Abstract
General structural components are widely made of Fe-Cu-C sintered steels. However, corrosion behavior of these components was not clear, as there are lots of factors to determine corrosion speed. Therefore the influence of (1) purity for sintered steel of pure iron powders and (2) additives of different copper for sintered steels of Fe-Cu-C powders on their corrosion behavior was investigated by using electrochemical methods including electrochemcal impedance spectroscopy (EIS). New approaching ways are very useful to determine the mechanism of corrosion behavior more clearly for sintered steels of pure iron material and even Fe-Cu-C material that showed more complicated phenomena. Corrosion behavior of sintered steels of pure iron is correlated with density and that of Fe-Cu-C sintered steels is more complicated. Addition of copper and carbon accelerates cathodic reaction, but depolarization of anode reaction dominates corrosion speed among Fe-Cu-C materials.
