Surface analysis and corrosion behavior of pure titanium under fluoride exposure
Surface analysis and corrosion behavior of pure titanium under fluoride exposure
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DOI：
10.1016/j.prosdent.2020.02.022
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发表时间：
2020-08-01
影响因子：
4.6
通讯作者：
Qiu, Jing
中科院分区：
文献类型：
--
作者：
Chen, Wan-Qing;Zhang, Song Mei;Qiu, Jing
陈述问题。口腔含氟产品对钛的腐蚀作用已有报道，而引起高氟血症的慢性氟中毒是世界性的健康问题之一。然而，高血清氟与钛表面腐蚀之间的关系，可能对钛种植体骨结合产生不利影响，尚未阐明。本体外研究的目的是基于表面分析、材料和方法研究纯钛暴露于不同pH值的高血清氟化物中的腐蚀行为。纯钛试样，暴露于不同的电解质与0.04和0.4 ppm的氟化钠在pH值7.3和5.0的值，进行了检查的表面微观结构，通过使用扫描电子显微镜（SEM）和表面元素组成与X射线光电子能谱（XPS）。采用电化学阻抗谱（EIS）和电感耦合等离子体原子发射光谱（ICP-AES）研究了试样在含0.04和0.4ppm血清氟（NaF）、pH值为7.3和5.0的Hanks平衡盐溶液（HBSS）中的腐蚀行为和金属离子的释放。纯钛表面暴露于高氟血清中，观察到点蚀孔。随着血清氟浓度的增加，表面变得粗糙，特别是在酸性条件下。XPS分析表明，在血清氟暴露下，纯钛表面上的主要二氧化钛（TiO 2）减少，对应于F的相对水平增加。电化学阻抗谱（EIS）结果表明，纯钛在高氟血清中的腐蚀行为较为活跃，随着氟血清浓度的增加，纯钛的耐蚀性逐渐降低，在酸性条件下，耐蚀性下降更为严重。高血清氟和酸性条件也可诱导钛离子的释放。高氟对纯钛的腐蚀行为有负面影响。在氟离子环境中，钛氧化膜的阻挡层被破坏，纯钛的耐蚀性随着氟离子浓度的增加而降低。纯钛的腐蚀敏感性增加，加速了暴露于高血清氟化物后钛离子的释放;这在酸性环境中更加明显。
Statement of problem. The corrosive effects of oral fluoride products on titanium have been reported, and chronic fluorosis, which causes hyperfluoemia, is one of the world's health problems. Nevertheless, the relationship between high serum fluoride and corrosion on the titanium surface, which might have adverse effects on titanium implant osseointegration, has not been elucidated.Purpose. The purpose of this in vitro study was to investigate the corrosion behavior of pure titanium exposed to high serum fluoride with different pH values based on surface analysis.Material and methods. Pure titanium specimens, exposed to different electrolytes with 0.04 and 0.4 ppm NaF at pH 7.3 and 5.0 values, were examined for surface microstructure by using scanning electron microscopy (SEM) and for surface element composition with X-ray photoelectron spectroscopy (XPS). The corrosion behavior and metal ion release of specimens immersed in the Hanks' balanced salt solution (HBSS) containing 0.04 and 0.4 ppm serum fluoride concentrations (NaF) at 7.3 and 5.0 pH values were measured by electrochemical impedance spectroscopy (EIS) and inductively coupled plasma atomic emission spectrometry (ICP-AES).Results. Pitting holes were observed on pure titanium surfaces exposed to high serum fluoride. The surfaces became rougher with the increase of serum fluoride concentration, especially under acidic conditions. XPS analysis revealed a reduction of dominant titanium dioxide (TiO2) on the pure titanium surface under serum fluoride exposure, corresponding to an increase in the relative level of F. EIS data showed an active corrosion behavior of pure titanium exposed to high serum fluoride and gradually decreased corrosion resistance with increasing concentration of serum fluoride, which was more severe under acidic conditions. The release of titanium ions was also induced by high serum fluoride and acidic conditions.Conclusions. High serum fluoride had a negative influence on the corrosion behavior of pure titanium. The titanium oxide film barrier could be broken down in the fluoride ions condition, and the corrosion resistance of pure titanium decreased with the increasing concentration of serum fluoride. The increased corrosion susceptibility of pure titanium accelerated the release of titanium ions after exposure to high serum fluoride; this was more pronounced in an acidic environment.