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目的:研究氮化钛涂层对镍铬合金在模拟口腔含氟环境中耐腐蚀性和耐磨性能的影响。方法:镍铬合金表面采用物理气相沉积法沉积氮化钛(TiN),表面涂层后,置于含0.24%NaF人工唾液中,应用Parstat2273型电化学工作站,测定涂层前、后的动电位极化曲线;并应用HXD-1000TMC/LCD显微硬度计测定涂层前后的维氏硬度,采用SAS8.2软件包对数据进行t检验。结果:镍铬合金表面涂TiN处理前,自腐蚀电位为-362.407mV,自腐蚀电流密度为1.568uAcm-2,破钝电位为426mV。镍铬合金表面涂TiN后,自腐蚀电位为-268.638mV,自腐蚀电流密度为0.114μAcm-2,破钝电位为1142mV。涂层后,自腐蚀电位和破钝电位升高,自腐蚀电流密度降低。涂层前平均维氏硬度为519.75±27.27,涂层后平均维氏硬度为803.24±24.64。涂层前后差值的均数为283.49±39.34(P<0.01)。涂层前后维氏硬度差值有显著差异,涂层后合金表面硬度提高。结论:镍铬合金表面TiN涂层能提高镍铬合金在口腔含氟环境中的耐腐蚀性能,同时提高其耐磨性能。
OBJECTIVE: To study the effect of titanium nitride coating on the corrosion resistance and wear resistance of Ni-Cr alloy in simulating oral fluoridation. Methods: The surface of Ni-Cr alloy was deposited by physical vapor deposition (TiN). After surface coating, it was placed in 0.14% NaF artificial saliva. Parstat 2273 electrochemical workstation was used to measure the dynamic potentials before and after coating Polarization curves were measured. Vickers hardness before and after coating was measured by HXD-1000TMC / LCD microhardness tester. SAS8.2 software package was used for t test. Results: Before the TiN treatment, the self-corrosion potential was -362.407mV, the self-corrosion current density was 1.568uAcm-2 and the blunt potential was 426mV. NiTi alloy surface coated with TiN, the self-corrosion potential of -268.638mV, self-corrosion current density of 0.114μAcm-2, broken blunder potential of 1142mV. After coating, the self-corrosion potential and breaking potential increase, the self-corrosion current density decreases. The average Vickers hardness before coating was 519.75 ± 27.27, and the average Vickers hardness after coating was 803.24 ± 24.64. The mean of the difference before and after coating was 283.49 ± 39.34 (P <0.01). Vickers hardness before and after the difference was significantly different coating hardness after the alloy surface increased. Conclusion: TiN coating on the surface of Ni-Cr alloy can improve the corrosion resistance of Ni-Cr alloy in fluoride-containing environment of oral cavity and improve its wear resistance.