In Situ Raman Spectroscopic Investigation of Nickel Hydrothermal Corrosion
In Situ Raman Spectroscopic Investigation of Nickel Hydrothermal Corrosion
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DOI：
10.5006/1.3279873
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发表时间：
2002-03
期刊：
影响因子：
1.6
通讯作者：
J. Maslar;W. Hurst;W. Bowers;J. Hendricks;M. I. Aquino
中科院分区：
文献类型：
--
作者：
J. Maslar;W. Hurst;W. Bowers;J. Hendricks;M. I. Aquino
摘要将镍试样暴露于压力为25. 4 MPa、温度为21°C至460°C的空气饱和水中，置于光学可接近的流动池中。随着试样被加热然后冷却，在许多温度下收集原位拉曼光谱。该试样还进行了表征非原位与拉曼光谱，扫描电子显微镜，能量色散X-射线光谱，和X-射线衍射。在加热过程中，在>249°C的温度下，以及在冷却过程中的所有条件下，原位观察腐蚀物质。这些物质被鉴定为一氧化镍（NiO）和α-氧化铬（III）氢氧化物（α-CrOOH）。α-CrOOH来源于从光学元件和/或流动系统释放的腐蚀产物。NiO拉曼特征在冷却期间比在加热期间的相应温度下更强烈，表明NiO以更大量存在和/或在冷却期间更结晶。
Abstract A nickel coupon was exposed to air-saturated water at a pressure of 25.4 MPa and temperatures ranging from 21°C to 460°C in an optically accessible flow cell. In situ Raman spectra were collected at a number of temperatures as the coupon was heated and then cooled. The coupon also was characterized ex situ with Raman spectroscopy, scanning electron microscopy, energy dispersive x-ray spectrometry, and x-ray diffraction. Corrosion species were observed in situ at temperatures >249°C during heating and under all conditions during cooling. The species were identified as nickel monoxide (NiO) and alpha chromium (III) oxide hydroxide (α-CrOOH). The α-CrOOH originated as a corrosion product released from the optical cell and/or flow system. The NiO Raman features were more intense during cooling than at the corresponding temperatures during heating, indicating that NiO was present in greater amounts and/or was more crystalline during cooling.