H_2O_2对镍铬合金电化学腐蚀性能及离子析出的影响

The effect of hydrogen peroxide on the electrochemical corrosion properties and metal ions release of nickel-chromium dental alloys

目的:比较不同浓度H2O2对镍铬合金电化学腐蚀性能及离子析出的影响。方法:应用电化学工作站的电化学阻抗谱法和动电位极化曲线法,对不同浓度H2O2浸泡112 h后的牙科镍铬合金在人工唾液中的腐蚀行为进行比较,并用电感耦合等离子体质谱仪检测电化学腐蚀后人工唾液介质中析出的金属离子浓度。采用SPSS 13.0软件包对数据进行方差分析。结果:0%H2O2浸泡112 h后,镍铬合金在人工唾液中等效电路极化电阻Rct、腐蚀电位Ecorr、点蚀击穿电位Eb以及代表合金表面的"伪钝化"的△E(Ecorr与Eb之差)最大,而30%H2O2浸泡112 h后,镍铬合金在人工唾液中的Rct、Ecorr、Eb以及△E最小,不同浓度H2O2浸泡后镍铬合金耐腐蚀性能顺序为30%<10%<0%(P<0.05);镍铬合金在人工唾液介质中析出的金属离子Ni、Cr、Mo浓度大小顺序为0%<10%<30%(P<0.05)。结论:镍铬合金在不同浓度H2O2中浸泡112 h后,其在人工唾液中的耐腐蚀性能发生了一定变化,随着H2O2浓度的升高,越来越容易腐蚀,且人工唾液介质中析出的金属离子浓度也越来越高。

PURPOSE： To investigate the effect of hydrogen peroxide on the electrochemical corrosion and metal ions release of nickel-chromium dental alloys. METHODS： The corrosion resistance of nickel-chromium dental alloys was compared by electrochemical impedance spectroscopy （EIS） and potentiodynamic polarization curve （PD） methods in artificial saliva after immersed in different concentrations of hydrogen peroxide for 112 h. The metal ions released from nickel-chromium dental alloys to the artificial saliva were detected after electrochemical measurements using inductively coupled plasma mass spectrometry （ICP-MS）. The data was statistically analyzed by analysis of variance （ANOVA） using SPSS 13.0 software package. RESULTS： The electrochemical experiment showed that the sequence of polarization resistance in equivalent circuit （Rct）, corrosion potential （Ecorr）, pitting breakdown potential （Eb）, and the difference between Ecorr and Eb representing the ＂pseudo-passivation＂ （AE） of nickel-chromium alloys in artificial saliva was 30% 〈 10% 〈 0%（P〈0.05）. Furthermore, the metal ions including Ni, Cr, and Mo were released from the Ni-Cr alloys to the artificial saliva, and the order of the concentrations of metal ions was 0% 〈 10% 〈 30% （P〈0.05）. CONCLUSIONS： The corrosion resistance of nickel-chromium dental alloys decrease after immersed in different concentrations of hydrogen peroxide for 112 h. Nickel-chromium dental alloys are more prone to corrosion in the artificial saliva with the concentration of hydrogen peroxide increased, and more metal ions are released in the artificial saliva. Supported by Natural Science Foundation of Shanghai Municipality （12ZR1427200）, Shanghai Municipal Health Bureau Fund （20124172） and Shanghai Municipal Health Bureau Youth Fund （20114Y053）.