Electrochemical Corrosion Behavior of 3D-printed NiTi Shape Memory Alloy in a Simulated Oral Environment

doi:10.11902/1005.4537.2023.141

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (4): 781-786 DOI: 10.11902/1005.4537.2023.141

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Electrochemical Corrosion Behavior of 3D-printed NiTi Shape Memory Alloy in a Simulated Oral Environment

LIU Ming¹(

), WANG Jie², ZHU Chunhui³, ZHANG Yanxiao⁴

^1.State Key Laboratory of Strength of Metal Materials, School of Materials Science and Engineering, Xi 'an Jiaotong University, Xi 'an 710049, China
^2.Shaanxi Zhou Doctor Dental Medical Co., Ltd., Xi 'an 710086, China
^3.Department of Periodontology, College of Stomatology, Xi'an Jiaotong University, Xi 'an 710004, China
^4.Department of Orthodontic, Wuxi Hospital of Stomatology, Wuxi 214000, China

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Abstract

The electrochemical corrosion behavior of 3D-printed NiTi shape memory alloy in various types of artificial saliva was studied by means of open circuit potential measurement, polarization curve, electrochemical impedance spectroscopy and Mott-Schottky. The results show that with the increasing time of immersion in an artificial saliva, the open circuit potential of 3D-NiTi alloy shifted positively, while the thermodynamic stability of the alloy is improved. The alloy exhibited typical passivation characteristics, and the corrosion resistant and stable passive film might form. After Coke was added to the artificial saliva, the thermodynamic stability of the alloy decreased, the polarization curve moved to the lower left, the free-corrosion potential shifted negatively, and the corresponding corrosion current density increased. After adding 1% NaF, the thermodynamic stability of the alloy decreases sharply, showing an active corrosion state. The number of defects of the passive film increases 3.7 times, and F^- can greatly damage the integrity of the passive film.

Key words: 3D-NiTi artificial saliva coke F^- electrochemical impedance spectroscopy

Received: 06 May 2023 32134.14.1005.4537.2023.141

ZTFLH:

TG174

Fund: Natural Science Foundation of Shaanxi Province(2019JQ-609)

Corresponding Authors: LIU Ming, E-mail: liuming0313@xjtu.edu.cn

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Cite this article:

LIU Ming, WANG Jie, ZHU Chunhui, ZHANG Yanxiao. Electrochemical Corrosion Behavior of 3D-printed NiTi Shape Memory Alloy in a Simulated Oral Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(4): 781-786.

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.141 OR https://www.jcscp.org/EN/Y2023/V43/I4/781

Fig.1 OCP of 3D-NiTi alloy immersed in various artificial saliva for 168 h

Fig.2 Polarization curves of 3D-NiTi alloy immersed in various artificial saliva for 30 min

Table 1 Fitting result of polarization curves of 3D-NiTi alloy immersed in various artificial saliva for 30 min

Fig.3 Nyquist (a1-c1) and Bode (a2-c2) diagrams of 3D-NiTi alloy immersed for different time in the artificial saliva of AS (a), AS+Coke (b), AS+1% NaF (c)

Fig.4 Changes of ǀZǀ_{0.01 Hz} value of 3D-NiTi alloy during immersion in various artificial saliva

Fig.5 Equivalent circuit diagram of EIS of 3D-NiTi alloy during immersion in various artificial saliva

Table 2 Fitting result of EIS curves of 3D-NiTi alloy immersed in various artificial saliva for different time

Fig.6 Mott-Schottky curves of 3D-NiTi alloy immersed in various artificial saliva for 48 h

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