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首页> 外文会议>International Symposium on Metastable and Nano-Materials(ISMANAM-2005); 20050703-07; Paris(FR) >Corrosion resistance of Cu-Zr-Al-Y and Zr-Cu-Ni-Al-Nb bulk metallic glasses
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Corrosion resistance of Cu-Zr-Al-Y and Zr-Cu-Ni-Al-Nb bulk metallic glasses

机译：Cu-Zr-Al-Y和Zr-Cu-Ni-Al-Nb大块金属玻璃的耐腐蚀性

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摘要

Electrochemical tests of amorphous Cu_(46)Zr_(42)Al_7Y_5 in comparison to amorphous Zr_(58.5)Cu_(15.6)Ni_(12.8)Al_(10.3)Nb_(2.8) (Vitl06a) were conducted by potentiodynamic polarization at room temperature in 0.001-0.1 M NaCl_(aq) (pH 8). The influence of corrosion on the surface topography was studied by X-ray diffraction and SEM. Electrochemical measurements indicate a good corrosion resistance of both bulk metallic glasses in NaCl solutions with low molarity at pH 8 due to the formation of protective oxide films. However, at high NaCl molarity the Cu-Zr-Al-Y glass shows no passive layer and is very susceptible to pitting corrosion. The mechanisms of the formation of the oxide films as well as the nucleation and growth of pitting were clarified by associating microstructural investigations with the results of electrochemical measurements.
机译：非晶态Cu_（46）Zr_（42）Al_7Y_5与非晶态Zr_（58.5）Cu_（15.6）Ni_（12.8）Al_（10.3）Nb_（2.8）（Vitl06a）的电化学测试是在室温下于0.001进行的。 -0.1 M NaCl_（水溶液）（pH 8）。通过X射线衍射和SEM研究了腐蚀对表面形貌的影响。电化学测量表明，由于形成了保护性氧化膜，两种大块金属玻璃在pH为8的低摩尔浓度的NaCl溶液中均具有良好的耐腐蚀性。但是，在高NaCl摩尔浓度下，Cu-Zr-Al-Y玻璃没有钝化层，非常容易发生点蚀。通过将微观结构研究与电化学测量结果相关联，阐明了氧化膜的形成机制以及点蚀的成核和生长机理。

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