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Acta Metall Sin  2007, Vol. 42 Issue (1): 82-86     DOI:
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Corrosion Behavior and Anticorrosion Mechanism of Cu-Zr-Ti-Ni-Mo Bulk Metallic Glass
Liu Bing;;
华中科技大学材料学院博03级
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Liu Bing. Corrosion Behavior and Anticorrosion Mechanism of Cu-Zr-Ti-Ni-Mo Bulk Metallic Glass. Acta Metall Sin, 2007, 42(1): 82-86 .

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Abstract  (Cu47Zr11Ti34Ni8)100-xMox (x = 0, 2 at.%) bulk metallic glasses (BMGs) were produced by copper mould casting. The amorphous feature of the samples was characterized by X-ray diffraction (XRD). The corrosion resistance and corrosion mechanism of the two BMGs in 1 mol/L H2SO4 solution open to air were studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. It is found that the BMG with 2 at.% Mo exhibited a superior corrosion resistance over the base alloy, as indicated by a considerable increase in pitting potential (Eb) and significant decrease in passive potential (E0) and passive current density (ip) for the Mo-bearing BMG. EIS results revealed that the micro-addition of Mo increased the surface activity and promoted the generation of positive defects (i.e., oxygen vacancies), but suppressed the formation of negative defects at the interfaces between metal/passive film (M/F). As a result, the addition of Mo could speed up the formation of the passive film of Zr-, and Ti-oxides, and stabilize simultaneously the oxides film. Base on point defect model (PDM), a qualitatively kinetic model is established to explain tentatively the effect of micro-additionn of Mo on the improvement of the corrosion resistance of the Cu-based bulk metallic glasses.
Key words:  Cu-based bulk metallic glasses      Micro-addition      Mechanism of corrosion resistance      Passive film      Electr     
Received:  29 March 2006     
ZTFLH:  TG139.8  
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