Abstract
In Japan, huge infrastructures such as bridges and pipelines have been built, especially since high economic growth period in 1960s. For such infrastructures, carbon steel has been extensively used due to the superior mechanical properties as well as low cost. However, as carbon steel easily corrodes in most atmospheric environments, various countermeasures against atmospheric corrosion have been proposed and carried out. It is well-known that atmospheric corrosion proceeds by repeated processes of the cathodic reaction of FeOOH to magnetite and the air oxidation of formed magnetite. The repeated processes enhance the cathodic reaction, accelerating an anodic dissolution of underlying steel. Therefore, suppressed reduction of FeOOH is expected to result in suppressed corrosion reaction on carbon steel. In our previous work, a simple immersion of rusted steels in metallic cation containing solutions was found to modify the structures of rusts on carbon steel, leading to drastic decrease in corrosion rate. The present work reports effects of metallic cations on reduction behavior of rusts grown on carbon steel.
Published Version
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