Al_(86)Fe_(10)Zr_4非晶合金的晶化与腐蚀行为研究

Crystallization and Corrosion Resistance of Al_(86)Fe_(10)Zr_4 Amorphous Ribbons

利用甩带法制备出Al86Fe10Zr4非晶薄带,用X射线衍射仪和差示扫描量热计对该非晶的非晶特性及晶化过程进行了研究。结果表明,Al86Fe10Zr4非晶薄带的晶化过程为两步晶化,其晶化温度分别约为603和718K。用Kissinger法得到了合金两步晶化过程的激活能分别为273和239kJ/mol。对该非晶薄带及其不同晶化程度的试样在0.01mol·L-1NaCl,pH=12碱性溶液中的室温电化学腐蚀性能的研究结果表明,部分晶化态试样表现出比非晶态试样更佳的耐蚀性能,而完全晶化态试样的耐蚀性能明显降低。

Al86Fe10Zr4 amorphous ribbons were prepared by melt spinning.The amorphous characteristics and crystallization behavior of the amorphous ribbons was investigated by means of X-ray diffraction（XRD） and differential scanning calorimetry（DSC）.The results show that the as-spun ribbons are in fully amorphous state.The DSC trace reveals that two-step crystallization occurs in the amorphous ribbon during the heating scanning,and the onset temperatures of the first and the second crystallization are about 603 and 718 K,respectively.The activation energies for the two-step crystallization are 273 and 239 kJ/mol,respectively.Furthermore,the effect of crystallization on the electrochemical properties was examined.The results indicate that the partially crystallized ribbon exhibits better corrosion resistance than that of the fully amorphous ribbon,while the fully crystallization deteriorates the corrosion resistance of the amorphous ribbon.