The basic experiment on the high-temperature chemical reaction between sodium compound and iron-base material; Part 2 Structure observations

not registered ; Yoshida, Eiichi; Furukawa, Tomohiro  ; Aoto, Kazumi 

This experiment is carried out in the series of the investigation on the damage mechanism of carbon steel. In this paper, the damage situation is considered by structure observations. The test were carried out in 600C-1200C temperature range, in blowing an argon gas. The reagents are NaO, NaO and NaOH. From structure observations, the holes are observed on the surface of iron-base material in some test conditions. This result is indicated that the selective reaction occurs. The selective reaction is more obvious as the time exposed to the high temperature is longer. It is considered that the selective reaction occurs after the chemical reaction between iron-base material and sodium compound. The areas, in which Mn-concentration is higher, are observed in products on the surface of specimen.