Influence of alloying on the passive behavior of steels in bicarbonate medium

摘要

The electrochemical behavior of passive films on carbon steel, chromium steel and high speed steel (HSS) was studied in 0.5 M NaHCO_3. The influence of the presence of 10 mM potassium chloride on passive film stability, and of the heat treatment of chromium steel and HSS on the respective film properties, was also investigated. Polarization curves showed that The alloy composition exerts a significant influence on the onset of passive film formation, Chromium and HSSs passivating more easily as a result of the higher alloying content.