Effect of Surface Roughness on Metastable Pitting of Amorphous Ni Alloy
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摘要: 用恒電位和動電位極化法研究了表面粗糙度對非晶態NiCrFeSiB合金亞穩態小孔形核和生長的影響,粗糙表面顯著促進亞穩態小孔的形核,在恒電位下,亞穩小孔的生長電流隨時間的平方線性增長為I-I0=k(t-t0)2.生長速度參數k和亞穩態小孔的峰值電流都服從對數正態分布。在粗糙表面上亞穩態小孔的生長速度略高,且分布范圍較大。Abstract: The effect of surface roughness on nucleation and growth of metastable pitting on amorphous NiCrFeSiB alloy was studied using potentiostatic and potentiodynamic polarization tests.Nucleation of metastable pits on the alloy was significantly facilitated by rougher surface. Both the growth rate parameters and the peak currents of metastable pits follow log-normal distribution. Rougher surface also promoted the growth of metastable pits, and lead to a wider distribution of the growth rates.
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Key words:
- pitting /
- current fluctuation /
- surface roughness /
- amorphous alloy
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