In Situ Raman Spectroscopic Investigation of Nickel Hydrothermal Corrosion

Published

March 1, 2002

Author(s)

James E. Maslar, Wilbur S. Hurst, Walter J. Bowers Jr., Jay H. Hendricks, M I. Aquino

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 above 249 C during heating and under all conditions during cooling. The species were identified as NiO and α-CrOOH. The α-CrOOH originated as a corrosion product released from the optical cell and/or flow system. The NiO Raman features are more intense during cooling than at the corresponding temperatures during heating, indicating that NiO is present in greater amounts and/or is more crystalline during cooling.

Citation

Corrosion

Volume

58

Issue

No. 3

Pub Type

Journals

Keywords

aqueous corrosion, corrosion product release, hydrothermal oxidation, in situ optical spectroscopy, nickel, nickel oxide, Raman spectroscopy

Citation

Maslar, J. , Hurst, W. , Bowers, W. , Hendricks, J. and Aquino, M. (2002), In Situ Raman Spectroscopic Investigation of Nickel Hydrothermal Corrosion, Corrosion (Accessed December 13, 2024)