The Study on the Anti-corrosion Performance of NiTi Alloy in Human Body Solution with the Fabricating Processes of Laser Irradiation and PDMS Modification

doi:10.1007/s42235-021-0011-5

Journal of Bionic Engineering ›› 2021, Vol. 18 ›› Issue (1): 77-91.doi: 10.1007/s42235-021-0011-5

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The Study on the Anti-corrosion Performance of NiTi Alloy in Human Body Solution with the Fabricating Processes of Laser Irradiation and PDMS Modification

Chengjuan Yang1,2, Weiran Cao1,2, Zhen Yang1,2,3, Meng Wang1,2*, Xiubing Jing1,2, Yanling Tian1,2,3

1. School of Mechanical Engineering, Tianjin University, Tianjin 300054, China
2. Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin 300072, China
3. School of Engineering, University of Warwick, Coventry CV4 7AL, UK

Received:2020-08-05 Revised:2020-12-22 Accepted:2020-12-24 Online:2021-01-10 Published:2021-02-10
Contact: Meng Wang E-mail:mw77@tju.edu.cn
About author:Chengjuan Yang1,2, Weiran Cao1,2, Zhen Yang1,2,3, Meng Wang1,2*, Xiubing Jing1,2, Yanling Tian1,2,3

Abstract

Abstract: This paper presents a new and safe method of fabricating super-hydrophobic surface on NiTi Shape Memory Alloy (SMA), which aims to further improve the corrosion resistance performance and biocompatibility of NiTi SMA. The super-hydrophobic surfaces with Water Contact Angle (WCA) of 155.4? ± 0.9? and Water Sliding Angle (WSA) of 4.4? ± 1.1? were obtained by the hybrid of laser irradiation and polydimethylsiloxane (PDMS) modification. The forming mechanism was systematically revealed via Scanning Electron Microscopy (SEM) and X-ray Photoelectron Spectroscopy (XPS). The anti-corrosion of samples was investigated in Simulated Body Fluid (SBF) via the potentiodynamic polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS) tests. PDMS super-hydrophobic coatings showed superior anti-corrosion performance. The Ni ions release experiment was also conducted and the corresponding result demonstrated that the super-hydrophobic samples effectively inhibited the release of Ni ions both in electrolyte and SBF. Besides, biocompatibility was further analyzed, indicating that the prepared super-hydrophobic surfaces present a huge potential advantage in biocompatibility.

Key words: wettability, laser texturing, corrosion resistance, mechanism, human body liquid, Ni ions release

Chengjuan Yang, Weiran Cao, Zhen Yang, Meng Wang, Xiubing Jing, Yanling Tian. The Study on the Anti-corrosion Performance of NiTi Alloy in Human Body Solution with the Fabricating Processes of Laser Irradiation and PDMS Modification[J].Journal of Bionic Engineering, 2021, 18(1): 77-91.

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