Hu Bin, Zhang Fu-qiang
Department of Prosthodontics, School of Stomatology, Ninth People's Hospital, Shanghai Second Medical University, Shanghai 200011, China.
Shanghai Kou Qiang Yi Xue. 2003 Apr;12(2):132-5.
The aim of this study was to investigate the variation of the corrosion resistance of Ni-Cr alloy in acid environment before and after coating titanium in vitro.
artificial saliva; pH = 7.0 and pH = 5.6; temperature: 36.5 degrees C 3. Electrochemical test: polarization curve; instrument: ZF-3 poteniostat.
Before coating titanium, when pH was 7.0, the electrode potential of Ni-Cr alloy was -160 mV, and the self-corrosion current density was 0.262 microA cm-2; when pH = 5.6, the data were -182 mV and 0.352 microA cm-2, respectively. This result showed that when pH value reduced, the potential and current density descended, too. This indicated that the material was easy to be corroded. After coating titanium, when pH value was 7.0, the potential was -71 mV, the self-corrosion current density was 0.152 microA cm-2; when pH = 5.6, the data were -89 mV and 0.174 microA cm-2. This indicated that the corrosion rate of material descended evidently after coating titanium in acid environment.
(1) Not only before coating Ti but also after coating, the corrosion resistance of Ni-Cr alloy would descend in acid environment;(2) In acid environment, the corrosion resistance of Ni-Cr alloy after coating titanium was superior to that of the material before coating. So was in neutral environment.
本研究旨在体外研究镍铬合金在涂覆钛前后在酸性环境中的耐腐蚀性变化。
人工唾液；pH = 7.0和pH = 5.6；温度：36.5摄氏度 3. 电化学测试：极化曲线；仪器：ZF - 3恒电位仪。
涂覆钛之前，当pH为7.0时，镍铬合金的电极电位为 - 160 mV，自腐蚀电流密度为0.262 μA/cm²；当pH = 5.6时，数据分别为 - 182 mV和0.352 μA/cm²。该结果表明，当pH值降低时，电位和电流密度也下降。这表明该材料易于被腐蚀。涂覆钛之后，当pH值为7.0时，电位为 - 71 mV，自腐蚀电流密度为0.152 μA/cm²；当pH = 5.6时，数据分别为 - 89 mV和0.174 μA/cm²。这表明在酸性环境中涂覆钛后材料的腐蚀速率明显下降。
(1) 无论是涂覆钛之前还是之后，镍铬合金在酸性环境中的耐腐蚀性都会下降；(2) 在酸性环境中，涂覆钛后的镍铬合金的耐腐蚀性优于涂覆前的材料。在中性环境中也是如此。
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