Effects of alloy composition of carbon steel on the flow accelerated corrosion and oxide film properties in neutral water condition

Sato, Tomonori  ; Ugachi, Hirokazu ; Tsukada, Takashi ; Uchida, Shunsuke

In order to improve a theoretical prediction of flow accelerated corrosion (FAC), the individual effects of parameters which are water chemistry, material and flow dynamics should be understood. In this study, to determine the effects of minor alloying elements of carbon steel on FAC, corrosion rate of the specimens of carbon steel with various concentrations of minor alloying elements were measured. And the oxide films were examined by surface analyses techniques, e.g. Raman spectroscopy. Obtained effects of contents of Cr, Ni and Cu in carbon steel on FAC behavior are as follows; (1) FAC was suppressed for the carbon steel with more than 0.03% of Cr content. (2) FAC rate decreased as Ni content increased. (3) The hematite rich oxide was observed for Ni added carbon steel, while only magnetite was observed for Cr added one. (4) The clear effects of Cu on FAC rate was not observed.