ฉันรักแปลfeedwater chemistry is critical and reliability of the fossil fired generating units. The effect of dissolved oxygen on corrosion of carbon steels in feedwater system is analyzed. The corrosion experiments of boiler tube steels supercritical water containing different dissolved oxygen are carried out. The different effect mechanics of dissoived oxygen on corrosion different parts of steam- water system are defined. Flow accelerated corrosion in low temperature feedwater system can be controlled by dissolved oxygen, but dissolved oxygen can accelerate failure of boiler tubes at high temperature from three aspects: corrosion rate, crack growth of SCC, and evaporating consumption rate chromium. Considering the corrosion of the whole steam-water system, a more effective feedwater chemistry treat- ment method is proposed.