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目的:在模拟口腔环境中,研究碳-二氧化硅(C-SiO_2)复合薄膜对钴铬合金耐腐蚀性能的影响,为临床应用提供依据。方法:使用真空旋转涂布法在单晶硅片基底表面均匀旋涂C-SiO_2复合薄膜,用于了解C-SiO_2复合薄膜的参数。选用钴铬合金,制成20 mm×20 mm×0.5 mm试件,运用真空旋转涂层布法在钴铬合金表面均匀旋涂一层C-SiO_2复合薄膜。通过电感耦合等离子体发射光谱仪测量并比较涂层前、后试件浸泡液中Co、Cr、Mo的离子浓度;采用电化学工作站进行塔菲尔极化曲线测试电化学耐腐蚀性能。采用SAS8.0软件包对数据进行统计学分析。结果:电感耦合等离子体发射光谱仪测量结果显示,涂层后,试件浸泡液中Co、Cr、Mo的离子浓度显著小于钴铬合金。塔菲尔极化曲线可见钴铬合金涂层后自腐蚀电位向正方向移动,从-0.261 V上升至-0.13 V;自腐蚀电流密度呈下降趋势,从-5.0017μA/cm~2下降至-5.3006μA/cm~2。结论:C-SiO_2复合薄膜(SiO_2=61.71wt%)能显著减少金属离子的释放,有效提高钴铬合金的耐腐蚀性能,具有良好的临床应用前景。
OBJECTIVE: To study the effect of carbon-silicon dioxide (C-SiO_2) composite film on the corrosion resistance of cobalt-chromium alloy in simulated oral cavity environment and provide the basis for clinical application. Methods: C-SiO_2 composite films were spin-coated on the surface of single-crystal silicon wafer by vacuum spin-coating to understand the parameters of C-SiO_2 composite films. Cobalt-chromium alloy was selected to make a 20 mm × 20 mm × 0.5 mm specimen. A layer of C-SiO 2 composite film was spin-coated on the surface of cobalt-chromium alloy by vacuum spin coating method. The ion concentration of Co, Cr, Mo in the soaking solution before and after the coating was measured and compared by inductively coupled plasma atomic emission spectrometer. The electrochemical corrosion resistance was tested by Tafel polarization curve using electrochemical workstation. SAS8.0 software package for statistical analysis of the data. Results: The results of inductively coupled plasma atomic emission spectrometer showed that the ion concentrations of Co, Cr and Mo in the soaking solution were significantly lower than that of cobalt-chromium alloy after coating. The Tafel polarization curve shows that the corrosion potential of cobalt-chromium alloy moves in the positive direction from -0.261 V to -0.13 V, and the self-corrosion current density decreases from -5.0017μA / cm 2 to - 5.3006μA / cm ~ 2. CONCLUSION: The C-SiO 2 composite film (SiO 2 = 61.71 wt%) can significantly reduce the release of metal ions and effectively improve the corrosion resistance of the cobalt-chromium alloy, which has a good clinical application prospect.