Effect of oxygen concentration on the corrosion rate of carbon steel under air/solution alternating condition

Otani, Kyohei   ; Tsukada, Takashi ; Ueno, Fumiyoshi  ; Kato, Chiaki  

It was reported that the corrosion rate of carbon steel was accelerated under the air/solution alternating condition. In this presentation, it is investigated that the effect of oxygen concentration on the corrosion rate of steel under the air/solution alternating condition. As a result, the corrosion rate of carbon steel under the air/solution alternating condition did not increase linearly with increasing oxygen concentration in the air, and the slope in the low concentration range (0-5%) is greater than in the high concentration range (5-20.8%). This suggests that the corrosion rate may be accelerated around the air/solution interface on the inner surface of the PCV if even a small amount of oxygen is introduced into the PCV during the debris removal process.