利用扫描隧道显微镜观察了大气条件下FeNiSiB非晶合金在自然大气环境下腐蚀前后表面的微观形貌特征,并对所获结果进行分析,以探讨非晶合金的微观结构与大气腐蚀行为的关系。结果表明:实验所用非晶材料的微观结构是由几个原子首先组成2纳米左右的颗粒团,此颗粒团经无序密堆,最后形成非晶合金。非晶合金结构具有自仿性,在微米、纳米尺度具有相同的分维数;在大气中非晶合金以2纳米左右的颗粒团为基本单元发生均匀腐蚀,且腐蚀前后非晶合金表面具有相同的分维数。
The morphology of FeNiSiB amorphous alloy before and after corrosion in the air has been studied by scanning tunneling microscopy. The morphology characteristics have been analyzed by the fractal method and the relationship between the structure and the corrosion behavior of the amorphous alloy has been discussed. The amorphous alloy used in the study has a unique structure. At first, several atoms form the grain about 2 nanometers in scale, and then, these grains pile up to form the bigger grains about 50 nanometres. These bigger grains mix together again to form the amorphous alloy. The fractal dimension of the amorphous alloy in micrometer and in nanometer scales is the same, and the fractal dimension is also the same before and after corrosion. General corrosion occurred on the amorphous alloy in air and the minor units participated in the corrosion are the grains about 2 nanometres in scale.
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