~e2) and Zn-0.8Li (a3~e3) immersed in AU after 3 d (a), 7 d (b), 14 d (c), 21 d (d) and 28 d (e)

Table 4 Atomic ratio of P/Zn on the surfaces after immersed in AU for different time

Fig.5 Cross-section of pure Zn (a1~c1), Zn-0.5Li (a2~c2) and Zn-0.8Li (a3~c3) immersed in AU after 3 d (a), 14 d (b) and 28 d (c)

Fig.6 Variation of pH vibration (a), Zn²⁺ release of AU (b) and encrustation (c) of pure Zn, Zn-0.5Li and Zn-0.8Li during the immersion in AU at different time interval

Fig.7 XRD analysis of surface pure Zn (a), Zn-0.5Li (b) and Zn-0.8Li (c)

Fig.8 Schematic illustration of corrosion process of Zn and Zn-xLi alloys in the AU: (a) first stage, (b) second stage, (c) third stage

Table 6 Encrustation of Zn/Zn-xLi and some other alloys (mg·cm^-2)

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