Study of the accelerated corrosion of carbon steel in air-solution alternating environment, 2; Iron rust structure and the acceleration mechanism

Otani, Kyohei; Tsukada, Takashi; Ueno, Fumiyoshi; Yamamoto, Masahiro

no journal, , 

It has been reported that the corrosion rate of carbon steel in air-solution alternating environment, however, the mechanism of the accelerated corrosion of carbon steel in the alternating environment has not been clarified. In the present study, the mechanism of accelerated corrosion of carbon steel in the alternating condition is investigated by the cross-sectional observation and analysis for rust layer formed on the steel after the corrosion tests. The observation and analysis showed that the multi-layered rust layer was formed on the steel in the alternating environment, and the multi-layer rust layer accelerated the cathodic reaction. This acceleration of the cathodic reaction is the reason why the corrosion rate of carbon steel was accelerated in air-solution alternating environment.