The effects of surface finish on nucleation and growth of metastable pits on an amorphous Ni-Cr-Fe-Si-B alloy was studied using potentiostatic and potentiodynamic polarization tests. Nucleation of metastable pits on the amorphous alloy was facilitated significantly by a rougher surface. Both growth rate constants and peak currents of metastable pits followed a log-normal distribution. A rougher surface also promoted the growth of metastable pits and led to a wider distribution in growth rates.

Subject
Surface finishing, Pits, Electric current, Metal surfaces, Nickel based alloys, Nucleation, Roughness, Constants, Electric potential, Pitting, Electrochemical potential, Electrode potential, Inclusions
Keywords:
alloys, boron, chromium, iron, nickel, pitting, potentiostatic polarization, potentiodynamic polarization, silicon, surface finish
NACE International
1998
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