Abstract
Carbon steels are widely used as structural material for infrastructures due to their superior mechanical properties such as strength and toughness. However, infrastructures made of steels suffer from degradation due to atmospheric corrosion when they are used in atmospheric environments. It is well-known that rust layers formed on steel in atmospheric environments mainly consist of alpha-, beta-, and gamma-FeOOH and Fe3O4. Among the constituents of rust layers, alpha-FeOOH has been reported to be electrochemically stable compared to the other types of FeOOH and Fe3O4, suppressing atmospheric corrosion. Weathering steels exhibit superior atmospheric corrosion resistance compared to carbon steel due to enhanced growth of alpha-phase in rust layers. It has been reported that the growth of alpha-phase can be enhanced by alloying elements such as Cu and Cr in weathering steels. This implies that the introduction of such metallic cations into rust layers modifies their structure and protectiveness. In the preset work, we examine the effects of various metallic cations on the structure and protectiveness of rust layers on carbon steel.
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