Study on the Current Fluctuations during the Early Stage of Pitting Corrosion

摘要

Electrochemical noises are observed during the early stage of pitting corrosion in many metal/solution systems. Generally the electrochemical noises are considered as the results of early stage of pitting corrosion, or metastable pitting, and reflect the nucleation, growth and repassivation of metastable pits on materials surface. Hence the electrochemical noises are closely related to the stable pitting corrosion and may provide information not only on the mechanism of early stage of pitting but on the prediction of pitting tendency in the system. In this paper, the current fluctuations of stainless steels, carbon steels and pure iron during metastable pitting in chloride containing solutions were analyzed and the purpose of the work was to find the relationships between the metastable pitting parameters and stable pitting tendency.