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Advances in Materials Science and Engineering
Volume 2018 (2018), Article ID 1027640, 6 pages
https://doi.org/10.1155/2018/1027640
Research Article

Corrosion Behavior of Alloy C-276 in Supercritical Water

1College of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
2College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
3School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China

Correspondence should be addressed to Yanxin Qiao

Received 19 June 2017; Revised 17 October 2017; Accepted 26 October 2017; Published 14 January 2018

Academic Editor: Alain Portavoce

Copyright © 2018 Hong Shi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The corrosion behavior of Alloy C-276 in high-temperature and high-pressure water at 500°C and 25 MPa, respectively, was investigated by means of mass gain, scanning electron microscopic observation, and X-ray diffraction. The results indicated that the mass gain rate of Alloy C-276 in supercritical water obeys the parabolic law. The oxide scale was formed on Alloy C-276 with a dual-layer structure, mainly consisting of an outer Ni-rich layer and an inner Cr2O3/NiCr2O4 mixed layer. Tiny microcracks can also be found in the oxide scale if exposed for longer time. Meanwhile, higher temperature promotes oxide rate and results in thermal stress in the oxide film.