Abstract
Characteristics of the oxide films formed on 304 stainless steel under different dissolved oxygen (DO) concentrations in 290°C water were investigated. Less hematite and more spinel oxides form on fresh sample as DO decreases. Meanwhile, relative Cr content in the film increases. Spinel develops on the film preformed under 3ppm DO when it was further immersed under DO below 5ppb while the preformed hematite degrades. The spinel preformed under DO below 5ppb still grows up when further immersed under 3ppm DO while the base layer becomes more porous due to dissolution of Cr.
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