Liang Bo-gui, Shen Xiao-ting, Liu Li, Lü Yin-xiang, Yu Zi-dong, Yang Cheng-xin, Zhang Yan-zhen
Department of Stomatology, Xinchang People's Hospital, Xinchang 312500, China.
Zhejiang Da Xue Xue Bao Yi Xue Ban. 2010 Jul;39(4):399-403. doi: 10.3785/j.issn.1008-9292.2010.04.011.
To investigate the effect of pH value and fluoride ions on the corrosion resistance of pure Ti and Ni-Cr-Ti alloy in the artificial saliva.
Electrochemical technique was used to measure the electric potential of corrosion (Ecorr), current density of corrosion (Icorr) and polarization resistance (Rp) of pure titanium and Ti-Ni-Cr alloy in the artificial saliva with different pH value and fluoride concentrations. After electrochemical analysis, microstructure and phase diffraction were examined by FSEM.
With the lower pH value, the Ecorr and Icorr of pure titanium and Ti-Ni-Cr alloy increased, the Rp decreased, there was a significant difference (P<0.05). The Ecorr and Icorr increased markedly, the Rp significantly reduced in the artificial saliva containing 0.2% NaF (P<0.01). FSEM showed that pure titanium and Ti-Ni-Cr alloy surface corrosion, pure titanium in the artificial saliva containing 0.2% NaF was most serious.
Lower pH value decreases the corrosion resistance of pure titanium and Ti-Ni-Cr alloy and the artificial saliva containing fluoride ions decreases the corrosion resistance of pure titanium.
研究pH值和氟离子对纯钛及镍铬钛合金在人工唾液中耐腐蚀性的影响。
采用电化学技术测量不同pH值和氟浓度的人工唾液中纯钛和钛镍铬合金的腐蚀电位（Ecorr）、腐蚀电流密度（Icorr）和极化电阻（Rp）。电化学分析后，用场发射扫描电子显微镜（FSEM）检测微观结构和相衍射。
随着pH值降低，纯钛和钛镍铬合金的Ecorr和Icorr升高，Rp降低，差异有统计学意义（P<0.05）。在含0.2%NaF的人工唾液中，Ecorr和Icorr显著升高，Rp显著降低（P<0.01）。FSEM显示纯钛和钛镍铬合金表面发生腐蚀，含0.2%NaF的人工唾液中纯钛腐蚀最严重。
较低的pH值会降低纯钛和钛镍铬合金的耐腐蚀性，含氟离子的人工唾液会降低纯钛的耐腐蚀性。
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