Dynamic Corrosion Trail of Ti-6Al-4V Alloy in Acid Artificial Saliva Containing Fluoride Ion
- PDF / 1,332,371 Bytes
- 11 Pages / 595.276 x 841.89 pts (A4) Page_size
- 5 Downloads / 172 Views
794 DOI
https: //doi. org/10.1007/s11595-020-2322-5
Dynamic Corrosion Trail of Ti-6Al-4V Alloy in Acid Artificial Saliva Containing Fluoride Ion YANG Lixia1,2, WU Yuntao1, CHEN Shuo1, XIAO Yuanqiang1, CHEN Sen1, HAO Shuo1, WANG Junxia1
(1. Faculty of Material science and Chemistry, China University of Geosciences, Wuhan 430074, China; 2. Engineering Research Center of Nano-Geo Materials of Ministry of Education, China University of Geosciences, Wuhan 430074, China)
Abstract: The dynamic corrosion behaviors of Ti-6Al-4V alloy in acid artificial saliva containing fluoride ion were traced using electrochemical techniques, optical microscope, scanning electron microscopy, energy dispersive spectrometer and roughness tester. The experimental results indicate that a negative shift of corrosion potential as well as a continuous decrease in impedance for the alloy exists with increasing immersion time, and the degradation rate of the alloy presents the trend of first increase then decrease following the dissolution of passivation film and the formation of corrosion products. The accumulated fluoride ion on the alloy surface accelerates the fracture of passivation film, and the occurrence and development of corrosion of alloy are mainly located at the sites where the formation and shedding of white particles are composed of fluoride compounds, resulting in the decrease of corrosion resisting property of the alloy. A possible model is proposed to elaborate the dynamic corrosion behavior of the alloy. Key words: Ti-6Al-4V; fluoride ion; corrosion; saliva; alloy
1 Introduction The self-repair capacity of teeth is feeble as a result of its vulnerable features, researchers try to counter the dentistry problems from two aspects. On the one hand, artificial restoration materials such as Ti-based alloy are widely used due to their excellent combination of physical and chemical properties, for example, high mechanic strength, low density and good biocompatibility[1-5]. On the other hand, fluoride remineralization agents are added into tap water and commercial products such as toothpastes and mouth rinses for preventing dental caries[6,7]. However, it is unquestionable that the corrosion of Ti-based alloy will occur via electrochemical reactions occurring at the interface between the alloy and saliva, resulting in the direct decrease of service life of the alloy[8-13], especially in acidic saliva containing fluoride ion[2,10,11,14,15]. Therefore, it © Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: July 12, 2019; Accepted: Oct. 21, 2019) YANG Lixia(杨丽霞): Prof.; E-mail: [email protected] Funded by the National Natural Science Foundation of China (No.50801057) and the Engineering Research Center of Nano-Geo Materials of Ministry of Education, China University of Geosciences (No.NGM2018KF015)
is very essential to investigate the corrosion behavior of Ti-based alloy in simulated acid saliva containing fluoride ion, which can provide scientific basis not only for evaluating
Data Loading...
