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首页> 美国政府科技报告 >Surface Spectroscopy of Pressure Vessel Steel Fatigue Fracture Surface Films Formed in PWR (Pressured Water Reactor) Environments.
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Surface Spectroscopy of Pressure Vessel Steel Fatigue Fracture Surface Films Formed in PWR (Pressured Water Reactor) Environments.

机译：pWR（压水反应堆）环境中压力容器钢疲劳断裂表面膜的表面光谱。

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The composition and structure of corrosion products formed on corrosion fatigue fracture surfaces of pressure vessel steels tested in PWR-water conditions have been analyzed by using X-Ray Photoelectron Spectroscopy (XPS) and Auger Electron Spectroscopy (AES) techniques. This was the first time these electron spectroscopic techniques have been applied to corrosion fatigue fracture surface studies. The oxide phase on the corrosion fatigue fracture surfaces was Fe3O4 (magnetite) in all the specimens. Small amounts of sulfur (typically about 3 atomic percent) were present in the oxide film mainly as FeS2. In specimens showing the highest crack growth rates, the amount of sulfur was about doubled near the crack tip as compared to the value obtained further behind the crack tip in the middle of the fracture surface. It was possible to locate the crack-tip condition on the high-temperature Pourbaix diagram in the area where both magnetite and FeS2 are stable phases. The anticipated crack-tip conditions are that the corrosion potential is about -500 mV(SHE) or less and the pH value is neutral or slightly acid. XPS and AES analyses of the corrosion fatigue fracture surfaces were found to reveal the possible water chemistry impurities during the corrosion fatigue tests, like Cl, Na, Ca, etc.

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